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, 27  2016
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51. A hollow sphere of copper is positively charged.
then the electric field inside the sphere is?
a) the same as the field at the surface
b) greater than the field at the surface
c) less than the field at the surface d) zero
52. The potential inside a hollow spherical
conductor?
a) is constant
b) varies directly as the distance from the centre
c) varies inversely as the distance from the centre
d) none of these
53. The electric field intensity on the surface of a
charged conductor is?
a) zero
b) directed normally to the surface
c) directed tangentially to the surface
d) directed along 450 to the surface
54. No current flows between two charged bodies
when connected?
a) if they have same capacity
b) it they have same quantity of charge
c) if they have same potential
d) none of these
An electron volt is equal to?
PHYSICAL SCIENCE
1. A current carrying conductor is associated with?
a) a magnetic field
b) an electric field
c) an electro - magnetic field
d) an electronic field
2. Farad is the unit of ?
a) resistance
b) conductance
c) capacitance
d) inductance
3. Ohm's law valid incase of ?
a) super conductor
b) insulater
c) semi conductor
d) conductor
4. A good conductor while carrying current is?
a) negatively charges b) positively charges
c) electrically charges
d) alternatively charged positive, negative
5. Indicate the false statement about the
resistance of a wire ?
a) it depends on material of wire
b) it is directly proportional to the length
of the wire
c) it is directly proportional to the area of
cross- section of wire
d) resistance of metallic wire increases
with increase temperature
6. For which of the following substances,
the resistance decreases with increase in
temperature?
a) pure silicon
b) copper
c) nichrome
d) platinum
7. Full from of CFL used place of electric bulbs is ?
a) compact fluorescent lamp
b) constantan filament lamp
c) closed filament lamp
d) closed fluorescent lamp
8. Electronic precipitator is used to control?
a) air pollution
b) water pollution
c) solid waste
d) noise pollution
9. The best conductor of electricity among
the following is?
a) copper b) iron c) aluminium d) silver
10. Safety fuse wire used in domestic electrical appliances is made metal of low ?
a) resistance
b) melting point
c) specific gravity
d) conductance
11. Which of the following is a conductor of
electricity?
a) rubber
b) pure water
c) salt water
d) benzene
12. If input frequency of a full wave rectifier
be n, then output frequency would be?
a) n/r
b) n
c) 3n/r
d) 2n
13. A transformer works on the principle of?
a) self induction
b) mutual induction
c) generator
d) inverter
14. Moving electric charge produces?
a) magnetic
b) sound waves
c) light rays
d) heat waves
15. In AC circuits, AC meters measure?
a) mean values
b) rms values
c) peak values
d) mean square values
16. The best material for the core of a
transformer is?
a) stainless steel
b) mild steel
c) hard steel
d) soft iron
17. The metal whose electrical conductivity
is more, is?
a) copper
b) aluminium
c) silver
d) lead
M. Saidulu
Physical Science
Faculty
Hyderabad
For All
Competitive
Exams
40.
41.
18. Water cannot be used to extinguish fire
caused by electric current, because?
a) it may cause electrocution
b) is may cause hydrolysis
c) is may cause electrolysis
d) is may spoil the wiring
19. Alternating current is converted into
direct current by a ?
a) transformer
b) dynamo
c) oscillator
d) rectifier
20. Super conductors are those elements?
a) whose conductivity is intermediate
between metals and insulators
b) whose resistance falls almost to zero at
very low temperature
c) which turn into insulators at very low
temperatures
d) which conduct electricity only at supper
high temperatures
21. Magnetism in materials is due to?
a) electrons at rest
b) circular motion of electrons
c) protons at rest
d) all neutrons at rest
22. The metal used to make lighting conductors is?
a) iron b) aluminium c) copper d) zinc
23. The earth wire of a cable is connected to?
a) the outer metallic body of the appliance
b) the fuse of the appliance
c) the filament of the appliance
d) short circuitery of the appliance
24. Tungsten is used for the manufacture of
the filament of an electric bulb, because?
a) it is a good conductor
b) it is econamical
c) it is malleable
d) it has a very high melting point
25. Dynamo is a device for converting?
a) heat energy into electrical energy
b) mechanical energy into electrical energy
c) magnetic energy into electrical energy
d) chemical energy into electrical energy
26. Which of the following metals is used for
the manufacture of heating elements
provided in electric iron?
a) nickel
b) chromium
c) nichrome
d) tungsten
27. When the main switch of the house is put
off it disconnects the?
a) live wire only
b)live wire and the earth wire
c) live wire and the neutral wire
d) the earth wire and the neutral wire
28. Good conductor of electricity is?
a) dry air
b) paper
c) kerosene
d) graphite
29. Tap recorder should not be kept near
one of the following things?
a) clock
b) magnet
c) electric switch board d) radio
30. Which of the following is a good condu-ctor
of heat but a bad conductor of electricity?
a) celluloid
b) rubber
c) asbestos
d) mica
31. Lightening is caused due to?
a) electric power
b) electric discharge
c) electric leak
d) electric pressure
32. A bird sitting on a high tension electric
wire does not get electrocuted, because?
a) it has a high resistance
b) the body is earthed
c) it does not form a closed path for the flow
of current
d) its feet are good insulators
33. Which of the following is arranged in
order of decreasing conductivity?
a) copper, aluminium, steel, silver
b) aluminium, silver, copper, steel
c) copper, silver, aluminium, steel
d) silver, copper, aluminium, steel
34. If a copper wire is increased to double its
length, its resistance will become?
a) four times
b) one fourth
c) double
d) half
35. Super conductor is the conductor whose
...... is zero ?
a) potential
b) current
c) resistance
d) inductance
36. Electricity is transmitted over long
distances?
a) it is fast b) there is less wastage of energy
c) it is safer
d) it is cheaper
37. The nature of the fuse wire is?
a) high resistance and low melting point
b) high resistance and high melting point
c) low resistance and high melting point
d) low resistance and low melting point
38. Electric current in a metal is due to the
flow of?
a) electrons b) protons c) ions d) holes
39. According to coulomb's law, the electrostatic force between two charges is?
a) inversely proportional to the product of
42.
43.
44.
45.
46.
47.
48.
49.
50.
the charges
b) inversely proportional to the square of
the distance between the charges
c) directly proportional to the square of the
distance between the charges
d) none of these
1 volt equals?
a) 1J
b) 1J/c
c) 1c/J
d) none
In coulomb's law, the constant of
proportional k = 1/4πEo has units?
a) N b) N-m2 c) Nm2/c2 d) Nc2/m2
A positively charged body has?
a) excess of electron
b) deficiency of electron
c) no change in number of electron
d) none of these
When a glass rod is rubbed with silk,
both glass rod and silk?
a) acquire equal and similar charges
b) acquire equal and opposite charges
c) acquire unequal and opposite charges
d) acquire unequal and similar charges
A suitable unit for expressing electric
field strength is?
a) v/c
b) A-m
c) c/m2
d) N/c
How many electrons will have a charge
of one coulomb?
a) 6.2x1018
b) 6.2x1019
18
c) 5.2x10
d) 5.2x1019
Two charges of 1 coulomb, 5 coulomb
are placed at some distance in air. the
ratio of the forces acting on the is?
a) 1:25
b) 1:5
c) 1:1
d) 5:1
An electron volt is equal to?
a) 0.62x1013J
b) 1.6x10-13J
c) 0.62x1019J
d) 1.6x10-19J
Two charges are placed at a distance a
part. if a glass slab is placed between
them, force between them will?
a) increase
b) decrease
c) remain same
d) be zero
The work done in moving charge on an
equipotential surface is?
a) finite and positive
b) infinite
c) finite and negative
d) zero
A soap bubble is given negative charge,
then its radius?
a) decreases
b) increases
c) remains unchanged
d) none of these
Answers
1-a,
7-a,
13-b,
19-d,
25-b,
31-b,
37-a,
43-b,
49-d,
2-c,
8-a,
14-a,
20-b,
26-c,
32-c,
38-a,
44-d,
50-b,
3-d,
9-d,
15-b,
21-b,
27-c,
33-d,
39-b,
45-a,
51-d,
4-c,
10-b,
16-d,
22-c,
28-d,
34-c,
40-b,
46-c,
52-a,
5-c,
11-c,
17-c,
23-b,
29-b,
35-c,
41-c,
47-d,
53-b,
6-a,
12-d,
18-a,
24-d,
30-d,
36-b,
42-b,
48-b,
54-c