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 graphical representation of ohm's law 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

Surface density of charge is defined as

Question # 4

Which of the following represents an electric current?

Question # 5

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

Question # 6

One electron volt is equal to

Question # 7

The value of electrical constant of proportionality k is

Question # 8

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

Question # 9

Physicist George Simon ohm was a

Question # 10

The earth's potential is taken as

Question # 11

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

Question # 12

A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

Question # 13

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

Question # 14

The concept of field theory was put forward by

Question # 15

The dot product of electric field intensity E and vector area A is called

Question # 16

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

Question # 17

Current provided by a battery is maximum when

Question # 18

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

Question # 19

The electric lines of force are

Question # 20

If we increase the distance between two plates of the capacitor, the capacitance will

Question # 21

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

Question # 22

A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 KV, its kinetic energy will be

Question # 23

Which one of the following causes production of heat when current is set up in a wire?

Question # 24

The potential difference across each resistance in series combination is

Question # 25

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

Question # 26

Solar cell converts sunlight directly into

Question # 27

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

Question # 28

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

Question # 29

The SI unit of electric field intensity is

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
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
A. 25
B. 225
C. 625
D. 1250
2 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
3 A closed surface contains two equal and opposite charges. The net electric flux from the surface will be
A. Negative
B. Positive
C. Infinite
D. Zero
4 Resistor is a device which convert electric energy to
A. Heat energy
B. Chemical energy
C. Elastic energy
D. All of the above
5 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
A. Two
B. 1/2
C. Zero
D. 3/2
6 One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is
A. 0.1 V
B. 8 V
C. 2 V
D. 0.5 V
7 If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be
A. 6 ohm
B. 4 ohm
C. zero ohm
D. 1.33 ohm
8 If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is
A. one ohm
B. one joule
C. one volt
D. one ampere
9 The potential difference across each resistance in series combination is
A. same
B. different
C. zero
D. none of these
10 If the length of the conductor is double and its cross sectional area is halved, its conductance will
A. Increase four fold
B. Become one-fourth
C. Become one-half
D. Remains unchanged

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