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

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

Question # 2

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

Question # 3

The unit of intensity of electric field is

Question # 4

A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?

Question # 5

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

Question # 6

A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy

Question # 7

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

Question # 8

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

Question # 9

The potential difference across each resistance in series combination is

Question # 10

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

Question # 11

What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts?

Question # 12

The relation V = IR represents

Question # 13

Ohm is the unit of

Question # 14

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 # 15

Potentiometer is more sensitive than voltmeter, because

Question # 16

A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts

Question # 17

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

Question # 18

The resistance of a conductor does not depend on its

Question # 19

An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be

Question # 20

The conductivity of a superconductor is

Question # 21

The resistance of the given conductor can be increased by

Question # 22

The resistivity of a substance depends upon the

Question # 23

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

Question # 24

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

Question # 25

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

Question # 26

Free electrons are

Question # 27

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10-3N. The force between A and B when the charges on them are doubled and distance is halved

Question # 28

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

Question # 29

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

Question # 30

The resistance of an incandescent lamp is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 106electrons are moving through a wire per second, the current developed is
A. 1.6 x 10-19
B. 1 A
C. 1.6 x 10-15 A
D. 106A
2 Electric potential of earth is taken to be zero because the earth is good
A. Semiconductor
B. Conductor
C. Insulator
D. Dielectric
3 Free electrons are
A. tightly bound
B. fixed
C. loosely bound
D. tightly fixed
4 The charge per unit time through any cross-section of a conductor is called
A. capacitance
B. electric power
C. current
D. potential difference
5 Battery is charged in motor cars, which is based on
A. Chemical effect
B. Magnetic effect
C. Electric effect
D. None
6 If we increase the distance between two plates of the capacitor, the capacitance will
A. Increase
B. Decrease
C. Remain same
D. First increase then decrease
7 The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is
A. Q=V/C
B. Q=C/V
C. Q=1/2CV
D. Q=CV
8 For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is
A. 3/5 ohm
B. 2 ohm
C. 6/5 ohm
D. 3 ohm
9 In bringing an electron towards another electron, electrostatic potential energy of system
A. Decreases
B. Increases
C. Remains uncharged
D. Becomes zero
10 The liquid which conduct current is known as
A. heating effect
B. chemical energy
C. electrolyte
D. ohm's law

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