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

If a 40 watt light bulb burns for 2 hours. how much heat is generated

Question # 2

The ohm's is defined as

Question # 3

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

Question # 4

The relation V = IR represents

Question # 5

The liquid which conduct current is known as

Question # 6

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

Question # 7

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

Question # 8

The potential difference across each resistance in series combination is

Question # 9

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

Question # 10

The dot product of electric field intensity E and vector area A is called

Question # 11

If the two charges in Coulomb's law have double distance between them, then electric force

Question # 12

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

Question # 13

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

Question # 14

The value of electrical constant of proportionality k is

Question # 15

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

Question # 16

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

Question # 17

At ordinary temperature, an increase in temperature increases the conductivity of

Question # 18

The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as

Question # 19

Which of the following does not obey ohm's law?

Question # 20

The conductivity of a superconductor is

Question # 21

If we increase the distance between two plates of the capacitor, the capacitance will

Question # 22

One coulomb of charge is created by

Question # 23

A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?

Question # 24

The minimum charge on any object can not be less than

Question # 25

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

Question # 26

One coulomb per second is equal to

Question # 27

Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become

Question # 28

The energy stored in a charge capacitor

Question # 29

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

Question # 30

The electric flux is linked with a surface will be maximum when

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The earth's potential is taken as
A. Negative
B. Positive
C. Zero
D. Infinite
2 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
3 The thermistors are usually made of
A. Metals with low temperature coefficient of resistivity
B. Metals with high temperature coefficient of resistivity
C. Metal oxides with high temperature coefficient of resistivity
D. Semi conducting materials having low temperature coefficient of resistivity
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 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
7 A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be
A. 2 R
B. R
C. R/2
D. R/4
8 A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?
A. Zero
B. 5μC m-2
C. 20μC m-2
D. 8μC m-2
9 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
10 A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 KV, its kinetic energy will be
A. 1840 KeV
B. 1/1840 KeV
C. 1 KeV
D. 920 KeV

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