ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Question # 1

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 # 2

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 # 3

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

Question # 4

Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be

Question # 5

The SI unit of electric flux is

Question # 6

Which of the following represents an electric current?

Question # 7

The earth's potential is taken as

Question # 8

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is

Question # 9

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 # 10

Resistance of a conductor depends upon

Question # 11

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

Question # 12

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 # 13

Thermocouple is an arrangement of two different metals

Question # 14

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

Question # 15

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

Question # 16

One coulomb per second is equal to

Question # 17

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

Question # 18

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

Question # 19

The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is

Question # 20

One coulomb of charge is created by

Question # 21

The resistance of a conductor does not depend on its

Question # 22

The ohm's is defined as

Question # 23

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

Question # 24

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

The concept of field theory was put forward by

Question # 29

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 # 30

Capacitance of two or more capacitors

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The value of electrical constant of proportionality k is
A. 9 x 109Nm2C-2
B. 9 x 10-9Nm2C-2
C. 9 x 1010Nm2C2
D. 9.85 x 10-12N-1C-2
2 The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become
A. 7.20 N
B. 11.25 N
C. 22.50 N
D. 45.00
3 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
4 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
5 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
6 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
A. 10μF
B. 20μF
C. 30μF
D. 15μF
7 Free electrons are
A. tightly bound
B. fixed
C. loosely bound
D. tightly fixed
8 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
9 The SI unit of conductivity is
A. ohm-m
B. ohm-1m-1
C. ohm-m-1
D. ohm-1m
10 In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be
A. 0.4 A
B. 11.4 A
C. 9.8 A
D. 10.6 A

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