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

Question # 2

A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?

Question # 3

The unit of resistance is

Question # 4

At ordinary temperature, an increase in temperature increases the conductivity of

Question # 5

An alpha particle is accelerated through a potential difference of 106volt. Its kinetic energy will be

Question # 6

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

Question # 7

The charge carriers in gases are

Question # 8

A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy

Question # 9

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

Which of the following represents an electric current?

Question # 14

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

Question # 15

Ohm's law states that

Question # 16

Specific resistance of a wire depends upon

Question # 17

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

Question # 18

The capacity of a parallel plat capacitor depends on the

Question # 19

The minimum charge on any object can not be less than

Question # 20

The unit of intensity of electric field is

Question # 21

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 # 22

Potentiometer is more sensitive than voltmeter, because

Question # 23

For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is

Question # 24

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

Question # 25

A conducting wire is drawn to double its length. Final resistivity of the material will be

Question # 26

If the distance of separation between two chares is increased, the electrical potential energy of the system will

Question # 27

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 # 28

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 # 29

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

Question # 30

An electric dipole is at the centre of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Physicist George Simon ohm was a
A. German physical
B. French physicist
C. Chinese physicist
D. Russian physicist
2 Free electrons are
A. tightly bound
B. fixed
C. loosely bound
D. tightly fixed
3 The nature of capacity of electrostatic capacitor depends on
A. Shape
B. Size
C. Thickness of plates
D. Area
4 The thermistors are usually made of
A. Metals with low temperature coefficient of resistivity
B. Metals with high temperature coefficient of resistivity
C. Metal oxides with high temperature coefficient of resistivity
D. Semi conducting materials having low temperature coefficient of resistivity
5 In bringing an electron towards another electron, electrostatic potential energy of system
A. Decreases
B. Increases
C. Remains uncharged
D. Becomes zero
6 The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is
A. 4/5Ω
B. 5/4Ω
C. 20Ω
D. 0.05 Ω
7 One coulomb per second is equal to
A. One volt
B. One ampere
C. One hom
D. One henry
8 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
9 For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is
A. 3/5 ohm
B. 2 ohm
C. 6/5 ohm
D. 3 ohm
10 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

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