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 unit of conductance is

Question # 2

Electric generators which convert mechanical energy into

Question # 3

A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be

Question # 4

The earth's potential is taken as

Question # 5

If the length of the conductor is double and its cross sectional area is halved, its conductance will

Question # 6

The value of electrical constant of proportionality k is

Question # 7

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

Question # 8

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

Question # 9

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

Question # 10

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 # 11

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

Question # 12

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

Question # 13

In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be

Question # 14

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

Question # 15

The resistance of a conductor does not depend on its

Question # 16

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

Question # 17

Coulomb's force between two point charges depends upon

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

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

Question # 20

Which of the following does not obey ohm's law?

Question # 21

One coulomb per second is equal to

Question # 22

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

Question # 23

The charge carriers in electrolyte are positive and negative

Question # 24

Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends

Question # 25

The nature of capacity of electrostatic capacitor depends on

Question # 26

Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then

Question # 27

The relation V = IR represents

Question # 28

An electric charge at rest is

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called
A. Time constant
B. Decay constant
C. None of these
D. All of above
2 Battery is charged in motor cars, which is based on
A. Chemical effect
B. Magnetic effect
C. Electric effect
D. None
3 Surface density of charge is defined as
A. Charge per unit volume
B. Charge per unit length
C. Charge per unit area
D. Charge per unit mass
4 The fractional change in resistance per kelvin is known as
A. temperature coefficient
B. resistance coefficient
C. super temperature
D. critical temperature
5 Ohm is the unit of
A. current
B. capacitance
C. energy
D. resistance
6 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
7 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
A. -10 N
B. +10 N
C. +20 N
D. -20 N
8 The SI unit of conductivity is
A. ohm-m
B. ohm-1m-1
C. ohm-m-1
D. ohm-1m
9 The SI unit of capacitance is
A. Farad
B. Henry
C. Ohm
D. Volt
10 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?
A. Zero
B. 5μC m-2
C. 20μC m-2
D. 8μC m-2

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