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 value of electrical constant of proportionality k is

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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 # 7

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

Question # 8

The speed of randomly moving electrons depends upon

Question # 9

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 # 10

One joule is equal to

Question # 11

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

Question # 12

The thermistors are usually made of

Question # 13

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 # 14

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 # 15

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

Question # 16

If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be

Question # 17

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 # 18

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 # 19

The concept of field theory was put forward by

Question # 20

The SI unit of permitivity is

Question # 21

Battery is charged in motor cars, which is based on

Question # 22

Electric flux is defined by the relation

Question # 23

The liquid which conduct current is known as

Question # 24

What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts?

Question # 25

The electric flux is linked with a surface will be maximum when

Question # 26

If the two charges in Coulomb's law have double distance between them, then electric force

Question # 27

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

Question # 28

Surface density of charge is defined as

Question # 29

Resistance of a conductor depends upon

Question # 30

One electron volt is equal to

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 One electron volt is equal to
A. 1.6 x 1019eV
B. 6.25 x 1018 eV
C. 1.6 x 1018 eV
D. 6.25 x 1019eV
2 The unit of resistance is
A. volt
B. ampere
C. ohm
D. coat
3 Battery is charged in motor cars, which is based on
A. Chemical effect
B. Magnetic effect
C. Electric effect
D. None
4 A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor
A. Increases
B. Decreases
C. Remain unchanged
D. Becomes infinite
5 The SI unit of current is
A. watt
B. coulomb
C. volt
D. ampere
6 A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance
A. Increase k time
B. Decreases k times
C. Decreases 1/K times
D. Remains unchanged
7 Ohm is the unit of
A. current
B. capacitance
C. energy
D. resistance
8 The earth's potential is taken as
A. Negative
B. Positive
C. Zero
D. Infinite
9 A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be
A. 64 W
B. 80 W
C. 100 W
D. 125 W
10 A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy
A. 200 J
B. 100 J
C. 1000 J
D. 400 J

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