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

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

Question # 2

Specific resistance of a wire depends upon

Question # 3

Electric potential of earth is taken to be zero because the earth is good

Question # 4

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

Question # 5

The minimum charge on any object can not be less than

Question # 6

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

Question # 7

The unit of resistivity is

Question # 8

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

Question # 9

The fractional change in resistance per kelvin is known as

Question # 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

Question # 11

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

Question # 12

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

Question # 13

The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of

Question # 14

The relation V = IR represents

Question # 15

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

Question # 16

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 # 17

The electric flux from a closed surface

Question # 18

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 # 19

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

Question # 20

Thermocouple is an arrangement of two different metals

Question # 21

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 # 22

Which of the following represents an electric current?

Question # 23

The unit of intensity of electric field is

Question # 24

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

Question # 25

In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called

Question # 26

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 # 27

Ohm is the unit of

Question # 28

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

Question # 29

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

Question # 30

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

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ECAT Class Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Resistor is a device which convert electric energy to
A. Heat energy
B. Chemical energy
C. Elastic energy
D. All of the above
2 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
3 Which of the following represents an electric current?
A. C-1
B. CS-1
C. J.S-1
D. dynes-1
4 Some charge is being given to a conductor. Then its potential
A. Is maximum at surface
B. Is maximum at centre
C. Is remain same throughout the conductor
D. Is maximum somewhere between surface and centre
5 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
A. Zero
B. 10Ω
C. 1Ω
D. 0.10Ω
6 A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts
A. 1310 W
B. 670 W
C. 810 W
D. 1210 W
7 If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be
A. 6 ohm
B. 4 ohm
C. zero ohm
D. 1.33 ohm
8 Solar cell converts sunlight directly into
A. potential energy
B. thermal energy
C. mechanical energy
D. electrical energy
9 A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then
A. The charge in the plates reduces and potential difference increase
B. Potential difference between the plates increase, stored energy decreases and charge remains the same
C. Potential difference between the plates decreases and charge remains unchanged
D. None of the above
10 A conducting wire is drawn to double its length. Final resistivity of the material will be
A. Double of the original one
B. Half of the original one
C. One fourth of the original one
D. Same as original one

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