ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 12 Electrostatics

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ECAT Pre General Science Physics Chapter 12 Electrostatics

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Question # 1

Free electrons are

Question # 2

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

Question # 3

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

Question # 4

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 # 5

The charge per unit time through any cross-section of a conductor is called

Question # 6

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

Question # 7

The resistivity of a substance depends upon the

Question # 8

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

Question # 9

Equal charges are given to two spheres of different radii. The potential will

Question # 10

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10-19N, is

Question # 11

106electrons are moving through a wire per second, the current developed is

Question # 12

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

Question # 13

If electric and gravitational force on an electron in a uniform electric field will be

Question # 14

One joule is equal to

Question # 15

Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if

Question # 16

The unit of conductance is

Question # 17

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

Question # 18

The electric intensity outside the two oppositely charged parallel metal plates is

Question # 19

A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is

Question # 20

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 # 21

The relation between charge 'Q' and current 'I' is given by

Question # 22

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

Question # 23

In a charged capacitor the energy is stored in

Question # 24

One coulomb per second is equal to

Question # 25

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

Question # 26

A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is

Question # 27

If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be

Question # 28

The SI unit of conductivity is

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 charge carriers in gases are

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Ohm established a relation between
A. voltage and resistance
B. voltage and charge
C. voltage and current
D. voltage resistance and charge
2 The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is
A. 10 KJ
B. 5 KJ
C. 2 KJ
D. 1 KJ
3 In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called
A. Time constant
B. Decay constant
C. None of these
D. All of above
4 The electric flux from a closed surface
A. Is independent of the shape of the surface
B. Depends on the charge enclosed by the surface
C. Both a and b
D. None of the above
5 The charge per unit time through any cross-section of a conductor is called
A. capacitance
B. electric power
C. current
D. potential difference
6 The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is
A. 10Ω
B. 20Ω
C. 30Ω
D. 40Ω
7 Thermocouple is an arrangement of two different metals
A. To convert heat energy in to electrical energy
B. To produce more heat
C. To convert heat energy into chemical energy
D. To convert electric energy in to heat energy
8 If the distance of separation between two chares is increased, the electrical potential energy of the system will
A. Increase
B. Decrease
C. May increase or decrease
D. Remain the same
9 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
10 The ohm's is defined as
A. 1 ampere / 1 volts
B. 1 coulomb / 1 volt
C. 1 volt / 1 ampere
D. 1 volt / 1 coulomb

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