Download l.sc100 vasco gcet mock test

GCET MOCK TEST IN PHYSICS 2016
1. Which of the following has the longest
de-Broglie wavelength if they are
moving with the same velocity?
a) Alpha particle
b) Beta particle
c) Neutron
d) Proton
2. When a point source of light is at a
distance of 50 cm from a photoelectric
cell, the stopping voltage is found to be
Vo. if the same source is placed at a
distance of 1m from the cell, the
stopping potential will be:
a) Vo /-2
b) Vo /4
c) 2Vo
d) Vo
3. A nucleus at rest splits into two nuclear
parts having same density and radii in
the ratio 1:2. Their ratio in velocities
are:
a) 6:1
b) 8:1
c) 2:1
d) 4:1
4. In Rutherford’s alpha scattering
experiment, what will the correct angle
of scattering for impact parameter b=0?
a) 270°
b) 90°
c) 180°
d) 0°
5. The wavelength of the matter waves is
independent of
a) Velocity
b) Mass
c) Charge
d) Momentum
6. The potential energy of the orbital
electron in the ground state of
hydrogen atom is –E. what is its kinetic
energy?
a) E/2
b) E/4
c) 4E
d) 2E
7. Boolean expression for OR gate is
a) Y=A+B
b) Y=𝐴̅
c) Y=A-B
d) Y=𝐴̅ + 𝐵̅
8. When radio wave pass through
ionosphere, phase difference between
space current and capacitive
displacement current is
a) π/2 rad
b) π rad
c) 0 rad
d) 3π/2 rad
9. Which of the following device is full
duplex?
a) Loud speaker
b) Radio
c) Mobile phone
d) Walky talky
10. N type semiconductor is obtained on
doping intrinsic germanium by
a) Aluminium
b) Phosphorous
c) Gold
d) Boron
11. A hole in a semiconductor is
______________ in a covalent bond.
a) A missing electron
b) An excess electron
c) A donor level
d) A missing atom
12. N-P-N transistors are preferred to P-N-P
transistors because they have
a) Low dissipation of energy
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GCET MOCK TEST IN PHYSICS 2016
13.
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b) Low cost
c) Electrons have high mobility than
hole and hence mobility of energy
d) Capable of handing large power
A point charge causes an electric flux of
-1.0 x 103 Nm2 C-1 to pass through a
spherical Gaussian surface of 10 cm
radius central on the charge. If the
radius of the Gaussian surface were
three times, how much flux would pass
through the surface?
a) -3.0 x 103 Nm2 C-1
b) -2.0 x 103 Nm2 C-1
c) 3.0 x 103 Nm2 C-1
d) -1.0 x 103 Nm2 C-1
A stationary charge produces:
a) Only magnetic field
b) Only electric field
c) None
d) Both
To increase the charge on the plates of
a capacitor means
a) To increase the capacitance on the
capacitor
b) To increase the potential difference
between the plates
c) To decrease the potential
difference between the plates
d) To decrease the capacitance of the
capacitor
If the uniform surface charge density on
the infinite plane sheet is σ, electric
field near the surface will be
a) σ/ԑ0
b) 2σ/ԑ0
c) σ/2ԑ0
d) 3σ/ԑ0
Work done in placing a charge of 8 x 1018
C on a capacitor of capacitance 800
µF is:
a) 3.1 x 10-26 J
b) 16 x 10-32 J
c) 4 x 10-32 J
d) 32 x 10-32 J
18. Two identical coils having same number
of turns and carrying equal current have
common centre and their planes are at
right angles to each other. What is the
ratio of magnitude of the resultant
magnetic field due to one of the coils at
the centre?
a) 2:1
b) 1:1
c) √2:1
d) 1:√2
19. Current of 10 A and 2 A are passed
through two parallel wires A & B
respectively in opposite directions. If
the wire A is infinitely long and length
of wire B is 2m, the force acting on the
conductor B which is situated at 10 cm
distance from A will be:
a) 8π x 10-7 N
b) 8 x 10-5 N
c) 4π x 10-7 N
d) 5 x 10-5 N
20. A voltmeter has a resistance of G ohm
and range of V volt. The resistance
required in series to convert it into a
voltmeter it into a voltmeter of range n
V volt is
a) G/n-1
b) G/n
c) nG
d) (n-1)G
21. If velocity of an electron is ( 2𝑖̂ + 3𝑗̂) m/s
and it enters in the magnetic field of
4kT, then
a) Its speed will change
b) Direction of its velocity will change
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GCET MOCK TEST IN PHYSICS 2016
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c) It will move in the opposite
direction to the magnetic field
d) It will move in the direction of the
magnetic field
An electron having 182 eV kinetic
energy is moving on a circular path in a
magnetic of 10-4 T. the speed of the
electron is :
a) 4 x 107 m/s
b) 32 x 1014 m/s
c) 8 x 107 m/s
d) 16 x 107 m/s
̅ , is
A bar magnet of magnet moment 𝑀
placed in a magnetic field of induction
𝐵̅.
̅ .𝐵̅
a) - 𝑀
̅ .𝐵̅
b) 𝑀
̅
c) – 𝐵̅.𝑀
̅ x𝑩
̅
d) 𝑀
To convert a galvanometer into a
ammeter we connect
a) Low resistance in parallel with it
b) Low resistance in series with it
c) High resistance in parallel with it
d) High resistance in series with it
The dimension of RC are same as the
dimensions of which of the following?
a) LR
b) L/R
c) RLC
d) R/L
What is the self inductance of a coil
which produces, self induced emf of 5
V, when the current changes from 3 A
to 2 A in one millisecond?
a) 50 H
b) 5000 H
c) 5 mH
d) 5 H
27. Domain formation is the necessary
feature of
a) Para magnetism
b) Diamagnetism
c) All of them
d) Ferromagnetism
28. A coil of self inductance 0.5 mH carries
a current of 2 A. the energy stored in
jouleis:
a) 0.5
b) 0.05
c) 1.0
d) 0.1
29. A LCR series A.C. circuit is turned to
resonance. The impedance of the circuit
is now:
a) [R2 + (ωL)2 + (1/ωC)2] ½
b) [R2 + (ωL – 1/ωC) 2] ½
c) R
d) [R2 + (1/ωC – ωL)2] ½
30. Resonance frequency of LCR series ac
circuit is f0. Now the capacitance is
made 4 times, then the new resonance
frequency will become:
a) f 0
b) f 0/2
c) f 0/4
d) 2f0
31. If the earth did not have atmosphere,
the temperature would be
a) More
b) Same
c) None
d) Less
32. Write dimensional formulae for the
intensity of radiation
a) M1L2T-2
b) M1L2T-3
c) M1L0T3
d) M1L0T-3
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33. A wavelength of monochromatic light in
vacuum is λ. It travels from vacuum to
medium of absolute refractive index µ.
The ratio of wavelength of the incident
and refracted wave is
a) µ : 1
b) 1 : µ
c) µ2 : 1
d) 1 : 1
34. An object is placed at a distance of 40
cm in front of a concave mirror of focal
length 20 cm. the image produced is
a) Real and erect
b) Virtual and inverted
c) Real, inverted and smaller in size
d) Real, inverted and same in size
35. The phenomenon of polarization of
electromagnetic waves proves that the
electromagnetic waves are
a) Longitudinal
b) Transverse
c) Neither (a) nor (b)
d) Mechanical
36. The limit of resolution of an optical
instrument arises on account of
a) Polarization
b) Interference
c) Reflection
d) Diffraction
37. Two waves coming from two coherent
sources having intensities interfere
their ratio of maximum intensity to
minimum intensity is 25. The intensities
of the sources are in the ratio:
a) 9 : 4
b) 5 : 1
c) 25 : 1
d) 25 : 16
38. The threshold wavelength for a metal
having work function W0 is λ0. What is
the threshold wavelength for a metal
whose work function is W0/2?
a) λ0 / 2
b) λ0 / 4
c) 4λ0
d) 2λ0
39. The photoelectric threshold wavelength
for potassium having work function of 2
eV is
a) 618.7 nm
b) 1860 nm
c) 310.7 nm
d) 1240 nm
40. In Young’s experiment, the distance
between two slits is halved and the
distance between the screen and slit is
made three times. Then width of the
fringe
a) Remains the same
b) Becomes half
c) Becomes 4 times
d) Becomes 6 times
41. The north pole of a magnet is falling on
a metallic ring as shown the figure. The
direction of induced current, if looked
from upside in the ring will be
a) No induced current
b) Clock or anticlockwise depending
on metal of ring
c) Clockwise
d) Anticlockwise
42. The ration of cross sectional areas of
two conducting wires made up of same
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GCET MOCK TEST IN PHYSICS 2016
material and having same length is 1 : 2.
What will be the ratio of heat produced
per second in the wires, when same
current in flowing them?
a) 2 : 1
b) 1 : 4
c) 1 : 1
43.
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45.
46.
d) 1 : √2
An AND gate is followed by a NOT gate
in series. With two inputs A and B, the
Boolean expression for the output Y will
be
a) ̅̅̅̅̅
𝐴. 𝐵
b) ̅̅̅̅̅̅̅̅
𝐴+𝐵
c) A + B
d) A.B
In an A.C circuit, a resistance of R ohm
is connected in series with an inductor
of self inductance L. if the phase angle
between voltage and current be 45°,
the value of inductive reactance (XL) will
be equal to
a) R/8
b) R
c) R/2
d) R/4
Advantages of optical fibre
communications over two wire
transmission line or co axial cable
transmission are
a) High band width, high transmission
loss
b) low band width, low transmission
loss
c) low band width, high transmission
loss
d) High band width, low transmission
loss
There are 2.0 x 1024 molecular dipoles in
a paramagnetic salt. Each has dipole
47.
48.
49.
50.
51.
moment 1.5 x 10-23 Am2. Find maximum
(saturation) magnetization in the
specimen.
a) 50 Am2
b) 200 Am2
c) 30 Am2
d) 20 Am2
At a given place on earth, the angle
between the magnetic meridian and the
geographic meridian is called
__________
a) Magnetic declination
b) Magnetic longitude
c) Magnetic dip
d) Magnetic latitude
The audio frequency lies in the range of
a) 12 Hz to 20 MHz
b) 20kHz to 20 MHz
c) 20 Hz to 20 kHz
d) 20 Hz to 20 MHz
The diameter of the lens of a telescope
is 0.61 m. wavelength of light is 5000 𝐴̇.
The resolution power of the telescope is
a) 2 x 102
b) 2 x 104
c) 106
d) 2 x 106
The internal resistance of a cell of emf 4
V is 0.1 Ω. It is connected to a resistance
of 3.9 Ω. The voltage across the cell will
be
a) 2 V
b) 3.9 V
c) 3.8 V
d) 0.1 V
A ray of light travelling in water is
incident on a glass plate immersed in it.
When the angle of incidence is 51°, the
reflected ray is totally plane polarized,
then find out the refractive index of
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GCET MOCK TEST IN PHYSICS 2016
52.
53.
54.
55.
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glass. (R.I of water=1.3 and tan
51°=1.235)
a) 1.805
b) 1.33
c) 1.305
d) 1.605
Cross sectional area of a copper is equal
to area of square of length 2 mm. if this
copper wire draws 8 A electric current,
then find the drift velocity of free
electron. Number density of electron in
copper wire is 8 x 1028 m-3.
a) 3.12 x 10-2 ms-1
b) 3.12 x 10-3 ms-1
c) 1.56 x 10-2 ms-1
d) 1.56 x 10-4 ms-1
Which of the following undergoes
largest diffraction.
a) Radio wave
b) IR light
c) UV light
d) Gamma rays
A current flows in a conducting wire of
length L. if we bend it in a circular form,
its magnetic dipole moment would be
a) IL/4π
b) IL2/4π
c) I2L2/4π
d) I2L/4π
The tower has height of 75 m. what is
the maximum distance up to which UV
transmission can be received? (radius of
earth=6400 km)
a) 38.98 km
b) 30.98 km
c) 50.98 km
d) 40.98 km
Equivalent capacitance between X & Y
a) 4 µF
b) 2 µF
c) 1 µF
d) 3 µF
57. Complete the nuclear reaction: 4Be9 +
4
12
2He → 6C + ______
a) Neutrino
b) Neutron
c) Electron
d) Proton
58. The number of photons of wavelength
600 nm emitted per second by an
electric bulb of 60 W is
a) 1.5 x 1020
b) 3.0 x 1020
c) 2.0 x 1020
d) 2.0 x 10-20
59. Which of the following graphs
represents motion with uniform speed?
60. When the electric current is switched
off, why do the blades of a fan keep on
moving for some time?
a) Force
b) Torque
c) Air
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GCET MOCK TEST IN PHYSICS 2016
61.
62.
63.
64.
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66.
d) Inertia
When torque acting on a system is zero,
which of the following will be constant?
a) Force
b) Linear momentum
c) Angular momentum
d) Linear impulse
Two satellites are moving in the same
circular orbit around the earth. They
must have the same
a) Mass
b) Kinetic energy
c) Angular momentum
d) Speed
The collector current of a NPN
transistor is 3.9 mA, its emitter current
is 4 mA. What is the common base
current gain of the transistor?
a) 0.975
b) 0.675
c) 0.865
d) 0.873
Unit of dielectric constant of a medium
is
a) C/Nm
b) Nm2/C2
c) C2/(Nm)2
d) None of the above
A transformer works on the principle of
a) Converter
b) Inverter
c) Mutual induction
d) Self induction
An electromagnetic wave goes from air
to glass. Which of the following does
not change?
a) Wavelength
b) Speed
c) Frequency
d) Amplitude
67. In a capacitive circuit
a) Current leads voltage by phase of
π/2
b) Voltage leads current by phase of
π/2
c) Current and voltage are in same
phase
d) Sometimes current lead and
sometimes voltage
68. The self inductance of a straight
conductor is
a) Zero
b) Very large
c) Infinite
d) Very small
69. Which of the following statements are
correct?
I] the direction of the current produced
by electromagnetic induction is given by
Lenz’s law
II] A permanent magnet is used in a
small dynamo
III] The current produced by a A.C.
generator changes in direction only
IV] Generators work on the principle of
electromagnetic induction.
a) I, II & III
b) II & III
c) III & IV
d) II & IV
70. The amplitude of electric and magnetic
fields relate to each other is
a) E0 = B0
b) E0 = cB0
c) E0 = B0/c
d) E0 = c/B0
71. The electric field inside a spherical shell
of uniform surface charge density is
a) Zero
b) Less than zero
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GCET MOCK TEST IN PHYSICS 2016
c) Directly proportional to distance
from the centre
d) None of these
72. Ratio of intensities of two waves is
given by 9 : 1. Then the ratio of their
amplitude is
a) 1 : 9
b) 9 : 1
c) 2 : 1
d) 3 : 1
73. What will be the angular momentum in
the fourth orbit, if L is the angular
momentum of the electron in the
second orbit of hydrogen atom?
a)
3
2
d)
2
3
L
74. A cylindrical lens is required to correct
a) Astigmatism
b) Presbyopia
c) Myopia
d) Hypermetropia
75. What changes on polatization of light?
a) Wavelength
b) Phase
c) Frequency
d) Intensity
L
b) 2𝐿
c) L/2
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