Download MCQ`S (PHYSICS)

(b) 42 oC
(c) 55 oC
(d) 410 oC
Heat
(1)
(2)
(3)
(4)
Dimension of pressure is.
(a) MLT
(b) ML-1T-1
(c) ML-1T-2
(d) ML-2T-2
Temperature is a property, which determines.
(a) How much heat a body contains
(b) Whether a body will feel hot or cold to
touch
(c) In which direction heat will flow
between two systems
(d) How much total absolute energy a body
has.
WE prefer mercury as a thermometric
substance because.
(a) Over a wide range of temperature is
expansion is uniform
(b) It does not stick to thermometer glass
(c) It is opaque to light
(d) All of above
The scales of temperature are based on two
fixed points, which are.
(a) The temperature of water at 0oC and
100oC.
(b) The temperature of melting ice and
boiling water at atmospheric pressure.
(c) The temperatures of ice cold and boiling
water
(d) The temperatures of frozen and boiling
mercury
(5)
Numerical value of Bolzmann’s constant is.
(a) 1.38x10-31JK-1
(b) 3.18x10-31JK-1
(c) 3.18x10-23JK-1
(d) 1.38x10-23JK-1
(6)
In a clinical thermometer, the mercury in the
capillary tube does not contract one removed
from the patient because.
(a) Mercury takes a long time to contract
(b) The amount of mercury use is very small
(c) The capillary tube has a small
constriction near the bulb
(d) The capillary tube is very narrow
Normal human body temperature 98.6oF
corresponds to.
(a) 37oC
(7)
(8)
The Fahrenheit and centigrade scales agree
to.
(a) -40
(b) 15.5
(c) 542
(d) -273
(9)
The size of one degree of Celsius is equal to.
(a) One degree of Fahrenheit scale
(b) 1.8 degrees of Fahrenheit scale
(c) 3.2 degrees of Fahrenheit scale
(d) 2.12 degrees of Fahrenheit scale
(10)
At constant temperature, the graph between
V and 1 / P is.
(a) Hyperbola
(b) Parabola
(c) A curve of any shape
(d) A straight line
(11)
According to Pascal’s law the pressure of gas
in a vessel is.
(a) Different in different direction
(b) Same in all direction
(c) Same only along opposite directions
(d) Same only along normal directions
(12)
We can produce heat by.
(a) Frictional process
(b) Chemical processes
(c) Electrical processes
(d) All of the above
(13)
Which one is true for internal energy?
(a) It is sum of all forms of energies
associated with molecules of a system.
(b) It is a state function of a system
(c) It is proportional to transnational K.E of
the molecules
(d) All are correct
(14)
Metabolism is the name of a process in which
energy transformation take place within.
(a) Heat engine
(b) Human body
(c) Atmosphere
(d) Laboratory
1
(15)
Which one is not an example of adiabatic
process?
(a) Rapid escape of air from a burst tyre
(b) Rapid expansion of air
(c) Conversion of water into ice in
refrigerator
(d) Cloud formation in the atmosphere
(16)
The pressure exerted by a column of mercury
76cm high and at 0oC is Called.
(a) 1 Atmosphere
(b) 1 Newton per square meter
(c) 1 Pascal
(d) date is insufficient
(17)
Standard condition (STP) refer to a gas at.
(a) 76cm, 0oC
(b) 760mm, 273K
(c) 1 atm, 273K
(d) all of the above
(18)
If the volume of a gas is held constant and we
increase its temperature then.
(a) its pressure is constant
(b) its pressure rises
(c) its pressure falls
(d) any of above
(19)
“If the pressure of a given gas is held
constant its density is inversely
proportional to its absolute temperature.” We
can refer it as another statement of.
(a) Boyle’s law
(b) Charle’s law
(c) Ideal gas law
(d) Avagadro’s law
(20)
Boyle’s law holds for ideal gases in.
(a) Isochoric processes
(b) Isobaric processes
(c) Isothermal processes
(d) Adiabatic processes
(21)
Gas molecules of different masses in the
same container have the same average
transnational kinetic energy, which is
directly proportional to
(a) Volume
(b) Pressure
(c) Absolute temperature
(d) Time
(22)
(a)
(b)
(c)
(d)
CP +CV= γ
CP = 1+R/Cv
γ = CP/CV
CP = 1-R/CV
(23)
The reading on the Fahrenheit scale will be
double the reading on the centrigrade
scale when the temperature on the
centigrade scale is.
(a) 460oC
(b) 280 oC
(c) 360 oC
(d) 160 oC
(24)
The area inclosed by the curve ABCDA for a
Carnot heat engine represents the work done
by Carnot engine.
(a) At any instant
(b) Averagely
(c) During its operation
(d) During one cycle
(25)
For a gas obeying Boyle’s law, if the pressure
is doubled, the volume Becomes.
(a) Double
(b) One half
(c) Four time
(d) One fourth
(26)
Triple point of water is.
(a) 273 oC
(b) 273K
(c) 273.16 oC
(d) 273.16 K
(27)
Which of the following properties of
molecules of gas is same for all gases
at particular temperature?
(a) Momentum
(b) Mass
(c) Velocity
(d) Kinetic energy
(28)
Boltzmann constant K in terms of universal
gas constant R and Avagadro’s number Na is
given as,
(a) K = RNa
(b) K = R/Na
(c) K = Na/Ra
(d) K = nRNa
Which one is correct relation?
2
(29)
(30)
Average translational kinetic energy per
molecule of an ideal gas is given by
(a) 3NaT/2 R
(b) 2NaT/3
(c) 3RT/2Na
(d) 3Na/2RT
In which process entropy remains constant.
(a) Isobaric
(b) Isochoric
(c) Adiabatic
(d) Isothermal
(31)
The expression for the absolute temperature
T of an ideal gas is given by
(c) isobaric
(37)
(a) isothermal
(c) adiabatic
(b) isobaric
(d) isochoric
(39)
The efficiency of a Carnot engine between
HTR at T1 and LTR at T2 is given by:
T1
T2
T  T2
(c) 1
T1
(a) 1 -
T2  T1
T1
T1
(d)
T1  T2
(b)
(40)
The property of a system that remains
constant during an adiabatic process is called
(a) internal energy
(b) entropy
(c) temperature
(d) pressure
(32)
The amount of heat required raising the temp.
of 1 kg of a substance through 1 K is called
(a) specific heat
(c) calorie
In an adiabatic process
(a) ΔQ = ΔU
(b) ΔQ = ΔW
(c) ΔQ = 0
(d) ΔQ = ΔU - ΔW
(38)
In thermodynamic process, ΔQ = ΔU. The
process is
2
(a) T = 3/2 k <1/2 m v >
N
(b) T = 2/3 A <1/2 m v2>
R
m
 v2 
(c) T=
3k
2 NAR
(d)
3T
(d) isochoric
(b) heat capacity
(d) Joule
ANSWER
1 C 2 C 3 D 4 B 5 D 6 C 7 A 8 A 9 B 10 D
(33)
Specific heats of a gas at const. pressure and
at const. volume are respectively Cp and Cv>
11 B 12 D 13 D 14 B 15 C 16 A 17 D 18 B 19 B 20 C
(a) Cp < Cv
(c) Cp = Cv
21 C 22 C 23 D 24 D 25 B 26 C 27 D 28 B 29 C 30 C
(b) Cp > Cv
(d) none of these
31 C 32 A 33 B 34 A 35 A 36 C 37 C 38 D 39 C 40 B
(34)
equal to
The ratio Cp/Cv = γ for a monoatomic gas is
(a) 1.67
(c) 1.29
CHAPTER # 12
ELECTRO STATIC
(b) 1.40
(d) 1.11
1.
(35)
The first law of thermodynamics is an
expression of
(a) the conservation of energy including
heat
(b) Conservation of mass
(c) heat death of the universe
a) 5 X 109 dyn
c) 9 x 109 dyn
2.
The process in which the pressure of the
system remains constant is called
(a) adiabatic
(b) isothermal
3.
b) 5 x 109 N
d) 9 x 109 N
The minimum charge on an abject is
a) 1 coulomb
c) 1.6 x 10-19
(d) degradation of energy
(36)
One coulomb is that unit of charge which when
placed at 1m form an equal and similar charge
repels it with a force
b) 1 state coulomb
d) None
Which of the following is correct
a) J = C/V
b) J = V x A
3
c) J = V/A
4.
b) Insulators
d) S. conductors
b) J.J. Thomson
d) Einstein
16.
17.
b) Blue
d) Tonar
10.
b) 5 N
d) 0.3 N
19.
In the region where the electric field is zero, the
electric potential is always
a) Positive
b) Negative
c) Constant d) Zero
20.
The electric intensity is expressed in unit of N/C
or
a) Volts
b) Walt
c) Joules
d) V/m
21.
The energy stored in the capacitor is
b) N/C
d) N2/C2
a) ½ CV2
c) ½ QV2
22.
b) Curved surface
d) Closed surface
b) ½ C2 V
d) ½ Q2V
23.
b) Heating
d) By rubbing
Coulomb’s law is only applicable for
A charge of 0.01c accelerated through a p.d of
1000v acquires K-E
a) 10 J
c) 200 J
Objects may acquire an excess or deficiency of
charge by
a) Electric force
c) Striking
14.
Depends on the path taken
Greater then zero
Equal to zero
Negative
Gauss’s law can be applied to
a) Plane surface
c) Any surface
13.
The work done in moving a charge along an
equipotential surface is
Unit of electric flux is
a) V.m
c) V.m2
12.
b) Direction
d) All of them
b) Electric flux
d) None
A basic technique when applying gauss’s law is
to
a.
b.
c.
d.
If two charges are experiencing a force of 10 N,
when medium is Air, if the medium is change
whose permittivity is ‘2’ then force will be
a) 3 N
c) 10 N
11.
b) 1:6
d) 6:1
An electric field lines provides information
about ________
a) Electric Force
c) Medium
Electric field intensity is also known as
a. Assume the field is constant in direction
b. Assume the field is constant is magnitude
c. Assume the field is constant in both
magnitude and direction
d. Construct and imaginary surface
about the charge
18.
9.
The force per unit charge is known as
a) Electric potential
c) Potential gradient
There are two charges 1 uc and 6 uc, the ratio
of forces acting on them will be
a) 1:25
c) 1:1
b) Small charges
d) Any charges
a) Electric flux
b) Electric potential
c) Electric intensity d) Electric current
The ink used in the photocopy machine
a) Black
c) Red
8.
15.
The charge on the electron was calculated by
a) Faraday
c) Millikon
7.
b) 4.8 x 10-10 ergs
d) None
Polarization of matter is possible only for
a) Conductors
c) Gases
6.
a) Big charges
c) Point charges
One electron volt is
a) 1.6 x 10-12 ergs
c) 300 ergs
5.
d) J = C x V
b) 100 J
d) 400 eV
If the charge on the particle is double then
electric field is
a) Half
c) Unchanged
b) Double
d) None
4
34.
24.
The electric potential at a point of distance 1 m
from 2 uc charge is
a) 1.8 x 106 V
c) 1.8 x 104 V
a) Polarization
c) Insulators
b) 1.8 x 106 N/C
d) 1.8 x 105 V
35.
25.
The area of plates of 1 farad capacitor
separated 8.85mm placed in the air is
a) 109m2
c) 10-9m2
The equation for the stokes law is
a) 6 
b) 6 
c) 6 rv
d) 8 
38.
29.
a) Electrostatic
c) Electro magnetism
30.
31.
b) 109 ev
d) 1015 ev
41.
Gravitational force does not depends on
a) Force
c) Distance
33.
S.I unit of permittivity of free space is
b) Weber
d) c2/N.m
A capacitors may be considered as a device for
a.
b.
c.
d.
b) Spherical surface
d) None
b) 4:1
d) 1:2
Storing energy
Increasing resistance
Decreasing resistance
None
One giga electron volt
a) 106 ev
c) 1012 ev
32.
40.
b) Decrease
d) None
When two capacitors of same capacitance are
connected in parallel and then in service, the
capacitance in these two cases are in ratio of
a) Farad
c) c2/N.m2
b) Electro dynamics
d) Electronics
The surface consider for gauss’s law is called
a) Closed surface
c) Gaussian surface
39.
b) Dark
d) None of these
When capacitors are connected in parallel the
net capacitance will
a) 1:4
c) 6:1
b) D.C
d) None
Inkjet printers works on the principle of
Selenium is a conductor material which when
exposed to ________
a) Increase
c) Constant
A capacitor acts as blocking elements when
applied signal is
a) A.C
c) Digital
Electricity
Cell
Charging and discharging of capacitor
None
a) Light
c) Mono chromatic light
b) 05m2
d) 10-15m2
37.
28.
The automobiles wind shield wipers works on
a.
b.
c.
d.
Size of plate
Distance b/w plates
Nature of dielectric b/w plates
All of above
36.
27.
b) Dielectric
d) Medium
Capacity of a capacitor depends upon
a.
b.
c.
d.
26.
The medium used b/w the plates of capacitor is
called
b) Masses
d) Medium
Charge to mass ratio was firsts found by
a) Millikon
c) Newton
b) J.J. Thomson
d) None
If a 10MF and 2000MF capacitors are
connected in parallel the net capacitance will
be
a) 6.7 uF
c) 2010 uF
42.
b) 1990 uF
d) None
A method for charging a conductor without
bringing a charge body in contact with it is
called
a. Magnetization
b. Electrification
c. Electrostatic induction
5
d. Electromagnetic induction
51.
43.
a) Zero
c) E = kq/r2
44.
A dielectric
An equipotential surface
Polarized
None
The electric flux through the surface of hollow
sphere containing a point charge at its center
depends upon
a.
b.
c.
d.
47.
One joule per coulomb
One dyne per coulomb
One Newton per coulomb
One watt per second
If the potential difference on a surface is equal
to zero b/w any two points, then surface is said
to be
a.
b.
c.
d.
46.
Radius of sphere
Surface area
Magnitude of charge
None of these
b) 4 N
d) 0 N
b. 2.4 × 10-6C
d. 2.4 × 10-6C
53. An electric field can deflect
a. Neutron
c.  – rays
54. The relative permittivity
a. 16
c. 18
55.
b. x – rays
d. α – rays
 r for germanium is
b. 17
d. 22
Xerography means
a. Type writing
c. Dry writing
b. Wet writing
d. None of these
56. A 25eV electron has a speed of
a. 2 × 106m/sec
c. 5 × 106m/sec
57.
b. 3 × 106m/sec
d. 4 × 106m/sec
If mica sheet is place between the plates,
the capacity will
a. Increase
c. Remain same
b. Decrease
d. None of these
b) Electric force
d) Potential field
A unit of electric charge is
a) Volt
c) Ampere
50.
a. 2.5 × 10 -5C
c. 2.4 × 10-5C
A line whose tangent at each point is in the
direction of electric intensity at that point is
called a line of
a) Voltage
c) Charge
49.
52. A Capacitor of 2μF is connected with a
battery of 12 Volts, the charge stored in
capacitor
A charge of 2c is in a field of intensity 2N/C, the
force on the charge is
a) 1 N
c) 4  N
48.
a. Small time constant
b. Large time constant
c. Equal time constant
d. None of these
b) Greater than zero
d) Infinite
One volt is
a.
b.
c.
d.
45.
Large CR (Time constant) value has
The field inside the hollow conductor will be
b) Hennery
d) Coulomb
58.
Potential gradient is defined as
E
V
r
c.
V
a.
E
V
V
d. 
r
The force exerted by two charged bodies
on one another, obeys Coulomb’s law
provided that
a. The charges are not too small
b. The charges are in vaccum
c. The charges are not too large
d. The linear dimension of charges are much
smaller than distance between them
b. 
59.
Coulomb Law is also known as
6
a. Electrostatic Law
c. Inverse Square Law
a) 2N
c) 6N
b. Force Law
d. None
68.
60.
r
1
c.

c)
R 2 / E
2R 2 / E
70.
qvd
m
mgd
c) g 
v
72.
d) 2R E
2
In an inkjet printer the charged ink drops are
diverted by the deflection plates
73.
a) Towards the charging electrodes
b) Towards the gutter
c) Towards a blank paper on which the print is to
be taken
d) In inkjet printer ink can not be charged
65.
a) Nature of medium
c) Intensity of charge
66.
c)
74.
b) 6.2 × 10-21
d) Zero
The force between two charges in 8N. now
placed a mica of relatively 4 between two
charges as a medium, the force then reduced to



 r
75.
b) 1038
d) 1042
b)
d)

2 

2  r
b) Field
d) Potential Difference
Dielectric has the charge of the type inside it
a) Moving charge
c) Both a & b
76.
d) None
Of the following quantities, the one that is vector
in character is an electric
a) Charge
c) Energy
How many electrons are in one Coulomb?
a) 6.2 × 10-23
c) 1.6 × 10-19
67.
b) System of units
d) a & b
qvd
g
The magnitude of the electric field on the surface
of a sphere of radius ‘r’ having a uniform surface
charge density  is
a)
The constant K in Coulomb’s Law depends upon
b) q 
The ratio of electrostatic force to the gravitational
force between them is of the order of
a) 1036
c) 1040
b) Zero
b) Electron
d) Neutron
The charge determined by the Milikan’s
experiment is
a) q 
b) 1.6 × 109N
d) 1.6 × 1013N
b) 1.9KV
d) 0.15KV
In Milikan’s experiment, we find the e/m for
a) Atom
c) Proton
71.
b) Conductor
d) Photoconductor
Find the potential at a point, where a charge of
1 × 10-3 coulomb is placed at a distance of 10m is
a) 1mV
c) 1.6KV
b) 1 : K
d) 1 : K2
A cylinder of radius R and length L is placed in a
uniform electric field E parallel to the cylindrical
axis. The total flux for the surface of the cylinder
is:
a)
64.
69.
The force of proton in electric field of magnitude
106 N/c is
a) 1.6 × 10-15N
c) 1.6 × 1013N
63.
a) Insulator
c) Semiconductor
1
b.
r
1
d.
o
The ratio of the force between two small spheres
with constant charges A) in air, B) in a medium
of dielectric constant K is
a) K2 : 1
c) K : 1
62.
Selenium is an
The ratio of Cvac and Cmed is equal to
a.
61.
b) 4N
d) 8N
b) Static charge
d) None of these
The Coulomb’s force between two charges q1
and q2 separated by distance ‘r’ is F. If the
separation between two charges is doubled
7
keeping charges constant, then Coulomb’s force
becomes
c) Half
d) Four time
2) The expression for the co-efficient of receptivity is
a) 4F
c) F/2
b) F/4
d) 2F
R2  R1
R2 
R2  R1
d.
R
R
Ro 
R1  R2
c.
R1 
a.
77.
The dimensions of relative permittivity are
a) [A2T4ML-3]
c) [ML3A2T2]
78.
An alpha particle has twice the charge of a
proton. Two protons separated by a distance ‘d’
exert a force ‘F’ on each other. What must be the
separation between the alpha particles so that
they also exert a force ‘F’ on each other?
a) 2d
c)
79.
b) [ML-3A2T4]
d) None
b)
2d
d)
d
2
d
2
The ratio of instantaneous charge and maximum
charge on plates of capacitors at t = RC is
a) 36.8%
c) 20%
b) 63.2%
d) 30%
b.
3) The reciprocal of resistivity is called
a)
b)
c)
d)
Resistance
Conduction
Conductivity
None
4) One coulomb per second is equal to
a)
b)
c)
d)
Joule
Volt
Ampere
Walt
5) In the metallic conductor the current is due to flow
of charge
a)
b)
c)
d)
Positive
Negative
Proton
None
6) Conventional current flow from
a)
b)
c)
d)
Positive to negative
Negative to positive
Negative to negative
None
7) The main source for the current are
a) Two
b) Three
c) Four
d) Five
8) The drift velocity of electron at 0oC is
CHAPTER # 13
CURRENT ELECTRICITY
1) If the length and diameter of conductor is double, the
resistance is
a) Remain same
b) Double
a)
b)
c)
d)
zero
Maximum
1 cm/sec
10 cm/sec
9) In the thermocouple the heat energy is converted
into
a) Mechanical energy
b) Electric energy
c) Magnetic energy
8
d) None
c) Minimum
d) None
10) An electric heater 220V, 440W has a resistance
a)
b)
c)
d)
2Ω
110 Ω
0.5 Ω
20 Ω
18) A current of 10A flows in a conductors of 10 Ω
resistance for 1 mint the heat produce will be
a)
b)
c)
d)
11) The heating effect of current utilized in
a)
b)
c)
d)
Iron
Tube light
Fan
Motor
12) Mathematical form of ohm’s law is
a)
b)
c)
d)
I = VR
I = V/R
I = R/V
R = IV
19) The unit of conductivity is
a.
b.
c.
d.
Conductors
Transistors
Diodes
Electric Areas
14) Through an electrolyte electric current is passed
due to drift of
a.
b.
c.
d.
Free electrons
Positive and negative ions
Free electrons and holes
Protons
15) The e.m.f. of two cells can be compared by
a.
b.
c.
d.
AVO meter
Voltmeter
Potentiometer
Galvanometer
16) The post office box is based on the principle of
a.
b.
c.
d.
Galvanometer
Wheat-stone bridge
Voltmeter
None
17) At null point the current through the galvanometer
is
a) Zero
b) Maximum
Ω. M
(η.m)-1
Ω.m-1
None
20) When the bulb is turned on, ohm’s law is
applicable
a)
b)
c)
d)
13) Ohm’s law is valid for only current flowing in
a)
b)
c)
d)
102 J
6 x 102 J
6 x 103 J
6 x 104 J
Yes
No
May or may not
None
21) In series circuit the net resistance is
a.
b.
c.
d.
Increase
Decrease
Remain constant
None
22) Joule law can be expressed as
a)
b)
c)
d)
I2 Rt
IR2t
IRt2
V2/R
23) The graph b/w V and I in case of ohm law is
a)
b)
c)
d)
Parabolic
Curve
Slope
Straight line
24) Resistance of supper conductor is
a)
b)
c)
d)
Finite
Infinite
Zero
Changes with material
25) The e.m.f. of a cell or battery is the voltage b/w its
terminals, when
a. It is closed circuit
9
b. It is open circuit
c. Its internal resistance is zero
d. None
26) The S.I unit of e.m.f. is same as
a.
b.
c.
d.
Work
Energy
Power
Voltage
27) The main type of resistors are
a.
b.
c.
d.
Two
Three
Four
Five
28) In the carbon resistor their value can be find by
their
a.
b.
c.
d.
Wires
Terminals
Color
Spots
29) The third band is written in the form of power of
a.
b.
c.
d.
2
6
8
10
b. Rheostat
c. Amplifier
d. None
34) A heat sensitive resistor is called
a.
b.
c.
d.
Amplifier
Diode
Thermistor
Conductor
35) The temperature co-efficient of thermistor is
a.
b.
c.
d.
Positive
Negative
Zero
None
36) Thermistor can be used for the accurate
measurement of
a.
b.
c.
d.
Voltage
Resistance
Temperature
Heat
37) A circuit which has only one voltage source is
called
a.
b.
c.
d.
Network
Simple circuit
Complex circuit
None
30) Tolerance color means
a.
b.
c.
d.
Greater
Less
Greater-less
None
31) If the first color red and 2nd band is green and
third band is orange, then value of resistance is
a.
b.
c.
d.
20000
24000
25000
None
32) If the tolerance color is gold then it value is
a.
b.
c.
d.
± 2%
± 4%
± 5%
± 6%
38) The circuit who has more than one voltage source
is called
a.
b.
c.
d.
Network
Simple circuit
Complex circuit
None
39) The algebraic sum of all the current at junction is
zero, is Kirchoff’s
a. 1st law
b. 2nd law
c. 3rd law
d. 4th law
40) The algebraic sum of voltages changes around a
closed circuit or loop is zero, is Kirchoff’s
a.
b.
c.
d.
1st law
2nd law
3rd law
4th law
33) A variable resistors is called
a. Resistance
41) If the resistance of a certain length wire, diameter
5mm is 10Ω if the diameter is charge to 10mm,
10
then new resistance is
a.
b.
c.
d.
a.
b.
c.
d.
40
5
20
2.5
49) Kirchoff’s 1st law is also called law of conservation
of
42) The unit for the consumption of electrical energy
commonly used is
a.
b.
c.
d.
Resistively
Conductivity
Temperature co-efficient
None
a.
b.
c.
d.
Joule
Watt sec
K. watt. hr
Watt. hr
50.
Charge
Mass
Energy
None
The resistivity of copper in Ω.m is
43) Heat generated by 40 watt bulb is one hour is
a.
b.
c.
d.
24000 J
48000 J
144000 J
14400 J
a. 1.52 × 10-8
c. 1.56 × 10-8
51.
P.d  length
P.d  resistance
P.d.  area
None
45) A fuse is placed in series with circuit to protect
against
a.
b.
c.
d.
High power
High voltage
High current
Over heating
52.
53.
54.
b. Voltage
d. None of these
Open electric transmission lines
If three resistances of equal resistance R are
connected in parallel, the net resistance will
a. 3R
Positive
Negative
Zero
None
c.
55.
Electro late
Electrolysis
Electro-conductor
None
An ideal voltmeter would have an infinite
a. Obey Ohm’s law
b. Obey at high temperature
c. Do not obey Ohm’s law
d. None of these
47) When electricity passes through the liquid then
process is called
a.
b.
c.
d.
b. Nichrome
d. Tungston
a. Current
c. Resistance
46) If the resistor is traversed apposite to the direction
of current, then potential is
a.
b.
c.
d.
The wire used in Rheostate is made from
a. Constanton
c. Manganin
44) The principle of potentiometer
a.
b.
c.
d.
b. 1.54 × 10-8
d. None
3
R
b.
R
3
d. R + 3
The fractional change in resistivity per Kelvin
a. co-efficient in resistance
b. co-efficient of resistivity
c. Resistance
d. None
56.
An electric bulb rated at 220V 140watt is
connected to 110v power line, the current that
flows in it is
a. 1.27 A
c. 2.27 A
b. 1.83 A
d. 2.83 A
48) Which one gives pure nature of the material
11
57.
Which one is non-ohmic?
65.
a. Diode
c. Copper wire
58.
b. Carbon resistance
d. Tungston wire
a) Nature
c) Physical state
66.
R
E
r
l
c. E x  E
L
61.
62.
d. E x 
L
l
R
lE
r
4
b. Ohm
3
c. 4 × 3 Ohm
d. 4 + 3 Ohm
The resistivity of a material is  . If the area of
cross-section of material is doubled and length is
halved then the resistivity of material is:
b) 4 
d)  / 4
b) 20W
d) 40W
A source of 200V provides a current of 10.0
Amperes to a house. The power delivered by the
source is
68.
 of Aluminium in Ωm is
69.
b) 0.5 × 10-8
d) None of these
The colour code for the colour Grey is
a) 7
c) 9
70.
b) 2.60 × 10-8
d) None of these
The resistivity of Germanium in Ωm is
a) 0.7 × 10-8
c) 0.59 × 10-8
b) 8
d) 5
A zero ohm resistor is indicated by
a) A single silver colour band
b) A single black band
c) A silver black band
d) None of these
71.
Thermo couples convert heat energy into
a) Mechanical energy
c) Electrical energy
72.
73.
b) 40 watt
d) 200 watt
R
E
r
l
c) E x  E
L
74.
b) An ammeter
d) All of them
The unknown emf can be determined and given
by
a) E x 
b) Every point
d) All of them
b) Chemical energy
d) None of these
An accurate measurement of emf of a cell is
made by
a) A voltmeter
c) A potentiometer
When the battery is connected at its ends, an
electric field is set up at
a) Its ends
c) Middle
The resistivity
a) 2.59 × 10-8
c) 2.63 × 10-8
Four bulbs of 10W, 20W, 30W and 40W are
connected in parallel, the bulb that will shine
more is
a) 20 watt
c) 2000 watt
64.
b. E x  E
3
a. Ohm
4
a) 10W
c) 30W
63.
67.
Three two ohm resistors are connected to
form a triangle. The resistance b/w any two
corner is
a) 
c) 2 
Conductance is a quantity used to describe the
a) Physical state of the conductor
b) Electrical properties of material
c) Dimension of the conductor
d) All of them
The unknown e.m.f can be
determined by
a. E x 
60
b) Dimension
d) All of them
Magnetic effect of current is utilized in
a. Iron
b. Thermocouple
c. Measurement of current
d. None
59.
The value of resistance depends upon
b) E x  E
d) E x 
L
l
R
lE
r
Do bends in a wire affect its electrical resistance
a) Yes
b) No
12
c) Affects a little
75.
d) None of these
A 50 volt battery is connected across a 10 ohm
resistor. The current is 4.5A. The internal
resistance of the battery is:
a) 1.1 Ω
c) 1.3 Ω
76.
d. None
4.
a.
b.
c.
d.
b) 1.2 Ω
d) 1.4 Ω
A 25 watt and 40 watts bulbs were connected an
a series to a 220V line. Which electric bulb will
grow more brightly?
5.
A 100 watt bulb and a 200 watt bulb are designed
to operate at 110V and 220V respectively. The
ratio of their resistance is
1
2
1
d)
4
a) 1
c)
6.
1
3
7.
1.
8.

when charge particle enter perpendicular to
magnetic field, the path followed by it is
a.
b.
c.
d.
Iron
Steel
Moving charge
None of these
9.
A helix
A circle
Straight line
Ellipse
The S.I. unit of magnetic flux is
The poles of magnet are similar to
a.
b.
c.
d.
a. Geo poles
b. Opposite to geo poles
c. Perpendicular to geo poles
d. None
10.
3.
Max
Min
Zero
None
The origin of magnetism is
a.
b.
c.
d.
2.
Stationary charges
Moving charges
Stationary and moving charge
Law of motion
if the angle b/w v and B is zero then
magnetic force will be
a.
b.
c.
d.
CHAPTER # 14
ELECTROMAGNETISM
Diamagnetic
Paramagnetic
Ferromagnetic
Non-magnetic
Magnetism is related to
a.
b.
c.
d.
b)
North pole
South pole
Are ionized
None
Iron is what type of magnetic material, it is
a.
b.
c.
d.
a) 25 watts bulb
b) Neither will give light
c) Both will have same incandescence
d) none
77.
A photon while passing though a magnetic
field are deflected towards
Tesla
Weber
Joule
Newton
Tesla is the unit of
A moving charge is surrounded by
a. 2 fields
b. 3 fields
c. 4 fields
a.
b.
c.
d.
Electric field
Magnetic field
Magnetic field intensity
Electric field intensity
13
11.
a.
b.
c.
d.
12.
a.
b.
c.
d.
It is possible to set a charge at rest into
motion with magnetic field
Yes
No
Some Time
None
18.
19.
a.
b.
c.
d.
13.
Away from you
Towards you
Clock wise
Anti clockwise
20.
14.
Electrical
Squire
Varies with current
Circular
104G
10-4G
106G
10-6G
The flux through an area of 1 m2 in x -y plane
in a magnetic filed of 1T directed along Z axis will be
a.
b.
c.
d.
N.A2/A
N.m2/A
N.A/m
N.m/A
22.
23.
CRO
Diode
Transistor
Radio
The force on a charge particle moving
parallel to magnetic field is
a.
b.
c.
d.
24.
1 x 10-6N
6.4 x 10-17N
3.6 x 10-24N
4 x 106N
The waveform of sinusoidal voltage, its
frequency and phase can be found by
a.
b.
c.
d.
No, of tarns
Current and magnetic field
Area of coil
All of above
A current carrying loop, when placed in a
uniform magnetic field will experience
An electron moves at 2x102m/sec
perpendicular to magnetic field of 2T what is
the magnitude of magnetic force
a.
b.
c.
d.
Zero
1 wb
0.5 web
None
The toque in the coil can be increased by
increasing
a.
b.
c.
d.
17.
One weber is equal to
a.
b.
c.
d.
21.
16.
Conductance
Electric current
Magnetic flux
Electric flux
one Tesla is equal to
a.
b.
c.
d.
15.
0o
60o
90o
180o
The Weber and Maxwell are unit of measure
of
a.
b.
c.
d.
The shape of magnetic field around a long
straight current carrying wire is
a.
b.
c.
d.
The magnetic flux will be max, for an angle of
a.
b.
c.
d.
A current carrying conductor carries current
away from you the direction of magnetic field
with respect to you is
Electric flux
Torque
Magnetic flux
Force
Maximum
Minimum
Zero
None
The presence of magnetic field around a
current carrying conductor was detected by
14
a.
b.
c.
d.
25.
T.m/A
T.m2/A
T.m/A2
None
4
4
4
4




 o is
c.
 o NI
 o NL
o N
d.
None
b.
A solenoid of length 500m is wonded into 100
turns. A current of 10 A flows in it, the
magnetic field intensity is
o
200  o
2000  o
33.
c.
F = Fe + Fm is
a.
b.
c.
d.
34.
35.
Two
Three
Four
Five
In C.R.O. the deflecting plats are
a.
b.
c.
d.
36.
Electric force
Magnetic force
Lorentz force
None
The main part of C.R.O is
a.
b.
c.
d.
a. 20
b.
the e/m value of electron is
a. 1.7588 x 1011
b. 1.75599 x 1012
c. 1.7588 x 109
d. 1.7559 x 1014
The magnetic induction of solenoid is
a.
29.
qb
2m
qb
b. f =
2rm
qb
c. f =
2
qb
d.
mr
32.
x 10-6
x 10-7
x 10-8
x 10-9
The frequency of cyclotron is given by
a. f =
Circular path
Rectangular path
To any path
None
The value of
a.
b.
c.
d.
28.
31.
The unit of permiability of free space is
a.
b.
c.
d.
27.
d. None
Ampere’s law is applicable to
a.
b.
c.
d.
26.
H. orested
Ampere
Weber
Henry
Two
Three
Four
None
The material used in fluorescent screen is
d. None
30.
a.
b.
c.
d.
When charge particle enters in the uniform
magnetic field, the magnetic force will be
balance by
a. Electric force
b. Magnetic force
c. Centripetal force
37.
Electric
Magnetic
Phosphors
None
The value of restoring torque in galvanometer
is
15
a.   r
b.   c
c.   m
d. None
38.
In the galvanometer the current is
proportional to
a.
b.
c.
d.
39.
40.
b. Rs =
c.
Rs =
d. Rs =
46.
Rs = Rg
Rs < Rg
Rs > Rg
None
Which of the following is a hard magnet?
a.
b.
c.
d.
47.
Very large
Very small
Unaltered
None
To increase the scale of galvanometer to
twice of its initial value we need to connect a
shunt
a.
b.
c.
d.
Iron
Nickel
Steel
All of them
Ammeter and galvanometer
a.
b.
c.
d.
Are always connected in series
Are always connected in parallel
Both in series and parallel
None
48.
The sensitivity of galvanometer is directly
depends on
a. Magnetic field
b. Area of coil
c. Number of turns
d. All of above
49.
One Tesla is also equal to
To convert a galvanometer into voltmeter we
connect a resistance in
a.
b.
c.
d.
42.
45.
Small resistance
High resistance
Infinite resistance
None
an ammeter can be more sensitive if C/BAN
is made
a.
b.
c.
d.
To find the shunt resistance we used
equation
a. Rs =
41.
44.
Ammeter
Voltmeter
AVO meter
None
IgRg
I  Ig
IsRg
I  Ig
IgRs
R  Ig
IsRs
I  Ig
An ideal voltmeter has
a.
b.
c.
d.
Magnetic field
Electric field
Angle
None
When a small resistance is connected in
parallel to the galvanometer it is called
a.
b.
c.
d.
43.
Series
Parallel
Series or parallel
None
a.
b.
c.
d.
web.m2
web.m-2
web.m
None
AVO-meter is used to find
50.
a.
b.
c.
d.
Current
Voltage
Resistance
All of above
The dot product of magnetic field are area is
called
a.
b.
c.
d.
Electric flux
Magnetic flux
Ampere law
None
16
51.
c) current sensitivity
d) 1mA
One Henry is equal to
a. V. sec/A
c. A.sec/V
52.
b. V.A/sec
d. None
60
a)
b)
c)
d)
The S.I unit of Magnetic Permeability is
a. web/m2
c. web m/A
b. web A/m
d. None of these
61.
53.
Shunt resistor is also called
a. By pass resistor
c. Reactance
54.
b. Specific resistor
d. None
Synchronization controls of CRO are used to
synchronize
a. Frequency
c. Voltage
55.
56.
63.
4v
Br
2v
c. 2
B r
Zv
Br
2v
d. 2 2
B r
b.
64.
Radio
TV Picture tube
Transistor
None
a) V  I g R s
b) V  ( I  I g ) R s
c) V  ( I g  I ) R s
d) V  I g R g
In multi range ammeter
The S.I unit of magnetic permeability is
65.
b) Magnet
d) None of these
Heating a magnet will
66.
a)
b)
c)
d)
59.
b) TmA-1
d) None of these
A solenoid is a cylindrical, long and tightly wound
coil of wire. When a current pass through it
behaves like a
a) Source of emf
c) Electromagnet
58.
b) Doubled
d) None
The potential difference across the shunt resistor
Rs is
a) TmA-2
c) Fm-1
C.R.O is same as
a.
b.
c.
d.
When the number of turns in a solenoid is
doubled without any change in the length of the
solenoid its self induction will be:
a) Resistances of different values are connected in
series with galvanometer
b) Different resistances are connected in parallel with
galvanometer
c) Some resistances are connected in parallel and
some of them are connected in series
d) None
The e/m value for an electron is
a.
57.
62.
In C.R.O the anode are at positive potential
with respect to cathode is
b. high
d. very low
106 Maxwell
108 Maxwell
1010 Maxwell
none
a) Four times
c) Halved
b. Current
d. All of them
a. very high
c. low
1 weber = _______
Weaken it
Strength it
Reverse its polarity
Demagnetize completely
Minimum current require to produced a
deflection of 1mm on a scale at a distance of
1mm is
a) 0.1A
b) 1A
The brightness of the spot formed on the screen
in controlled by the
a) Electron
c) Potential
67.
b) Proton
d) None of these
Due to radial field, a moving coil galvanometer is
a) Comes to rest quickly
b) Magnetic field becomes strong
c) Movement is frequent
d) None of these
17
68.
a) CRO
c) Transistor
A very high resistor Rh is connected in series with
the galvanometer in order to convert it into
voltmeter
76.
a)
c)
69.
V
 Rg
I
Ig
V
 Rg
b)
V
 Rg
Ig
d)
I
 Rg
V
70.
2V
m
2V
c) v 
me
v
d) None
A vertical solenoid has 200 turns in a length of
0.4m and carries a current of 3A in anticlockwise.
The flux density in the middle in Tesla is about
a) 6 10
4
c) 60 10
4
b) 6 10
5
d) None
b) 1T = 106G
d) 1T = 10-6G
b) Restoring couple
d) None of these
3Ve
m
2 Ve
d) v 
m
b)
v
b) Photoemission
d) None of these
The resistance of a voltmeter should have a very
high resistance
a) It does not disturb the circuit
b) It draws some current
c) It same the galvanometer coil
d) None of these
75.
I  Ig
The beam of the electrons is provided by
a) Ionization of atoms
c) Electron gun
74.
77.
I  Ig
Vg
In velocity selector method, the velocity of an
electron is given by
a)
73.
Ig
c) R s 
b) R s 
Couple necessary to produce unit twist is
a) Deflecting couple
c) Torsion couple
72.
V
Rg
I
a) R s 
The relation between Tesla ( T ) and Gauss (G) is
given as
a) 1T = 104G
c) 1T = 10-4G
71.
The shunt resistance connected to a
Galvanometer to convert it into a desired level
current measuring ammeter is
Magnetic flux passing normally, through a unit
area is called
a) Magnetization
b) Magnetic field intensity
c) Magnetic flux density
d) All of these
b) Diode
d) Radio
The wave form of sinusoidal voltage, its
frequency and phase can be found by
CHAPTER # 15
ELECTROMAGNETIC INDUCTION
1.
The induced e.m.f. is produce due to
a.
b.
c.
d.
Motion of coil
Motion of magnet
The rate of change of flux
None
18
2.
Induced electric current can be explained
using which law
a.
b.
c.
d.
3.
Gauss’s law
Faraday’s law
Ohm’s law
Ampere law
In the motional e.m.f. the mechanical energy
consumed is converted into
a.
b.
c.
d.
9.
a.
b.
c.
d.
10.
5.
Faraday’s law
Lenz’s law
Ampere’s law
Right hand rule
The relation of motional e.m.f. is
a.
b.
c.
d.
Heat energy
Internal energy
Steam energy
None
11.
4.
The best way to find the direction of induced
e.m.f. in the circuit is
E=BLV
E=qBl
E=Blq
E=qVB
Generator works on the principle of
If we increase the resistance of coil, the
induced e.m.f. will be
a.
b.
c.
d.
a.
b.
c.
d.
Torque on rectangular coil
Motional e.m.f.
Question is wrong
None
Lenz’s law is consistent with law of
conservation of
12.
Increase
Decrease
Remain same
None
The self-inductance may be defined by

 / t
  / t
b) L =


c) L =
 / t

d) L =
 / t
a) L =
a.
b.
c.
d.
6.
An inductor is a circuit element that can store
energy in the form of
a.
b.
c.
d.
7.
Mass
Energy
Charge
None
Magnetic field
Electric flux
Electric field
None
13.
a. M = -  / p
The induced e.m.f. can also be increase by
increasing
a.
b.
c.
d.
Current
Voltage
No. of turns
None
The mutual inductance b/w two coil is

p / t
c. M = -  /  / t
b. M =
d. None
14.
Inductance are measured by
a) Coulombs
c) Volt
8.
The negative sign with induced e.m.f. is due
to
a.
b.
c.
d.
Faraday’s law
Lenz’s law
Ampere law
None
15.
b) Amperes
d) Henry
The self inductance in case of D.C circuit is
a.
b.
c.
d.
Maximum
Minimum
negligble
None
19
16.
An over loaded motor draws
a.
b.
c.
d.
17.
Max. current
Min. current
Half
None
22.
The self inductance of a solenoid is
a) L =
 n 2

 
b) L =   n 2

2
c) L =   nlA
2 n 
d) L =  

23.
19.
20.
The co-efficient of mutual inductance is equal
to
 p 


 t 
c.  tp
24.
3.57mv
175mv
350mv
None
25.
 t 

 
 p 
d. none
One ampere in secondary coil
Magnetic flux
Current in one ampere in secondary
None
Mutual inductance exists
2
½LI
½ L2 I
½ L2I2
None
a.
b.
c.
d.
The energy stored in the inductor per unit
volume is
a.
 2
2 0

b.
2o
c.

4 0
2
d.
4o
26.
Alternating current changes
a.
b.
c.
d.
27.
Within coil
Out of coil
B/w two coil
None
Its magnitude as well as direction
Only direction but not magnitude
Only magnitude but not direction
None
The coil in A.C generator rotates with
rotational speed of 10rad/sec its frequency is
a.
b.
21.
b.
Mutual inductance is numerically equal to the
e.m.f. induced in the secondary coil when the
rate of change of
a.
b.
c.
d.
The energy stored in the inductor is
a)
b)
c)
d)
Eddy current
Hysteresis
Electric resistance
Inductance
a.
A current of 7Amp/sec flows a steady rate,
through a inductor of inductance 25mh, what is
the induced e.m.f?
a)
b)
c)
d)
Lamination of lamina core of transformer is to
decrease its
a.
b.
c.
d.

2
18.
b. 1.28 J
c. 1.6 mJ
d. None
What energy is stored in an inductor of
40mH, when a current of 8A passing through
it
a. 160 mJ
28.
2  rad/sec
5  rad/sec
5
c.

rad/sec
d.
None
The instantaneous value of A.C. voltage is
a. V = Vo sin 2  ft
b. V = Vo sin 2 ft
20
c. V = Vo sing 2  wt
d. None
29.
In case of A.C. generator the slip rings
a.
b.
c.
d.
30.
b. Slip rings
c. Armature
d. None
36.
Move parallel to coil
Are stationary
Move along the direction of coil
None
The induced e.m.f. in A.C. generator is
a)
b)
c)
d)
37.

a. VBL sin
b. NESN sing
NAB sin
38.
31.
The difference b/w A.C. and D.C. generator
in due to
a.
b.
c.
d.
Slip rings
Commutators
Slip – chip
None
40.
Attract each other
Repel each other
No effect
None of these
a.
b.
c.
d.
Generator
Mater
A.C. Meter
None
42.
Primary
Secondary
Middle
None
In the actual transformer, the output is always
a.
b.
c.
d.
35.
Energy
Power
Voltage
All of above
The coil which is connected to input is called
a.
b.
c.
d.
The back motor effect exist in the
Amperes law
Mutual induction
Motional e.m.f.
None
A transformer is a device which step up or
stop down
a.
b.
c.
d.
41.
Generator
Motor
Transformer
None
The principle of transformer is
a.
b.
c.
d.
Two parallel conducting wires placed closer
to each other carry current in the same
direction will.
a.
b.
c.
d.
34.
The back e.m.f. exist in the
a.
b.
c.
d.
50 Hz
100 Hz
150 Hz
220 Hz
39.
33.
Television
Radar
Tape recorder
All of above
In Pakistan the frequency of A.C. is
a.
b.
c.
d.
32.
Electric motor
A.C. generator
Reverse generator
None
Electric mo0ter are used in
a.
b.
c.
d.


d. NIAB sin 
c.
The back ward generator is called
Equal to input
Less then input
More than input
None
The coil used in the generators is called
a. Commutaters
21
43.
A transformer changes 12V to 1800V and
there are 6000 turns in secondary coil, the no
of turn on primary coil is
a.
b.
c.
d.
44.
50.
40
20
10
2
a.
b.
c.
d.
In ideal transformer when p.d. in double the
current is
a.
b.
c.
d.
To minimize the heating effect in the
transmission lines
51.
Load is a device which consume
a. Mechanical energy
b. Electrical energy
c. Frictional energy
d. None
Doubled
Tripled
Halved
Same
52.
45.
Power is effectively supplied to primary coil of
step up transformer by
a.
b.
c.
d.
A.C. generator
D.C. generator
Battery
Motor
a. Output voltage = Input voltage
b. Output current = Input current
c. Output power = Input power
d. Output energy = Input energy
Step up transformer
Step down transformer
For both
None
54.
The eddy current produced
a.
b.
c.
d.
48.
Power loss
Heating
Both a and b
None
To over come the eddy current, the core is
a.
b.
c.
d.
49.
A transformer is said to be efficient if
An adopter is an example of
a.
b.
c.
d.
47.
Induced e.m.f is
a. Directly proportional to change in flux
b. Directly proportional to rate of change
of flux
c. Inversely proportional to change of flux
d. None of these
53.
46.
High current low voltage in used
High voltage low current in used
Same voltage and current in used
None
Laminated with insulation
With magnetic
With plastic
None
For a good transformer the hysterics loop are
_______ in size.
a.
b.
c.
d.
55.
Small
Large
Zero
None
The ratio of e.m.f’s of two cells is equal to
a.
2
c.
1
1
b. 1 : 2
2
d. 2 : 1
If a 3cm of wire is moved at right angle to the
magnetic field with a speed of 2 miles/sec and if
flux density is 5 Tesla, what is the magnitude of
induced e.m.f?
a. 0.03v
c. 0.6v
56.
b. 0.3v
d. 10v
When a transformer is connected to 120 volt A.C
it supplies 3000 volt to device, the current
through secondary winding is 0.6 amp and
current through primary is 2 amp, the no. of turns
on primary is 400. what is the efficiency of
transformer?
a. 75%
c. 85%
b. 80%
d. None of these
22
57.
A.C and D.C have same
66.
a. Effect in charging a capacitor
b. Effect in charging a battery
c. Effect while passing through an inductor
d. Heating effect through a resistor
58.
59.
A solenoid of area of cross section 2.0cm 2 and
length 100cm stores energy. When current of
5.0A flowing in it produces B = 0.1T then the
stored energy is
a) (10-6μo)J
c) (10-6/μo)J
63.
69.
70.
71.
72.
The devices in the circuit that consume electrical
energy are known as
a) Inductor
c) Load
b) Radio
d) Transformer
If the emf across the conductor of length 1m
moving with a uniform speed at right angles to a
magnetic field of 0.5T is 2V, the velocity of the
conductor is
b) 2 ms-1
d) 8 ms-1
What is the self inductance of a coil when a
change of current from 0 to 2A in 0.05sec
induces an emf of 40V in it?
a) 1H
c) 3H
In mutual induction, the mutual inductance of the
two coils depends upon
b) Armature
d) None of these
The application of mutual induction is a
a) 1 ms-1
c) 4 ms-1
73.
65.
The Jerks are created by the use of
a) Television
c) D.C. motor
b) 400%
d) None
a) Number of turns
b) Area of cross section of coil
c) The distance between the two coils
d) All of them
Radio frequency (R.F.) shielding of a coil means
to protect from external circuit
a) Commutator
c) Torques
b) (106/μo)J
d) None
If the speed of rotation of AC generator is made
four times of its initial value, the percentage
increase in an induced emf is
a) 100%
c) 300%
64.
b) DC circuits
d) None
In an ideal transformer, the following factors are
used
a) Varying magnetic field
b) Magnetic field
c) Dust and heat
d) Electric field
Self induction is greater in
a) AC circuits
c) Both in AC & DC
62.
68.
b. Zero
d. None of these
b. Self inductance
d. Heating effect
b) Current
d) None of these
a) Input and output power is same
b) Currents are inversely proportional to voltage
c) Currents are directly proportional to voltage
d) None of these
Non inductive resistances are used in decreasing
a. Mutual inductance
c. Magnetic field
61.
67.
b. Soft iron
d. Accelerating charge
When motor is at its Max. speed the back e.m.f
will be
a. Maximum
c. Cannot tell
60.
a) Inductance of coils
c) Voltage
Magnetic compass needle will be deflecting, if it
is kept near
a. Static charge
c. Semi conductor
The back emf effect in motors changes due to
b) 2H
d) 4H
A pair of coils has a mutual inductance of 2H. If
the current in the primary changes from 10A to
zero in 0.1sec, the induced emf in the secondary
will be
a) 100V
c) 300V
b) 200V
d) 400V
b) Capacitor
d) None of these
23
74.
A copper ring is held horizontally and bar magnet
is dropped through the ring with its length along
the axis of the ring. The acceleration of the falling
magnet is
CHAPTER # 16
ALTERNATING CURRENT CIRCUITS
1.
a) Equal to that due to gravity
b) Less than that due to gravity
c) More than that due to gravity
d) Depends on the diameter of the ring and the
length of the magnet
75.
An emf of 0.003V is induced in a wire when it
moves at right angles to uniform magnetic filed
with a speed of 4m/sec if the length of the wire in
the field is 15cm, what is the flux density in
Tesla?
a) 0.003
b) 0.005
c) 6
d) 12
e) 2000
The A.C. e.m.f. can be represented by the
wave form called
a.
b.
c.
d.
2.
The mean value of A.C. over a complete
cycle in
a.
b.
c.
d.
3.
Matter wave
Mechanical wave
Electromagnetic wave
Transverse wave
A battery can pass only steady current
through
a.
b.
c.
d.
7.
In phase
Voltage leads the current
Current leads the voltage
None
The waves which can also pass through the
vacuum are
a.
b.
c.
e.
6.
0.707 Io
0.707 Vo
0.708 Ro
None
In pure resistive A.C. circuit the voltage and
current are
a.
b.
c.
d.
5.
Maximum
Minimum
Zero
None
The r.m.s. value of A.C current in
a.
b.
c.
d.
4.
Sinusoidal
Cosine wave
Tangent wave
None
Resistors
Capacitors
Inductors
All of above
The quality which is called argument of sine
or cosine function is
24
a)
c)
t
2
2T
d) 
2
d. None
b)

15.
The resistance of inductor is represented by
a) Xc
c) RL
8.
The unit used for capacitive reactance is
a.
b.
c.
d.
9.
10.
Volt
Ampere
Joule
Ohm
If the frequency of A.C in large the reactance
of capacitor is
a.
b.
c.
d.
16.
Large
Small
Zero
None
In case of capacitor, the voltage lage- behind
the current by
18.
a.
b. 60o
c. 30o
d. 180o
If the capacitance of capacitor is 1µF and the
frequency of A.C is 50Hz then reactance will
be
a.
b.
c.
d.
12.
Zero
Maximum
Minimum
None

t

c.   L
t
14.
 L
b.  L
21.
p
t
In pure inductive circuit the voltage
a. Lead the current by 90o
b. Ledge the current by 90o
c. Remain same with current
22.
Clockwise
Anti clockwise
Remain stationary
None
In case of phasor diagram the velocity vector
is called
a.
b.
c.
d.
d. None
Increases
Decreases
Remain same
None
In case of phasor diagram the vector rotates
a.
b.
c.
d.
The magnitude of back e.m.f. in the inductor
is
a.
20.
Inductor
Capacitor
Resistor
Choke
By increasing the frequency of A.C. through
an inductor the reactance will be
a.
b.
c.
d.
In the pure inductor the resistance is
a.
b.
c.
d.
13.
3184
3190
3140
3150
Maximum
Minimum
Zero
None
The device which is used for controlling A.C.
without dissipation of energy is called
a.
b.
c.
d.
19.
Half
Same
Double
Triple
The average power dissipated in a pure
inductor is
a.
b.
c.
d.
90o
11.
If the frequency of A.C. is double inductor the
reactance will be
a.
b.
c.
d.
17.
b) XL
d) None
Null vector
Unit vector
Phasor
None
The combine opposition of resistor capacitor
and inductor is called
a. Reactance
b. Resistor
25
c. Impedance
d. None
23.
24.
30.
a) Joule
c) Ampere
b. Z =
R 2  X L  Xc 2
c.
R 2  ( XL  Xc) 2
b) Weber
d) Ohm
a. V =
 R 2  Xc 2
b. V =
 R  XL
2
32.
V
I
V
b. Z =
I
Z
c. V =
I
33.
d. None
34.
R 2  XL2
b. V = I
c. V = IR
d. None
R 2  Xc 2

In equation P = VI cos  , the factor cos
called
a) Cosine
c) Power factor
29.
36.
 is
37.
b) Cos 
d) None
b) 60 Hz
d) 20 Hz
In parallel circuit of A.C. there will be
maximum
b) Amplifier
d) None
The current which is produce due to changing
electric flux is called
a.
b.
c.
d.
38.
b) Voltage
d) None
The electrical oscillators are used in
a) Metal detectors
c) Diode
At what frequency will a 1H inductor have
reactance of 500 ohms
a) 80 Hz
c) 40 Hz
Maximum
Minimum
Can not explain by give data
None
a) Power
c) Impedance
The average power in case of A.C. series
circuit is
b) P = VI cos 
d) None
Resonance frequency
Threshold frequency
Non-frequency
None
At resonance frequency the impedance of
A.C series circuit is
a.
b.
c.
d.
35.
b) Zero
d) Three
The frequency at which XL is equal to Xc in
called
a.
b.
c.
d.
The magnitude of voltage in case of RL –
service circuit
b) Independent
d) None of these
At resonance frequency the power factor is
a) One
c) Two
The impedance of RC – series circuit is
a) P = VI
c) P = VI sin
28.
The behavior of resistance is frequency
a) Dependent
c) No, response
2
a. V = I
Z=
2
d. None
When A.C. flow through RC series circuit the
magnitude of voltage is
a. R =
27.
2
a. Z = R2 +
c. V = IR
d. None
26.
Xc 2  X L
The S.I unit of impedance is called
31.
25.
In case of RLC series circuit the impedance
of circuit is
Displacement current
Conduction current
Eddy current
None
The fundamental requirement for the
generation of electromagnetic wave is
a. Oscillation of electric charge
26
b. Motion of electric charge
c. Motion of electron
d. None
39.
The speed of light was found by formula
a) c =
1
41.
42.
For the reception of electromagnetic wave we
use a variable
44.
The process of combing the low frequency
signal with high frequency radio-wave is
called
46.
51.
52.
53.
b) Amplification
d) None
b) F.M
d) M.W
b) 350.5v
d) None of these
The types of modulations are
1
b) W =
LC
LC
LC
1
2 LC
L C
d) None
b)
2 LC
d)
1
2
LC
What is the self inductance of a coil in which
an induced e.m.f of 2 volt is setup when
current changes at the rate of 4 A/sec.
a. 0.5 m H
b. 0.5H
c. 2H
d. 0.5volt
When coil of high inductance is used for
controlling A.C without dissipation of energy
is called
a. Inductor
c. Impedance
b. Choke
d. None
An A.C choke is a coil consist of thick
copper wire, wound closely over a
a. Soft iron core
b. Hard iron core
c. Soft iron laminated core
d. None
54.
An A.C voltmeter reads 250volts, its peak
voltage is
a) 250v
c) 353.5v
47.
1
4
Which one give more quality transmission
a) A.M
c) S.W
1
Natural or Resonant frequency of an LC
circuit is
c)
Frequency Modulation
Frequency Metal
Frequency Member
None
a) Modulation
c) Rectification
45.
50.
F.M stands for
a.
b.
c.
d.
The angular frequency of resonance circuit is
c) W =
b) Capacitor
d) None
Amplitude Modulation
Applied Metal
Accurate Measurement
None
Source current
e.m.f. current
Applied voltage
None
a) W =
A.M stands for
a.
b.
c.
d.
43.
49.
Frequency Modulation
Amplitude Modulation
No, effect
None
a) Resistor
c) Inductor
In A.C. parallel resonance circuit branch
current may be granter then
a.
b.
c.
d.
d) None
The super position of sonic wave on EM
waves that causes a change in vertical shape
of EM waves is
a.
b.
c.
d.
48.
b) Two
d) Four
b) c = s/t
o o
c) c = 2  rt
40.
a) One
c) Three
The power consumption in A.C choke is
a. Small
c. Zero
55.
b. High
d. Maximum
The reciprocal of impedance is called
a. Conductance
c. Admittance
b. Inductance
d. None
27
56.
Which one is prefer for transmission of
radio signal.
a. X – rays
b. Infra red rays
c. Larger than infra red
d. Smaller than infra red
57.
a) Expensive
c) Sometimes both a & b
64.
When a radio station is broadcasting a
musical program, the antenna of its
transmitter
radiates
a. R.F electromagnetic waves
b. A.F electromagnetic waves
c. R.F longitudinal waves
d. A.F longitudinal waves
a. One time
c. Four times
61.
62.
The combined effect a resistance R, an
inductance L, a capacitance C is known as
a) Resistance
c) Impedance
69.
b. Two times
d. None of these
70.
In an LCR circuit, if V is the effective value of the
applied voltage, VR is the voltage across R, VL is
the effective voltage across L, VC is the effective
voltage across C, then:
The alternating current transmission for long
distances has
b) XL < XC
d) None of these
The phase difference between coils of three
phase A.C is
b) 45o
d) 120o
Since there are three coils, the generator has the
terminals
a) Two
c) Six
71.
b) Reactance
d) None of these
The condition of resonance reached when
a) 60o
c) 90o
b) ½
d) Not defined
a) V = VR + VL + VC
b) V2 = VR2 + VL2 + VC2
2
2
2
c) V = VR + (VL – VC) d) V2 = VL2 + (VR – VC)
63.
In an inductor the phase difference between the
current and voltage is
a) XC > XL
c) XL = XC
At resonance, the value of the power factor in an
LCR series is
a) Zero
c) 1
67.
68.
During each cycle A.C voltage reaches
its peak value
b) Independent
d) None of these
a) Current lags voltage by 90o
b) Voltage lags current by 180o
c) Current leads voltage by 90o
d) None of these
An A.C varies as a function of
a. Voltage
b. Current
c. Voltage and current
d. Time
The behaviour of resistance is frequency
a) Dependent
c) No response
66.
60.
b) Large
d) None of these
Television programs are carried away by
65.
59.
At high frequency the reactance of the capacitor
is
a) Low
c) Very large
a. Low frequency waves
b. High frequency waves
c. Microwaves
d. None
58.
b) Low cost
d) None of these
b) Four
d) Eight
Modulation is the process in which
a) Amplitude is change b) Frequency is change
c) Both a & b
d) None of these
72.
The frequency of modulated carrier waves is
lowest when signal amplitude is
a) Maximum negative value
28
b) Maximum positive value
c) Amplitude zero
d) None of these
73.
In a FM broadcast in VHF band channel width is
a) 75
c) 88
74.
Find the impedance of an AC circuit when the
current flowing in it is 100mA and 10 volts are
applied to the circuit.
a) 500 Ω
c) 23 Ω
75.
1.
b) 100 times
d) None of these
b) 40V
d) 45V
2.
3.
1  B
2 r t
    e
c) B 

2 r
t
B
1  e
2 r t
1 t
d) B 
2 r  e
b)
B
In RLC series AC circuit, when XL = XC then
impedance is
a) Minimum
c) Zero
What are the dimensions of stress?
b) Maximum
d) None
b) Strains
d) Pressure
A rubber cord of cross-sectional area 2cm2 has a
length of 1m. when a tensile force of 10N is
applied, the length of the cord increases by 1cm.
what is the young’s modules of rubber?
a.
b.
c.
d.
6.
b) ML-2T-1
d) MLoT-1
Which one of the following physical quantities
does not have the dimensions of force per unit?
a) Stress
c) Young’s modulus
5.
78.
Nm-2
Jm-2
Nm-1
Being number, its has no unit
a) MLT-2
c) ML-1T-2
4.
b) Steel
d) Copper
What is the S.I unit of modules of elasticity of
substances?
a.
b.
c.
d.
The magnetic field intensity at appoint due to rate
of change of electric flux is
a)
Which of the following substances possesses the
highest elasticity?
a) Rubber
c) Glass
The peak value of sinusoidal voltage in an AC
circuit is 50V. The rms value of voltage is roughly
equal to
a) 70V
c) 35V
77.
b) 100 Ω
d) 20 Ω
CHEPTER # 17
PHYSICS OF SOLIDS
How many times per second will an incandescent
lamp reach maximum brilliance when connected
to a 50Hz source?
a) 50 times
c) 200 times
76.
b) 25
d) 200
2 x 108 Nm-2
5 x 106 Nm-2
0.5 x 10-6 Nm-2
0.2x10-6 Nm-2
A wire of length L is stretched by a length L when
a force F is applied at one end. If the elastic limit
is not exceeded, the amount of energy stored in
the wire is _____________
29
a) FL
c) FL2/L
7.
extension 1. the energy stored in wire is ½ FL
only if _________
b) ½ (FL)
d) ½ FL2/L
a. The extension of the wire is proportional to the
force applied.
b. The weight of the wire is negligible
c. The wire is not stretched beyond its elastic limit
d. The cross sectional area of the wire remains
constant
When a force is applied at one end an elastic
wire, it produce a strain E in the wire If “y” is
young’s modules of the material of the wire, the
amount of energy stored per unit volume of the
wire is given by ________
a) YE
c) YE2
b) ½ YE
d) ½ YE2
14.
Formation of large molecule by joining
small molecules is __________
a. Fusion
c. Crystallization
8.
A wire, suspended vertically from on end, is
stretched by attaching a weight of 20N to the
lower end. The weight stretches the wire by
1mm. how much energy is gained by the wire?
a) 0.01J
c) 0.04J
9.
b) 0.02J
d) 1.0J
A certain stress applied to an elastic materials
produces a certain strain in it. If the elastic limit
is not exceeded, the energy gained per unit
volume of the material is given by_________
a) Stress/strain
c) Stress x strain
10.
15.
b) ½ (stress × strain)
d) (stress x strain)
17.
18.
a) Brittle
c) Amorphous
13.
b) Ductile
d) Polymers
The curie temperature is that at which ______
A ferromagnetic will become fully magnetized at
_______
a. High voltage A.C
b. Low voltage A.C
c. Alternating current at its peak value
d. D.C current is peak value
11. The ratio stress to strains in young’s modules of
the materials then tension is _______
12. Materials that undergo plastic deformation before
breaking are called ___________
The energy band occupied by the valence
electrons is called ________
a. Semi conductor becomes conductors
b. Ferromagnetic becomes paramagnetic
c. Paramagnetic becomes diamagnetic
d. Metal becomes super conductor
b) 0.050J
d) 0.100J
a) Directly proportional to extension
b) Directly proportional to strains
c) Directly proportional square of
amplitude
d) Inversely proportional to extension
b. Ductility
d. deformation
a. Energy state
b. Valence band
c. –ve energy state d. Conduction band
A uniform steel wire of length 4m and area of
cross section 3 x 10-6 m2 is extended by 1mm
by the application of a force. If the young’s
modules of steel is 2x1011Nm-2, the energy
stored in the wire is ____________
a) 0.025J
c) 0.075J
Any alteration produced in shapes, length or
volume when a body is subjected to same
internal force is called __________
a. Stiffness
c. extension
16.
b. Polymerization
d. Subtraction
19.
Coercion force is the force which opposes
a. Demagnetization
c. Extension
20.
b. Breakage
d. Surface cracking
Materials in which valence electrons are tightly
bound to their atoms at low temperature are
called _________
a. Semi conductors
c. Insulators
b. Super conductors
d. Conductors
A wire is stretched by a force F which causes an
30
21.
The bulk properties of materials such as their
mode of fracture, can be related to their
a. Polymerization
c. Microstructure
22.
b. Cleavage
d. Dislocation
24.
26.
27.
A vacant or partially filled band is called _____
36.
37.
The electrons in conduction band are free to
___________
b. Conductors
d. Non-metals
The net charge on N-type material is ________
b. Negative
d. Neutral
Very weak magnetic fields are detected by _____
a. Squids
b. Magnetic resonance imaging
c. Magnetometer
d. Oscilloscope
A completely filled band is called _______
a. Semi-conductors
c. Metals
In a semi conductors, the charge carriers
are __________
a. Positive
c. Both a & b
b. Valence band
d. Empty band
Which one has the greatest energy gap _______
b. insulators
d. all of the above
a. Holes only
b. Electrons only
c. Electrons and holes both
d. All of the above
35.
a. Transport vibrations b. Transport signals
c. Transport charge
d. Transport impulses
30.
34.
b. Nine corners
d. Six corners
b. Valence band
d. Core band
Holes can exists in_________
a. Conductors
c. semi conductors
a. Electrical insulators alone
b. Electrical conductors alone
c. Electrical semi conductors alone
d. All of the above
a. Conduction band
c. Forbidden band
29.
33.
The band theory of solids explains satisfactorily
the nature of
a. Conduction band
c. Forbidden band
28.
a. Decreases
b. Increases
c. Remain the same
d. First increases, then decreases
b. Homogeneity
d. Clearage
In simple cube, one atom or molecule leis at its
a. Four corners
c. Eight corners
With increase in temperature, the electrical
conductivity of intrinsic semi conductors ______
b. Symmetry
d. Homogeneity
If the density of atoms remains the same along
any direction in a crystal is called
a. Symmetry
c. Isotropy
25.
32.
The breaking of a crystal along definite direction
is called
a. Cleavage
c. Isotropy
many of the semi conductors are crystals of the
type ________
a. Face centered cubic
b. Body centered cubic
c. Simple cubic
d. All of the above
The angular position of cells remains the same
for a sample of a crystal this property is called
a. Isotropy
b. Cleavage
c. Homogeneity
d. The external symmetry of form
23.
31.
Energy needed to magnetic and demagnetize is
represented by
a. Hysterics curve
c. Hysterics loop
38.
b. Hysterics loop area
d. Straight line
Pentavalent impurities are called
a. Donor impurities
b. Acceptor impurities
c. Some times donor and some times
acceptors
d. None of these
31
c. Weinberg
39.
49.
a. Electrons
c. Neutrons
40.
b. Protons
d. Holes
According to free electron theory the only energy
possessed by electron is
a. K.E
c. Gravitational
41.
Examples of brittle substances are
a. Glass
c. Lead
50.
b. P.E
d. Electrical
The area under stress – strain graph is
a. Power
c. Momentum
51.
b. Energy
d. Impulse
a. Metals
c. Ceramics
53.
Young’s Modulus for copper is
b. Partially filled
d. None of these
When semiconductor is doped by trivalent, it has
Solid material that are brittle are
a. Toughness
c. Stiffness
a. More electrons
c. + ive charge
b. Ductile
d. None
56.
The temperature at which conductors lose its
resistivity is called
a. Supper temperature b. Kelvin temperature
c. Critical temperature d. None
57.
b. Micrometer
d. None
a. 400 km/hr
c. 500 km/hr
b. 450 km/hr
d. 550 km/hr
59.
a. Fermi
b. Kmaerling
60.
b. Copper
d. All of them
Strain is dimensionless and has
a. Units
c. S.I units
The first supper conductor was discovered by
b. 650oC
d. 750oC
The examples of diamagnetic are
a. Water
c. Antimony
A bullet train move with max the speed of
b. Toroid
d. None
The curie temperature of Iron is
a. 600oC
c. 700oC
58.
b. More holes
d. – ive charge
The field of long bar magnet is like a
a. Solenoid
c. Pieces of magnet
The magnetic domains are the small regions of
the order of
a. Millimeter
c. Micron
48.
The valence energy band can never be
a. Filled
c. Empty
b. Ductility
d. None
55.
47.
b. Very close
d. None
The resistance against any distortion by solid is
a. Toughness
c. Stiffness
46.
b. 55
d. 110
When an atom is isolated its energy lavels are
a. Distinct
c. Very very close
54.
45.
b. Ionic compounds
d. All of them
Polymers are usually
a. Organic compounds
b. Non-organic compounds
c. Acidic
d. Alkaline
44.
b. Nitrogen
d. All of them
Crystalline solids are also
a. 25
c. 100
43.
b. Copper
d. None
Polymers have chemical combination with
a. Carbon
c. Hydrogen
52.
42.
d. None
Minority carriers in N-type materials are
b. No units
d. None
How many types of strain are there
32
a. One
c. Three
a) Atoms
c) Unit cell
b. Two
d. Four
69.
61.
The ability of a material to be hammered,
pressed, bent, rolled, cut, stretched into useful
shape is
a) Toughness
c) Stiffness
62.
b) Ductility
d) None
The Young modulus of elasticity is Y. If the forces
is increased such that the extension produced
becomes double of its initial value then Young
Modulus is
a) Double
c) Unchanged
Polymers have chemically combinations with
a) Carbon
c) Hydrogen
70.
b) Halved
d) None
A hydraulic press contains 0.25m3 oil of bulk
modulus 5.0 × 107 Pa. The change in volume of
oil when subjected to pressure increase of 1.6 ×
107 Pa is
a) – 8.0 × 10-4 m3
c) 2.0 × 10-4 m3
64.
b) 4.0 × 10-4 m3
d) 10-4 m3
The resistivities of conductors, semiconductors
and insulators are of the respective orders of
a) 108 Ω.m, 10-4 Ω.m
b) 10-4 Ω.m, 104 Ω.m, 108 Ω.m
c) 10-4 Ω.m, 108 Ω.m, 104 Ω.m
d) 104 Ω.m, 10-4 Ω.m, 108 Ω.m
65.
73.
74.
75.
b) Very small
d) None of these
Doping is the process in which the small amount
of impurity is added into the pure semiconductor
lattice in the ratio
b) 1 to 104
d) 1 to 106
The technological uses of super conductors are
a) MRI
b) Magnetic levitation trains
c) Faster computer chips
d) All of them
b) Ionic compounds
d) All of them
With the rise of temperature the amplitude of
atoms
a) Slow down
c) Increases
68.
Conductors are those materials in which the free
electrons
a) 1 to 103
c) 1 to 105
b) Anti parallel to B
d) None
b) Valence band
d) None of these
Crystalline solids are also
a) Metals
c) Ceramics
67.
The electrons occupying the outermost shell of
an atom and the electrons occupying in the
energy band are called
a) Very large
c) Plenty of
76.
66.
b) 10-6 to 10-4 (Ω.m)-1
d) None of these
a) Energy band
c) Forbidden energy band
Diamagnetic needle when placed between the
poles of a magnet align itself in the direction
a) Parallel to B
c) Perpendicular to B
b) Copper
d) None of these
Semiconductor materials have the conductivities
generally lies between
a) 10-5 to 10-6 (Ω.m)-1
c) 10-7 to 10-3 (Ω.m)-1
63.
b) Elasticity
d) None of these
Examples of brittle substances are
a) Glass
c) Lead
72.
b) Nitrogen
d) All of them
If the stress increased on a material is beyond
the yield strength of the material is called
a) Plasticity
c) Still in elasticity
71.
b) Molecules
d) All of them
b) Fixed
d) None of these
77.
The magnetism produced by electrons within an
atom is due to
a) Spin motion
b) Orbital motion
c) Spin & orbital motion d) None of these
Crystal lattice is a repetition of
33
78.
The combination of solenoid and a specimen of
iron inside it make a powerful magnet called
a) Horse shoe magnet b) Bar magnet
c) Electromagnet
d) 10-10 to 1018
79.
In the phenomenon of hysteresis, the magnetism
and magnetizing current behaves as
a) 1 lags
c) 1 & B becomes equal
80.
A current which demagnetize the material
completely is called
a) Applied current
c) Maximum current
81.
b) 1 leads B
d) None of these
b) Coercive current
d) None of these
The energy need to magnetize and demagnetize
the specimen during the each cycle of
magnetizing current is
a) Value of current
b) Value of demagnetizing current
c) Value of magnetic flux density
d) Area of the loop
82.
The strain energy density is given by
1
( Stress  Strain )
2
1
b) U  ( Stress  Strain)
3
c) U  Stress  Strain
CHAPTER # 18
ELECTRONICS
a) U 
d) U  ( Stress  Strain )
83.
3
When the conductivity of a semiconductor is only
due to breaking of the covalent bonds, the
semiconductor is called
a) Donor
c) Intrinsic
84.
1
b) Acceptor
d) Extrinsic
What is the S.I unit of magnetic permeability?
a) Ampere per meter
b) Ampere meter
c) Henry per meter
d) Being a dimensionless number, it has no unit
1.
A semi – conductor can be used as a rectifier
because
a) It has low resistance to the current flow when
forward biased
b) It has high resistance to the current flow when
reversed biased
c) It has low resistance to the current flow when
forward biased and high resistance when reversed
biased
d) None of the above
2.
In half ware rectification, the output DC
voltage is obtained across the load for
a) The positive half cycle of input AC
b) The negative half cycle of input AC
c) The positive and negative half cycles of
input AC
d) Either positive or negative half cycle of input AC
3.
a)
b)
c)
d)
A bridge rectifier is preferable to an ordinary
two diodes full ware rectifies because
It uses four diodes
Its transforms has no counter tap
It needs much smaller transformer
It has higher safety factor
34
10.
4.
a)
b)
c)
d)
Its forward biased
Its reversed biased
The amount of forward current
The type of semi conductor material used
5.
A PN junction photodiode is
a)
b)
c)
d)
Operated in forward direction
Operated in reversed direction
A very fast photo detector
Dependent on thermally generated
minority carriers
6.
a)
b)
c)
d)
When the E-B junction of a transistor is
reversed – biased, collector current
The color of light emitted by LED depends on
The emitter of a transistor is generally doped
the heaviest because it
Has to dissipate maximum power
Has to supply the charge carriers
Is the first region of transistor
Must posses law resistance
a) Is reversed
c) Decreased
11.
b) Increased
d) Stops
An op-AMP has
a) Infinite AV
c) Zero Ro
b) Infinite Ri
d) All the above
An inverting amplifier has Rf = 2mл and Ri =
2Kл, its scalar factor is
12.
a) 1000
c) 10-13
13.
a)
b)
c)
d)
14.
b) -1000
d) -10-6
A diode characteristic curve is a graph
between
Current and time
Voltage and time
Voltage and current
Forward voltage and reverse current
A NOR Gate is ON only when all its input are
a) ON
c) Positive
7.
For proper working of a transistor in normal
circuits
15.
a) Emitter base junction is reversed biased, collector
base junction is forward biased
b) Emitter base junction is forward biased and
collector base junction is forward biased
c) C-B junction is reversed biased, E-B junction is
forward biased
d) C-B junction is reversed biased and E-B
junction is reversed biased
8.
a)
b)
c)
d)
A logic gate is an electronic circuit which
a.
b.
c.
d.
16.
Recombine with holes in the base
Recombine in the emitter itself
Pass through the base to the collector
Are stopped by the junction barrio
IC
IE
IB
c.
IE
a)
b)
c)
d)
17.
Positive voltage
Higher voltage level
Zero voltage level
Lower voltage level
The output of a 2-input OR gate is zero only
when its
a.
b.
c.
d.
The current gain of a transistor is given by
IC
IB
I
d. B
IE
Makes logic decision
Work on binary algebra
Alternates between 0 and 1
None of these
In positive logic, logic state 1 correspond to
In a properly biased NPN transistor most of
the electrons from the emitter
9.
a.
b) OFF
d) High
Both input are zero
Either input is 1
Both input are 1
Either input is 0
b.
18.
An XOR gate produces an output only when
its two inputs are
a) High
c) Different
b) Low
d) Same
35
19.
An AND Gate
27.
a.
b.
c.
d.
20.
Implement logic addition
Is equivalent to a series switching circuit
Is any or all gate
Is equivalent to a parallel switching circuit
a.
b.
c.
d.
28.
Stop a signal
Re-complement a signal
Invert an input signal
Acts as a universal gate
The waves from the antenna are
a.
b.
c.
d.
Expanding plane wave fronts
Concentric spheres
Expanding curves
None of the above
A NOR gate is ON only when all its input are
29.
a) ON
c) Positive
22.
Stationary
Longitudinal
Transverse
All of the above
The only function of a NOT gate is to
a.
b.
c.
d.
21.
EM waves emitted from antenna are
b) OFF
d) High
Which of the following are electromagnetic
waves
a.
b.
c.
d.
EM waves have frequency of the range of
a. 104Hz
c. 106Hz
30.
Sound waves
Water waves
Light waves
Waves along a stretched string
b. 105Hz
d. 1012Hz
Maxwell derived mathematically that velocity
of EM-waves is
a.
c.
I
o
o
b.
I
uo
d.
I
 o uo
uo
23.
The EM waves travel is free space with the
velocity
a.
b.
c.
d.
24.
25.
An electric field
A magnetic field
An electromotive force
Gravitational field
26.
32.
b) Wavelength
d) Charge
Waves emitted from the antenna are
a.
b.
c.
d.
Longitudinal waves
EM waves
Sound waves
Radio waves
A rectifier
An amplifier
A semi conduction
An oscillator
The forward current through a semiconductor
diode circuit is due to
a) Minority carriors
c) Holes
33.
EM waves transport
a) Matter
c) Energy
A junction between P and N materials forms
a.
b.
c.
d.
Equal to the velocity sound
Equal to the velocity light
More than the velocity of light
Less than the velocity of light
A changing electric flux develops in the
surrounding space
a.
b.
c.
d.
31.
The device used for conversion of AC into
DC is
a) An oscillator
c) An amplifier
34.
b) Majority carriors
d) Electrons
b) A detector
d) A rectifier
A photo diode is a semi conductor device
usually made from
a) Bismuth
c) Antimony
b) Arsenic
d) Silicon-dioxide
36
35.
Specially designed semi conductor diodes
used as fast counters in electronic circuits are
a.
b.
c.
d.
36.
Photo diodes
LED
Solar cell
Photo voltaic cell
37.
45.
The specially designed semi conductor
diodes used as indicator lamp in electronic
circuit are
a) Photo diodes
c) LED
a. low
c. Very High
b) Solar cell
d) Photo voltaic cell
The resistance between + ive and – ive
inputs of op – amplifier is
a. 100 Ω
c. 106 Ω
47.
Transfer of current
Transfer of voltage
Transfer of resistance
Transfer of charge
The thickness of depletion region is of the
order of
a) 10-7 cm
c) 10-5 cm
b) 10-6 cm
d) 10-4 cm
50.
b) Sound waves
d) Matter waves
a.
b.
c.
d.
41.
Zero resistance
Infinite resistance
Low resistance
High resistance
52.
b. Micro seconds
d. None
A transistor is a circuit basically act as
A Transformer used in rectification acts as
a. Step-up
c. Center trapped
a. Voltage amplifier
c. Power amplifier
b. Step-down
d. None
55.
44.
A photo – diod can switch its current ON and
OFF in
a. Milli seconds
c. Nano seconds
b. 0.67v
d. 0.8v
54.
43.
b. 60%
d. 90%
The P.d across the depletion region of silicon is
a. 0.5v
c. 0.7v
42.
b. Two inputs
d. None
The efficiency of half wave rectifier is roughly
a. 40%
c. 70%
53.
b. Switches
d. All of them
NOT gate has only
a. One input
c. Many inputs
A junction diode when forward biased
behaves as a device of
b. 2
d. 3
Transistor can be used as
a. Oscilators
c. Memory unit
51.
b. No external bias
d. None
In NOR gate 1 + 1 = ________
a. 0
c. 1
In amplitude modulation, the wave
superimposed on EM waves are
a) Water waves
c) Light waves
40.
b. 1000 Ω
d. None of these
Photo – voltic cell have
a. Battery input
c. No internal bias
49.
39.
b. 1000
d. Cannot tell
The term transistor stands for
a.
b.
c.
d.
38.
What is the gain of op – amplifier if R1 = infinity
and R2 = 0Ω
a. 15
c. 1
46.
b. high
d. None
b. Current amplifier
d. None
The ratio of β shows the
Transistor is a device which has ________
terminals.
a. voltage gain
c. input resistance
a. One
c. Three
b. current gain
d. None
b. Two
d. Four
The alarm requires a voltage for its activation is
37
56.
The Boolean expression X = A + B represents
the logic operation of
a. NAND gate
c. OR gate
57.
58.
b. NOR gate
d. NOT gate
A diod can not be used as
a. Rectifier
c. Oscilator
a) AND gate and NOT gate
b) AND gate and OR gate
c) OR gate and NOT gate
d) NOT gate and NOT gate
65.
b. Detector
d. Amplifier
a) Microampere
c) Both
66.
The open loop gain of op – amplifier is
a. Zero
c. Very high
60.
67.
b. High
d. Low
The width of depletion region of a diode
68.
62.
In a pn junction, the barrier potential offers
opposition to only
Vin
V
c) A  V Vin
70.
In the use of a transistor as an amplifier
a) The emitter-base junction is forward biased
and the collector-base junction is reverse
biased
b) The emitter-base junction is reverse biased
and the collector-base junction is forward
biased
c) Both the junctions are forward biased
d) Any of the two junctions may be forward
biased
64.
A
b)
A
V
Vi
d) None of these
The positive sign of the gain indicates that
a) Input and output signals are not in phase
b) Input and output signals are in phase
c) May be in phase or not
d) None of these
a) Majority carriers in both regions
b) Minority carriers in both regions
c) Electrons in n – region
d) Holes in P – region
63.
b) 10-4m
d) 10-8m
The gain A of the amplifier is
a)
b. Reverse Biased
d. None of these
b) Millisecond
d) None of these
The base of the transistor is very thin of the order
of
a) 10-2m
c) 10-6m
69.
b) Three
d) None of these
A photodiode can turn its current ON and OFF in
a) Microsecond
c) Nanosecond
A LED emits lights only
a. Forward biased
c. Un biased
How many diodes are used for the full wave
rectification is
a) Two
c) Four
a. Increases under forward bias
b. Is independent of applied voltage
c. Increases under reverse bias
d. None of these
61.
b) Milli-ampere
d) None of these
XOR gate is combination of
a. AND, OR and NOT gate
b. NAND, OR and NOT gate
c. NOT, AND and OR gate
d. NOT, AND and NOR gate
59.
The reverse or leakage current of the diode is of
the order of
71.
The electronic circuits which implement the
various logic operations are known as
a) Digital gates
c) Voltage operated gate
72.
b) Logic gate
d) All of them
A diode characteristic curve is a plot between
a) Current and time
b) Voltage and time
c) Voltage and current
d) Forward voltage and reverse voltage
NAND gate is a combination
38
73.
In a half-wave rectifier the diode conducts during
3.
Which of the following radiations has the greatest
photon
a) Both halves of the input cycle
b) A portion of the positive half of the input cycle
c) A portion of the negative half of the input cycle
d) One half of the input cycle
a) TV waves
c) X-rays
4.
74.
Linear momentum of a photon is
The output of a two inputs OR gate is O only
when its
a) Both inputs are O
c) Both inputs are 1
75.
b) Either input is 1
d) Either input is zero
b) Microwaves
d) γ - rays
b) Hf/c2
d) c2/hf
a) Zero
c) hf/c
5.
The linear momentum of an x-ray photon of
wavelength 0.1Ao is
For typical transistor as an amplifier
Vout
R
 C
Vin
Rie
Vout
R
c)
  ic
Vin
Rc
a)
76.
Vout

Vin
Vout
R
d)
  ie
Vin
Rie
a)
b)
c)
d)
b)
6.
Stopping potential for a metal surface incase of
photo electric emission depends on
a) The threshold frequency for the metal surface
b) The intensity of incident light
c) The frequency of incident light and the work
function for metal surface
d) None of these
The resistance between (+) and (-) of ideal
Op-Amp is
a) High
c) Infinity
77.
b) Low
d) Moderate
Temperature, pressure etc are converted into
electronic informations by devices called
a) LEDs
c) Vacuum tubes
6.625 x 10-23 NS
66.25 x 1023 NS
662.5 x 1023 NS
Data is insufficient
7.
Select an alternative form of uncertainty principle
from the following
b) Sensors
d) None
a.
c.
8.
h/moca
mc2 = hf
b.
d.
E. t  h
any of the above
The existence of ether wind was experimentally
rejected by
a) HeisenbergEinstein b) Michelson and Morely
d) De-Broglie
d) None
CHAPTER 19
DAWN OF MODERN PHYSICS
1.
An observer shoots parallel to a meter stick at
very high speed (relativistic) and finds that the
length of meter stick is __________
a)
b)
c)
d)
2.
9.
Greater than one meter
Less than one meter
One meter
None of these
a)
b)
c)
d)
10.
0.001 Kg mass will be equivalent to
a) 2.5 GWh
c) 0.26 GWh
b) 25 GWh
d) 250 GWh
As the temperature of black body is
raised, the wavelength corresponding to
maximum intensity
Shifts towards longer wavelength
Shifts towards shorter wavelength
Remains the same
Shifts towards shorter as well as longer
wavelength
Rest mass of photon is
a) Infinite
c) Very small
11.
b) Zero
d) Very large
The name of photon for quantum of light was
proposed by
39
a) Ampere
c) Thomson
12.
a) The minimum kinetic energy of the photo
electrons increase
b) The minimum kinetic energy of the
photoelectrons decrease
c) The minimum kinetic energy of the
photoelectrons increase
d) The average kinetic of the photoelectrons
decrease
b) Planck’s
d) Einstein
A photon is a ____________
a.
b.
c.
d.
13.
Unit of energy
Positively charged particle
Quantum of electromagnetic radiations
Unit of wavelength
18.
Which one of the following has the largest energy
content?
a) Zero
a. 103 photons of wavelength 2pm (Y-rays)
b. 102 photons of wavelength 1mm (X-rays)
c. 106 photons of wavelength 50mm
(Infrared)
d. 106 photons of wavelength 200mm (UV)
14.
A transmitting station emits radio waves of
wavelength  at power p. if h is plank’s constant
C the speed of light, what is the rate of emission
of photon?
a) pc/h 
c) p  /hc
15.
a.
b.
c.
d.
c)
19.
Increase because wave light decrease
Decease because speed decrease
Remains same
Increase then decrease
c.
20.
In a photo electronic effect, monochromatic
light, is incident on a metal surface. If the
incident light of twice the intensity but the
same wave length, the kinetic energy of the
emitted electron ______
a) Becomes double
b) Remains same
c) Becomes half
d) First increase then decreases
because curvilinear graph.
17.
If the wave length of incident radiation is
increase in photo emission, then _________
c.
22.
d) Ft

nh

b.
Zero
d.
2nh

nft
5.53 x 10-36 kg
0 Kg
2.46 x 10-36 kg
1.84 x 10-44 kg
2h
m
2mc 2
h
b.
d.
mSc 2
h
h
m
In Davison – Germer experiment, the
diffracted proton from crystal shows
____________
a) Particle property
c) Light property
23.

The velocity of particle of mass m of deBroglie wave length  is ________
a.
16.
h
A photon of wave length 900mm behaves like
a particle of mass ________
a.
b.
c.
d.
21.
h
b) 2
If n number of photon are striking on a metal
surface, then the total momentum exerted is
______
a.
b) hc/p 
d) ph/ck
After traveling through a vacuum, a photon of
light entering into some transparent denser
medium. Thus the energy of light _________.
If a photon is reflected from the mirror, then
the change in momentum of each photon is
________
b) Wave property
d) Quantum property
If a diffracted grating is placed in the path of a
light beam, it revels ______
a. Wave property
b. Particle property
c. Energy particle
40
d. Electromagnetic wave property
24.
In electron microscope, electric and magnetic
field are used as _______
a.
b.
c.
d.
25.
28.
Electron microscope
Scanning electron microscope
Magnetic imaging
None of the above
b. Position
d. Neutron
33. The reverse process of pair-production is
a. Annihilation
c. Fission
b. Materialization
d. Fussion
34. The decrease in length with speed was explained
by
Property of matter and radiation
Two dimensional motions
Emotion of certain wave length
Very high velocity
a. Einstein
c. Bohr
b. Lorentz
d. None
35. The famous Michel-son-Morely experiment
proves that
a. Light is energy
b. Earth rotates about its axis
c. Ether medium does not exist
d. None
107m/sec
Should be greater than speed of light
Be zero
Not be wave link
36. All the motion in this universe are
a. Absolute
c. Variable
Karl-wein’s laws
Raleigh jeans law
Stephens law
Planck’s
b. Uniform
d. Relative
37. On a hot day white clothes are cold because they
are
a. Reflective
c. Radiators
b. Absorbers
d. None
Compton effect proves the _______
38.
a.
b.
c.
d.
30.
b. 2.6 × 108 m/sec
d. None
The anti-particle of electron is
a. Proton
c. Meson
The energy radiated is directly proportional to
fourth power of Kelvin’s temperature is _____
a.
b.
c.
d.
29.
32.
For confinement of electron in a box of radius
10-14 m. the electron speed should be ____
a.
b.
c.
d.
The mass of an object will be doubled
at speed
a. 1.6 × 108 m/sec
c. 2.6 × 107 m/sec
Electromagnetic gun
Source of electromagnetic waves
Deflected charged particle
Converging source of electrons
The uncertainty in momentum and position is
due to its ___________
a.
b.
c.
d.
27.
31.
A three dimensional image is obtained by
______________
a.
b.
c.
d.
26.
d. S.H.M like sound
Photon theory of light
Deal nature of light
Wave nature of light
Uncertain nature of light
Electron moves in the orbit as ______
a. Simple vibratory motion
b. Standing wave motion
c. Vibratory motion like up and down
The radiation emitted by human body lies in the
range of
a. Infrared region
c. Visible region
39.
b. U.V region
d. None
The energy emitted is directly proportional to
fourth power of temperature is
a. Lummer Law
c. Wein’s Law
b. Stephen – Boltzman Law
d. None
41
40.
Wein’s displacement law holds good for
a. Short wavelength
c. All wavelength
41.
42.
44.
b. 1.24oA
d. None
54.
b. 1930
d. None
56.
a. 10.2 Mev
c. 102 Mev
b. 1.02 Mev
d. None
57.
Photo electric effect for visible light can be obtain
from
a. Sodium – Potassium
c. Helium – Neon
49.
b. Rectifier
d. Photo – cell
59.
b. 1.38 × 10-3 m.k
d. None
b. Pair-production
d. None
If work function is 4.14ev, the threshold frequency
of incident light is
b. 1013Hz
d. 1015Hz
Each quantum is associated with radiation of
a. Intensity
c. Frequency
b. Carbon – oxygen
d. None
Sound tracks of movies can be controlled by
a. Diode
c. Amplifier
58.
b. Very low
d. None
The reverse process of Photo-electric effect is
a. 1012Hz
c. 1014Hz
48.
b. Electron micrograph
d. None
The value of Wein’s Constant is
a. Compont Effect
c. Annihilation
The minimum energy required for pair production
is
b. 1.09 × 10-20J
d. None
At stopping potential current passing through
circuit is
a. 2.9 × 10-3 mol .k
c. 3.51 × 10-3 m.k
b. Moon
d. None
b. 1923
d. 1919
The photograph taken by electro-microscope is
called
a. Mini
c. Zero
55.
b. Plank’s Law
d. None
The life time of an electron in an excited state is
10 -6 sec. What is uncertainly in energy for this
time?
a. Photograph
c. Chronograph
The anti-particle of earth is
a. Sun
c. Black hole
47.
53.
is
A. H Compton was awarded Nobel Prize in
Physics in
a. 2.35 × 10-20J
c. 1.05 × 10-26J
The concept of antimatter was predicted
theoretically by Dirac in
a. 1928
c. 1935
46.
52.
b. Space
d. None
b. Water
d. Vacuum
 MaxT  Contt.
a. 1927
c. 1921
The wavelength of photon with energy of 16 × 10
-19 J is
a. 12.4oA
c. 124oA
45.
51.
Pair production cannot possible in
a. Air
c. Glass
The relation
a. Wein’s Law
c. Stephen Law
b. Large wavelength
d. None
According to special theory of relatively the 4th
variable is
a. Time
c. Speed of light
43.
b. Large wavelength
d. None
Plank’s theory is hold good for
a. Short wavelength
c. All wavelength
50.
b. Energy
d. None
Loius Broglie give the idea of Matter – wave in
a. 1924
c. 1926
b. 1925
d. 1928
42
68.
60.
C
A passenger passes a clock with a speed
.
2
a) 10-6eV
c) 10-10eV
The time period observed by him is:
61.
a)
t  t
c)
t
3
t
2
2
d) t 
t
5
The threshold frequency of metals is 2 × 10-4Hz.
The work function of metal is
a) 13.26 × 10-38ev
c) 13.26 ev
62.
The wavelength associated with electron moving
with speed 5.6 × 106 m/s is
b) 0.12nm
d) 120nm
71.
b) 10-48N-S
d) 10-20N-S
b) Relative
d) None of these
74.
65.
A quantity
1
2
v
is always
c2
a) Greater than one
c) Equal to one
66.
The equations of pair production is
Louis De Broglie received Nobel prize in physics
in
a) 1926
c) 1925
75.
At higher temperature, the body emits long
wavelength in the region
a) Infra red
c) Far-infra red
67.
b) Less than one
d) None of these
b) Momentum
d) None of these
a) hf = 2moc2 – KE(e-) + K.E (e+)
b) hf = 2moc2 + KE(e-) + K.E (e+)
c) hf = 2mo2c2 + KE(e-) + K.E (e+)
d) hf = 2mo2c + KE(e-) + K.E (e+)
The concept of position is purely
a) Specific
c) Ordinary
b) Photo transistor
d) None of these
In Compton effect, the law/laws are conserved
a) Energy
c) Both
73.
b) Max Planck
d) None of these
Application of photoelectric effect is
a) Photo diode
c) Photocell
72.
b) Different
d) None of these
The idea of quantization of energy was proposed
by
a) Einstein
c) Compton
The uncertainty in position of electron is 6.63Ao.
The uncertainty in momentum of electron is
a) 10-24N-S
c) 10-16N-S
64.
70.
b) 10-4eV
d) 10-12eV
The stopping potential when intensity is kept
constant is
a) Same
c) Both a & b
b) 13.26 × 10-38J
d) None
a) 12nm
c) 1.2nm
63.
69.
b)
2
t
3
The energy of photon of radio waves is only
about
b) 1922
d) 1929
The high energy electrons penetrate the
specimen to reasonable thickness and acquire
sufficient energy due to its
a) Short wavelength
b) Extremely short wavelength
c) Long wavelength
d) None of these
b) Ultraviolet
d) None of these
The Stefen-Boltzmann has the value
a) 5.67 × 10-5Wm-2K-4
b) 5.67 × 10-6Wm-1K-4
c) 5.67 × 10-6Wm-2K-4
d) 5.67 × 10-8Wm-2K-4
76.
The best optical resolution is made by the
microscope is
a) 0.1 μm
c) 0.3 μm
b) 0.2 μm
d) None of these
43
77.
In Compton effect

is always
a) Less than 
c) Equal to 
78.
b) Greater than 
d) None of these
4.
5.
12.3 V A
2 
c) 12.3 / V A
b) 12.3 / VA

In obtaining an x-ray photograph of our
hand, we use the principle of _______
Excited atoms return to their ground stat
in __________
a) 10-10S
c) 10-6S
An electron accelerated through a P.D, V has a
wave associated with it of wavelength
a)
b. Pfund series
d. Bracket series
Photo electric effect
Ionization
Shadow photograph
Any of above
Photon ‘A’ has twice the energy of photon ‘B’.
What is the ratio of the momentum of ‘A’ to that of
‘B’?
b) 2 : 1
d) None
b. 2nd to 5th orbit
d. 4th to 5th orbit
In Hydrogen spectrum, which one of the
following series lies in the ultraviolet
region?
a. Ballmer series
c. Lyman series
b) Time
d) None
a) 4 : 1
c) 1 : 2
82.
3.
b. 1836
d. 183.60
Photon of high frequency will be
absorbed when transisation takes place
from _________
a. 1st to 5th orbit
c. 3rd to 5th orbit
b) Momentum
d) None of these
Which of the following has the same dimension
as h/moc?
a) Length
c) Mass
81.
b) De-Broglie
d) None of these
Can pair production takes place in vacuum
because of conservation of
a) Energy
c) Momentum & Energy
80.
2.
Who discovered the idea of Ether?
a) Schrodinger
c) Michelson and Morley
79.
a. 183.336
c. 18360.00
6.
d) None
b) 10-8S
d) 10-9S
When we excite some atoms by heat
collusion or electrical discharge, they will
______
a. radiate electromagnetic energy with a
continues distribution of wavelength
b. Absorb particular wavelengths when
white light is incident an them
c. Radiate electromagnetic energy of
discrete charactristic wavelength
d. Emit either invisible or visible light
7.
Hydrogen atom does not emit x-rays
because __________
a. Its energy level are too close to each
other
b. Its energy level are too far apart
c. It is too small in size
d. It has a single electron
CHAPTER # 20
ATOMIC SPECTRA
1.
Ratio of the weight of H-atom to that of
an electron is approximately ________
8.
Which one of following postulate is in
accordance with the Rutherford’s model?
a. Continues spectra for atoms
44
b. Discrete spectra for atoms
c. Either continues for atoms
d. No spectrum
a. Pair production
c. Animation of matter
18.
9.
19.
b. 3.40eV
d. -1.51eV
20.
21.
a. Bound spectrum
b. Line spectrum
c. Continuous spectrum d. Absorption spectrum
13.
The electric P.E of an electron is an orbit
at a distance from the positive charge
________
a. Ke2/rn
c. –ke2/rn
14.
a. Ultraviolet rays
c. Infrared radiation
15.
a. 4th orbit
c. 3rd orbit
16.
The penetrating power of X-rays is
comparable with that of __________
b. β - rays
d. All of above
Quality of X-rays depends upon _______
a. Filament current
b. Accelerating voltage
c. Material of the target
d. b and c
23.
Radiation produced from T.V. picture
tube is _________
a. γ - rays
c. Far infrared
24.
b. 5th orbit
d. 2nd orbit
In an electronic transisation, atom cannot
emit _________
a. γ - rays
c. Visible light
17.
22.
b. X-rays
d. Visible radiations
Bracket series is obtained when all
transition of electron terminate on _____
When X-rays are passed through
successive aluminum sheets, what
happens to their thickness?
a. α - rays
c. γ - rays
b. Ice2/rn2
d. –ke2/rn2
Radiation with wavelength longer than
red light________
b. Frequency
d. All of the above
a. In increases
b. It decreases
c. Remains same
d. Sometimes increase sometimes
decreases
b. Four
d. Six
The radiations emitted from hydrogen
filled discharge tube show _________
b. Positive rays
d. α - rays
The penetrating power of X-ray depends
on their ____________
a. Applied voltage
c. Source
Total number of series in hydrogen
spectrum is _____________
a. Three
c. Five
12.
a. Cathode rays
c. γ - rays
Ground state energy of the 4th orbit in a
H-atom is ________
a. 13.60eV
c. 0.85eV
11.
X - rays are similar in nature to _______
X-rays are ___________
a. Unknown nature
b. High energy electrons
c. High energy photon
d. Radioisotopes
10.
b. Compton effect
d. X-rays production
b. X - rays
d. Infrared
In an X - ray tube, electrons each of
charge e are accelerated through V
potential difference allowed to hit a metal
target, the wavelength of the X-rays
emitted is ____
a. hc/ev
c. ev/h
b. he/vc
d. impossible to predict
b. Infrared radiation
d. Ultraviolet rays
Reverse process of photo electric effect
is __________
25.
The minimum wavelength of X-rays can
further be reduced by _________
45
m and de-Broglie Wavelength?
a. Reducing the pressure of cooling the target
b. Increasing the temperature of the filament
c. Using a target element of higher atomic
number
d. Increasing the potential difference b/w
the cathode and the target
26.
b. 9.1 x 10-18m
d. 4 x 10-10m
29.
31.
34.
Electron cannot exist in the nucleus, it is
confirmed by observing that __________
In normal state of energy, the incident
high energy photons will be _________
a. Stimulated
b. Absorbed
c. Cause X-rays emission
d. Cause laser production
35.
In laser production, the state in which more
atoms are in the upper state then in the lower one
is called _________
a. Metal stable state
c. Inverted population
36.
37.
b. 10-5 sec
d. 10-8 sec
In He – Ne laser, the lazing action is
produced by __________
a. Ne only
c. Electrons of He
38.
b. Normal state
d. All the above
The meta stable state for an atom in laser light is
_____________
a. 10-4 sec
c. 10-3 sec
UV radiation can be produced by
__________
a. Heating the filament
b. Ionization of atoms
c. Electron excitation in the gas
d. All the above
Wave like characteristic of electron is
demonstrated by _________
a. At does emit Y-radiation
b. Its size as compare to proton and neutron is
very small
c. No antiparticle of electron is present
d. The velocity of electron must by very high
according to uncertainly principle
X-rays are diffracted by a crystal but not
by a diffraction grating because ______
a. The ions in a crystal are well arranged
b. The lines in a diffraction grating cannot
reflect X-rays
c. The perpetrating power of x-rays is
which in a diffraction grating
d. The wavelengths of x-rays are of same
order of magnitude as the separation
between atoms in a crystal
30.
33.
Maximum frequency in the spectrum
from x-rays tube is directly proportional to
the ___________
a. Number of electron i.e. filament current
b. The kinetic energy of incident electron
c. The soft target which can easily emit electron
d. All the above are correct
b. 2h/mλ
d. (2hc/mx)½
a. Line spectrum of atoms
b. Production of X-rays
c. Diffraction by crystalline solids
d. Photo electric effect
The minimum wavelength of X-rays
produced by the bombardment of
electron on the screen of a T.V. set
where the accelerating potential is 2.0
K,V will be ________
a. 6.2 x 10-10m
c. 3.11 x 10-10m
28.
32.
The characteristic X-rays spectrum is due to ____
a. The illumination of the target metal by
ultraviolet radiation
b. The bombardment of the target by proton
c. The bombardment of target by electron
d. The absorption of Y-radiation by the target
metal
27.
a. h/mλ
c. Mh/h
b. He – Ne both
d. Electrons of Ne
Reflecting mirrors in laser is used to ________
a. Further stimulation
b. Lasing more
c. For production more energetic laser
d. All the above
What is the velocity of a particle of mass
46
39.
The velocity of laser light is __________
49.
a. Less than ordinary light
b. More than ordinary light
c. Equal to ordinary light
d. Different for different colors or frequency
a. X – rays
c. Spectrum
50.
40.
Laser beam can be used to generate
51.
According to Bohr’s theory the outer orbit
Electron has ________ energy than inner
orbits.
a. small
c. very large
a. Greater
c. Equal
b. large
d. None
The value of Rydberg’s constant is
16
RH
c. 16 RH
b.
47.
55.
d. None
b. He – spectrum
d. None
b. Mari – curie
d. Lane
The idea of laser was first introduced in
1958 by
a. Frank – white
c. Dr. Gilbert Young
b. C.H.Towner
d. C.H.Towner
The ionization energy of H – atom is
The ratio of volume of an atom to the
volume of nucleus is
a. – 13.6ev
c. ±13.6ev
a. 103
c. 109
b. 13.6ev
d. none
Which one of the following is more coherent
57.
58.
b. Line spectrum
d. none
b. 106
d. 1012
The value of Plank’s constant is
a. 6.63 × 10-34 J.sec
c. 6.63 × 10-34 sec/J
b. Normal light
d. γ – rays
Sunlight spectrum is
a. Discrete
c. Continuous spectrum
56.
b. Chadwick
d. Stony
X – rays was discovered by
a. Bacquerel
c. Roentgen
Bohr’s theory is failed to explain
a. X – rays
c. Laser
48.
54.
b. Smaller
d. None of these
The name of electron was suggested by
a. Rutherford
c. Thomson
RH
16
a. H – spectrum
c. Complex atoms spectrum
46.
53.
b. 1.0794 × 107m-1
d. None
The shortest wave length radiation in
Bracket series has wavelength
a.
45.
b. – ive
d. None
Bremsstrahlung is phenomenon in which
the rate of slowing down of electron is
a. 1.0974 × 107m-1
c. 1.0974 × 10-7m-1
44.
The total energy of electron in an orbit
around the nucleus is
a. + ive
c. zero
b. γ – rays
d. none
52.
43.
b. 80 – 20%
d. None
X – rays is also know as
a. photon
c. breaking radiation
42.
b. Laser
d. None
A common He – Ne gas laser contain,
He – Ne ration
a. 85 – 15 %
c. 70 – 30%
a. One dimensional images
b. Two dimensional images
c. Three dimensional images
d. None of these
41.
Optical pumping exist in
b. 6.63 × 10-34 J/sec
d. None
Laser is a device which can produce
a. an intense beam of light
b. Coherent light
c. Monochoromatic light
d. All
47
59.
The total energy of electron in state n = α
is
a. + ive
c. zero
60.
61.
b. – ive
d. None
When magnetic field is applied in the path X –
rays , they will be moving in
a) Straight line
c) Parabolic path
69.
With the help of laser beam we can produce
70.
72.
The quantized energy of first Bohr orbit of
hydrogen atom is
b) – 13.6 eV
d) 13.5 eV
In Laser a Meta-stable state is
The Meta-stable state of Helium and Neon is
a) Different
c) Nearly identical
73.
b) Identical
d) None of these
Laser beam can be used for
a) Wilding of detached retinas
b) Destroy tissues in a localized area
c) Sealed off capillaries for prevention of disease
d) All of them
Bremsstrahlung are those in which radiations are
produced of
a) Long wavelength
b) Short wavelength
c) Wavelength in X-rays region
d) None of these
67.
b) Large
d) None of these
a) An excite state
b) In which an electron is usually stable
c) In which an electron reside 10-3 sec
d) None of these
Line spectra is an example of
a) 13.04 eV
c) 13.6 eV
66.
X – rays can cause cancer in living cells due to
radiation exposure which is
Continuous spectra is an example of
a) Atomic
b) Molecular
c) Black body radiation d) None of these
65.
Computerized axial tomography (CAT-scanner) is
a system in which X – rays are
a) Small
c) Excessive
71.
64.
b) Several millimeter
d) Several centimeter
a) Maximum through the subject
b) Minimum absorptions through the subject
c) Depending upon the subject
d) None of these
a) Atomic
b) Molecular
c) Black body radiation d) None of these
63.
X – rays can penetrate into a solid matter upto
a) Few millimeter
c) Few centimeter
b) Circular path
d) None
a) Fusion reaction
b) Holograms
c) Fragment of kidney stone
d) All of these
62.
68.
74.
In Balmer series the shortest wavelength
radiations have wavelength equal to
In LASER principle, a photon produce another
photon by the process of
a)
 RH

 4

m

b)
 4

 RH
a) Excitation
c) Ionization
c)
 RH 

m
 9 
d)
(9RH ) m
b) De-excite
d) None of these
Characteristic X – rays are the X – rays which
have
a) High energy photons
b) Specific wavelengths
c) Specific frequencies
d) All of these
75.

 m

The longest wavelength radiations in Braket
series have wavelength equal to
a) 
25
RH
16
b)
16
RH
25
48
c)
76.
135
27 R H
d) None
The wavelength of X – rays produced due to
declaration of electrons is
Ve
a)   
m
h
c)  
V e
he
b)  
V e
Ve
d)   
h
Chapter 21
NUCLEAR PHYSICS
1.
In nucleus of uranium the number of neutrons will
be ___________
a.
b.
c.
d.
2.
During fusion of hydrogen into helium _______
a.
b.
c.
d.
3.
92
235
143
Different for different isotopes
Energy is absorbed
Energy is released
Mass is increased due to energy absorption
Mass is reduced due to energy absorption
One a.m.u is equal to _________
a) 1.66 x 10-27 kg
c) 1.66 x 10-20 kg
4.
According to which one of following law,
the density of atom is uniform ?
a) J.J. Thomson
c) Bohr’s Model
5.
90
Greater than the critical size
Less than the critical size
Equal to critical size
Antimatter consists of _____________
a) Antiproton
c) Positron
7.
b) Antineutron
d) All of above
Neutron and proton are commonly known as
____________
a) Nucleons
c) Boson
8.
b) Rutherford’s Model
d) All of above laws
For chain reaction to buildup, the size of
the radio active target should be ______
a.
b.
c.
d.
6.
b) 1.66 x 10-25 kg
d) All of above
b) Meson
d) Quartz
Half life of Radium is 1590 years. In how
many years shall the earth loss all his
radium due to radioactive decay ?
49
d) Moderator reflect the neutron
a) 1590 x 106 years
c) 1590 x 1025 years
b) 1590 x 1012 years
d) Never
The bombardment of nitrogen with α - particles
will produce ________
17.
a) Neutron
c) Electron
9. Which one of the following radiation
possesses maximum penetrating power?
a) α - rays
b) β - rays
c) γ - rays
d) All have equal penetrating power
10.
11.
Can exist inside the nucleus
Cannot exist inside the nucleus
Can exist both inside and outside the nucleus
Don’t know
Spontaneous activity
Chemical property
Self disintegration property
Both a and c
19.
20.
b) 40 Mev
d) 20 Mev
Average energy required to remove one nucleon
from the nucleus is called _____
a)
b)
c)
d)
21.
Binding energy per nucleon
Energy of decay
Destruction energy
All of above
Fission chain reaction in a nuclear reactor can be
controlled by introducing ________
a) Iron rod
c) Cadmium rods
22.
b) Graphite rods
d) Platinum rods
Which one of the following possesses
maximum velocity?
a) α - rays
b) β - rays
c) γ - rays
d) All of the above have same speed
b) Greater than 82
d) Greater than 102
Nuclear force exist between
23.
a) Proton – proton
c) Neutron – Neutron
b) Proton – Neutron
d) All of the above
Charge on an electron was determine by ______
a) Ampere
c) Milliken
b) Maxwell
d) Thomson
Mass defect per nucleons is _________
24.
a.
b.
c.
d.
16.
b) N = Noext
d) No = N(Iext)
Transuranic elements have atomic number ____
a) Greater than 72
c) Greater than 92
15.
b) 10-11 m
d) 10-14 m
Radioactive decay obeys which one of the
following data?
a) N = Noe-λt
c) N = Noe-xt/2
Energy liberated when one atom of U-235
undergoes fission reaction is ______
a) 200 Mev
c) 30 Mev
14.
a) 10-12 m
c) 10-10 m
Radioactivity is a ______________
a)
b)
c)
d)
13.
Diameter of an atom is approximately _______
Electrons
a)
b)
c)
d)
12.
18.
b) Proton
d) Positron
Binding energy of nucleus
Packing fraction
Average energy of nucleus
All of above are one & same thing
Charge on neutron is _____________
a)
b)
c)
d)
+1.6 x 10-19c
-1.6 x 10-19c
Zero
No definite charge
Tick the correct statement
25.
a) Moderator slow down the neutron
b) Moderator bring the neutrons to rest
c) Moderator absorb the neutron
A particle having the mass of an electron and the
charge of a proton is called
a) Antiproton
b) Positron
50
c) Gamma rays
26.
d) Photon
a) 92U235
c) 92U234
Mass of neutron is ____________
a) 1.67 x 10-13 Kg
c) 9.1 x 10-31 Kg
b) 1.67 x 10-27 Kg
d) 1.67 x 10-19 Kg
34.
Radioactive materials can be identified by
measuring their_______
a) Hardness
c) Mass
27.
Nuclei having the same mass number but
different atomic number are ______
a) Isotopes
c) Isotones
28.
35.
b) Isobars
d) Isomers
A mass spectrograph sorts out _______
a) Molecules
c) Elements
29.
b) Ions
d) Isotopes
Sum of the masses of constituent nucleons as
compared to the mass of the resultant nucleus is
_______
a)
b)
c)
d)
Smaller
Greater
Same
Some times smaller some times greater
a)
b)
c)
d)
37.
An α - particle is emitted from 88Ra226,
what is the mass and atomic number of
the daughter nucleus?
30.
31.
a)
b)
c)
d)
32.
a)
b)
c)
d)
33.
Atomic Number
84
80
86
87
The unit of Radioactivity “Curie” is equal to
___________
3.74 x 109 disintegration per sec
3.70 x 1010 disintegration per sec
3.55 x 1010 disintegration per sec
3.60 x 1010 disintegration per sec
In liquid metal fast breeder reactor, the type
of uranium used is _______
During an encounter with an atom α - particle
knocks out _______
40.
b) Carved
d) Elliptical
Which one of the following radiations are
suitable for the treatment of an infection in
the interior body?
b) β - rays
d) X - rays
Various types of cancer are treated by
___________
a) Cobalt 60
c) Carbon 14
41.
b) Electrons
d) Nothing
The path of B-particle is_________
a) α - rays
c) γ - rays
During fission process, a large amount of
_____________
Heat energy is released
Nuclear energy is released
Chemical energy is released
Light energy is released
Net energy is conserved
Net charge is conserved
Net momentum is conserved
All of the above
a) Rectilinear
c) Zigzag or erratic
39.
b) Fusion reaction
d) Chemical reaction
Pair production takes place in the vicinity of
heavy nucleus so that __________
a) Protons
c) Neutrons
38.
Mass Number
a.
224
b.
220
c.
222
d.
226
b) Density
d) Half life
If one or more of the neutrons emitted during
fission can be used to build up further fission
then the reaction is self sustained and is
known as ________
a) Fission reaction
c) Chain reaction
36.
b) 92U238
d) 92U239
b) Strontium – 90
d) Nickel – 63
Sterilizations of surgical instrument, medical
supplies and bandages can be done by
exposing them to a beam of _________
a) α - rays
51
b) β - rays
c) γ- rays
d) ‘b’ & ‘c’ have equal antiseptic properties
42.
Charge on α - particle is _________
a) +1
c) -2
b) +2
d) -1
c) Mass
51.
d) Momentum
CFC is used in ____________
a) Refrigerator
c) Plastic foam industry
52.
Average distance covered by α - particle in
air before its ionizing power ceases is called
its __________
a) Trajectory
c) Firing level
43.
44.
Through direct collision
Through electrostatic attraction
Through electrostatic repulsion
All of above
T.V. sets and microwave oven emit ______
a) X - rays
c) β - rays
45.
a)
b)
c)
d)
54.
b) α - rays
d) γ - rays
A β - particle in a single encounter _______
55.
Charge on B-particle is __________
a) +1
c) +2
b) α - particle source
d) Neutrons source
The penetration power of β - particle as
compared to a-particle is_______
b) 100 times more
d) 10 times less
b) -1
d) -2
Why γ - rays are used to kill bacteria, to
sterilize surgical equipments etc?
a) Chargless
c) Highly penetrating
58.
b) Massless
d) All of above
B-particle ionizes an atom ________
Geiger counter is suitable for ______
a) Fast counting
c) Slow counting
b) Extremely fast counting
d) All situations
A α - particle can produce fluorescence in
___________
a) Zns
c) Calcium tunzstate
50.
b) Heat waves
d) X - rays
Strontium -90 is used as _________
a) 10 times more
c) 100 times less
49.
b) I -131
d) C -14
γ - rays are electromagnetic waves like
____________
a) Normal light
c) Micro waves
57.
48.
b) β - rays
d) Neutron
The most useful tracer is ________
a) Sr -90
c) Ca -41
Loses a small fraction of its energy
Loses most of its energy
Loses no energy at all
Loses energy at all
a) β - particle source
c) γ - particle source
47.
Which one of the following possesses greater
penetrating power?
a) α - rays
c) X-rays
56.
46.
b) Range
d) Limit
B-particle ionizes an atom ________
53.
a)
b)
c)
d)
b) Aerosol spray
d) All of above
b) Barium Palatino cyanide
d) All of above
Pair production cannot take place in vacuum
as ______ is not conserved
a) Energy
a)
b)
c)
d)
59.
a)
b)
c)
d)
Due to electrostatic force of attraction
Due to electrostatic force of repulsion
Due to direct collision
Due to gravitational force
B-particles possess greater penetration
power then that of a-particle due to its
____________
Smaller ionization power
Energy is not conserved
Neither greater nor smaller ionization power
Same ionization power
b) Charge
52
60.
Pair production can take places only with
______________
a) Uranium and Polonium
b) Polonium and Radium
c) Radium and Uranium
d) Uranium and Plutonium
b) γ - rays
d) IR-rays
a) X-rays
c) UV-rays
69.
61.
A device for producing high velocity nuclei is
___________
a) Cloud chamber
c) A mass spectrograph
b) Linear acceleration
d) Wilson cloud
The half of uranium – 238 is
a) 1.67 × 108 years
c) 4.5 × 108 years
70.
b) 3.3 × 109 years
d) 4.5 × 109 years
The  - particle ionizes the particles in its way and
adopt the path which is
a) Curved
c) Zig – Zag
62.
Which one of the following will be better
shield against γ - rays?
a) Ordinary water
c) Lead
63.
64.
Z
A
Neutron produce ionization by knocking out proton
which is
b) Indirect ionization
d) None of these
 - rays are absorbed by a sheet of
75.
Tracks obtained by
Chamber is
b) 1 ~ 10 mm of lead
d) None of these
 - particles in Wilson Cloud
a) Strong Continuous
b) Discontinuous, not straight thin
c) Weak and no definite tracks
d) None of these
76.
The mixture of gas filled in a Geiger-Muller tube at
atmospheric pressure at about
Both Xenon and Cesium each have isotopes
a) 12
c) 36
a) 0.01 mm of Hg
c) 10.00 mm of Hg
b) 33
d) 39
77.
68.
b) Proton
d) None of these
a) 1 ~ 5 mm of lead
c) 5 ~ 10 mm of lead
Z 1
b) Antineutrino
d) None
Neutron interact with materials containing hydrogen
atoms and knock out
a) Direct ionization
c) Both
 X      .......  Q
a) Neutrino
c)  - particle
67.
73.
Complete the reaction
X
b) Very easily
d) None of these
a) Electron
c) Photon
74.
a) Increase with magnitude of increasing
charge
b) Decreases with magnitude of increasing
charge
c) Is independent of charge
d) None
66.
72.
b) β - rays
d) γ – rays
Strong nuclear force
 - particles can be deflected by collisions than the
 -particles is
a) Difficult
c) Easily
b) 5 rem per week
d) 3 rem per week
Radiations are used for the treatment of skin
of a patient is __________
a) α - rays
c) X - rays
65.
b) Heavy water
d) Aluminum
The maximum safe limit does for persons
working in nuclear power station are
__________
a) 1 rem per week
c) 4 rem per week
71.
b) Straight
d) None of these
Marie Curie and Pierre Curie discovered two new
radioactive elements which
b) 0.1 mm of Hg
d) None of these
The quenching of gas by a quenching gas is called
a) Quenching
b) Self quenching
53
c) Forced quenching
78.
d) None of these
The dead time of Geiger Muller counter is of the
order of
a) Electrons
c) Neutrons
88.
a) Micro second
b) Miilli second
c) More than millisecond d) None of these
79.
As the solid state detector absorbs so less energy
of the incident particle and junction become from
surface. So it is called the detector as
a) Surface contact
c) Surface dependent
b) Surface barrier
d) None of these
b) Protons
d) None of these
Subatomic particles are divided into
a) Photons
c) Hadrons
89.
b) Leptons
d) All of these
Hadrons are the particle included
a) Protons
c) Mesons
90.
b) Neutrons
d) All of these
Lepton’s particles which experience no strong
nuclear force are
a) Electrons
c) Neutrinos
80.
The solid state detector operated at
91.
a) Low
c) Very High
b) High
d) None of these
The breakage of
U produces the fragments as
92
a) Kr and Ba
c) Xe and Sr
82.
83.
b) Sn and Mo
d) All of them
b) Uranium – 233
d) All of these
b) 1100oC
d) 1300oC
93.
94.
b) Fast neutron
d) None of these
86.
87.
b) Blindness
d) All of them
Neutrons are particularly more damaging to
a) Legs
c) Eyes
b) Greater
d) None
If a radioactive isotope of silver have a half life of
about 7.5 days. After 15 days the remaining isotope
of its original is
A nuclide
b) 50%
d) 15%
86
R 220 decays to a new nuclide by two
 -emissions, the nuclide S is
Ultraviolet radiation cuase
a) Sum burn
c) Skin Cancer
Fission nuclear reaction leads to a _____ stability.
a) 25%
c) 7.5%
95.
85.
Meson is made from
a) Lesser
c) Medium
Plutonium can be fissioned by
a) Slow neutron
c) Very slow neutron
b) Half unit
d) None of these
a) A pair of quarks
b) A pair of anti quarks
c) A pair of quarks and anti quarks
d) None of these
The temperature of the core of the reactor rises to
about
a) 1000oC
c) 1200oC
84.
92.
The fuel / fuels used in the reactor are nowadays
a) Plutonium – 239
c) Uranium – 235
The charges on the quarks are
a) One unit
c) Fraction
235
81.
b) Muons
d) All of these
a)
84
S 212
b)
c)
80
S 220
d) None
82
S 212
b) Heart
d) Brain
Radio isotopes can be made easily by
bombardment with
54