ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

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

Try The 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

Ohm is the unit of

Question # 2

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

Question # 3

The SI unit of current is

Question # 4

Physicist George Simon ohm was a

Question # 5

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

Question # 6

The energy stored in a charge capacitor

Question # 7

The minimum charge on any object can not be less than

Question # 8

The unit of resistance is

Question # 9

Ohm's law states that

Question # 10

An electric dipole is at the centre of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)

Question # 11

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

Question # 12

Which one of the following causes production of heat when current is set up in a wire?

Question # 13

A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

Question # 14

The nature of capacity of electrostatic capacitor depends on

Question # 15

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 # 16

The charge carriers in gases are

Question # 17

The electric intensity at infinite distance from the point charge will be

Question # 18

Consider a spherical shell of metal at he centre of which a positive point charge is kept

Question # 19

Electron volt is the unit of

Question # 20

A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

Question # 21

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 # 22

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 # 23

The SI unit of conductivity is

Question # 24

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

Question # 25

The speed of randomly moving electrons depends upon

Question # 26

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 # 27

A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?

Question # 28

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

Question # 29

Current provided by a battery is maximum when

Question # 30

A condenser of capacity 50μF is charged to 10 V.The energy stored is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to
A. Coulomb's law
B. Gauss's law
C. Biot-Sarwat law
D. Ampere's law
2 Heating effect caused by an electric circuit is written
A. H = I2Rt
B. H = I2R
C. H = IR2t
D. H = IR2
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 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
5 Resistance of a conductor depends upon
A. the quantity of current passing through it
B. the voltage applied between its end
C. its dimensions, physical state and nature of its material
D. all of the above
6 The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is
A. 9 x 105V
B. 9 V
C. 8 x 106V
D. 80 V
7 A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?
A. 108 g
B. 10.8 g
C. 0.8 g
D. 108/0.8 g
8 One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is
A. 0.1 V
B. 8 V
C. 2 V
D. 0.5 V
9 A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?
A. 200 W
B. 302.5
C. 250 W
D. 350 W
10 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

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