ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 12 Electrostatics

Try The 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 ohm's is defined as

Question # 2

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

Question # 3

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

Question # 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

Question # 5

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

Question # 6

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

Question # 7

Ohm is the unit of

Question # 8

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 # 9

Electron volt is the unit of

Question # 10

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

Question # 11

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 # 12

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

Question # 13

Surface density of charge is defined as

Question # 14

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 # 15

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

Question # 16

The speed of randomly moving electrons depends upon

Question # 17

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

Question # 18

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

Question # 19

Battery is charged in motor cars, which is based on

Question # 20

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 # 21

The nature of capacity of electrostatic capacitor depends on

Question # 22

The SI unit of current is

Question # 23

In bringing an electron towards another electron, electrostatic potential energy of system

Question # 24

Ohm's law states that

Question # 25

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

Question # 26

Potentiometer is more sensitive than voltmeter, because

Question # 27

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

Question # 28

Specific resistance of a wire depends upon

Question # 29

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

Question # 30

Electron volt is the unit of.

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The relation between charge 'Q' and current 'I' is given by
A. Q = I/t
B. Q = It
C. Q = I2t
D. Q = I2/t
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 The charge per unit time through any cross-section of a conductor is called
A. capacitance
B. electric power
C. current
D. potential difference
4 One coulomb per second is equal to
A. One volt
B. One ampere
C. One hom
D. One henry
5 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
6 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
7 If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be
A. 1/3 V
B. 2/3 V
C. 3/2 V
D. 3V
8 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
9 Free electrons are
A. tightly bound
B. fixed
C. loosely bound
D. tightly fixed
10 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

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