ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Question # 1

In a voltmeter the conduction takes place due to

Question # 2

In a charged capacitor the energy is stored in

Question # 3

Some charge is being given to a conductor. Then its potential

Question # 4

A car battery has e.m.f 12 volt and internal resistance 5 x 10-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

Question # 5

The concept of field theory was put forward by

Question # 6

The relation V = IR represents

Question # 7

The unit of intensity of electric field is

Question # 8

Electric flux is defined by the relation

Question # 9

The nature of capacity of electrostatic capacitor depends on

Question # 10

Magnetic effect at a point caused due to flow a current depend upon the

Question # 11

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

Question # 12

One electron volt is equal to

Question # 13

If the length of the conductor is double and its cross sectional area is halved, its conductance will

Question # 14

The unit of conductance is

Question # 15

The electric lines of force are

Question # 16

The SI unit of current is

Question # 17

A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be

Question # 18

Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends

Question # 19

Electron volt is the unit of

Question # 20

The resistivity of a substance depends upon the

Question # 21

Which one of the following has larger value of relative permitivity Erat room temperature?

Question # 22

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

Question # 23

The speed of randomly moving electrons depends upon

Question # 24

In bringing an electron towards another electron, electrostatic potential energy of system

Question # 25

The SI unit of electric flux is

Question # 26

In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19C. The number of excess electrons on the drop is

Question # 27

Ohm's law states that

Question # 28

If the distance of separation between two chares is increased, the electrical potential energy of the system will

Question # 29

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

Question # 30

The resistance of an incandescent lamp is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be
A. 1/3 V
B. 2/3 V
C. 3/2 V
D. 3V
2 The resistivity of a substance depends upon the
A. length
B. mass
C. area
D. temperature
3 The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will
A. Increase
B. Decrease
C. Remain F
D. Become 10F/9
4 Solar cell converts sunlight directly into
A. potential energy
B. thermal energy
C. mechanical energy
D. electrical energy
5 The powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be
A. 1 : 2
B. 2 : 1
C. 1 : 4
D. 4 : 1
6 A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is
A. Charge Q
B. Potential V
C. Capacity
D. Energy U
7 Consider a spherical shell of metal at he centre of which a positive point charge is kept
A. The electric filed is zero outside the shell
B. The electric field is zero everywhere
C. The electric field is zero in the region inside the shell
D. The electric field is non-zero in both regions outside and inside the shell
8 The substances whose resistance decreases with the increase in temperature these substances have coefficient of
A. positive temperature
B. negative temperature
C. absolute temperature
D. zero temperature
9 Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends
A. 120 C
B. 240 C
C. 20 C
D. 4 C
10 Potentiometer is more sensitive than voltmeter, because
A. Voltmeter has a very high resistance
B. Voltmeter has a very low resistance
C. Potentiometer does not draw any current from a source of unknown potential difference
D. Potentiometer is sensitive

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