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

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

Question # 2

The fractional change in resistance per kelvin is known as

Question # 3

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

The thermistors are usually made of

Question # 8

The unit of resistance is

Question # 9

Resistance of a conductor depends upon

Question # 10

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

Question # 11

The resistance of a conductor does not depend on its

Question # 12

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

Question # 13

Free electrons are

Question # 14

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 # 15

The current through a metallic conductor is due to the motion of

Question # 16

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

Question # 17

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 # 18

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 # 19

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 # 20

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

Question # 21

The electric field due to an infinite long thin wire at a distance R varies as

Question # 22

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

Question # 23

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 # 24

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

Question # 25

Solar cell converts sunlight directly into

Question # 26

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

Question # 27

Heating effect caused by an electric circuit is written

Question # 28

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

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 Magnetic effect at a point caused due to flow a current depend upon the
A. Quantity of current
B. Distance from current
C. Both the quantity of current and distance from current element
D. None of the all
3 A closed surface contains two equal and opposite charges. The net electric flux from the surface will be
A. Negative
B. Positive
C. Infinite
D. Zero
4 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
A. Two
B. 1/2
C. Zero
D. 3/2
5 A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J
A. 5
B. 0.5
C. 0.005
D. 50
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 A car battery has e.m.f 12 volt and internal resistance 5 x 10-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be
A. 5 volt
B. 3 volt
C. 15 volt
D. 9 volt
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 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
10 Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be
A. 711μF
B. 611μF
C. 811μF
D. 511μF

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