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

A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

Question # 2

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

Question # 3

The powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be

Question # 4

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

Question # 5

Capacitance of two or more capacitors

Question # 6

The SI unit of current is

Question # 7

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

Question # 8

At any point on the right bisector of the line joining two equal and opposite charges

Question # 9

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

Question # 10

The resistance of a conductor does not depend on its

Question # 11

The SI unit of permitivity is

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

If electric and gravitational force on an electron in a uniform electric field will be

Question # 17

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

Question # 18

The charge carriers in gases are

Question # 19

The unit of intensity of electric field is

Question # 20

An electric charge at rest is

Question # 21

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 # 22

If a 40 watt light bulb burns for 2 hours. how much heat is generated

Question # 23

Heating effect caused by an electric circuit is written

Question # 24

In a charged capacitor the energy is stored in

Question # 25

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

Question # 26

Which of the following represents an electric current?

Question # 27

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

Question # 28

The SI unit of capacitance is

Question # 29

A car battery has e.m.f 12 volt and internal resistance 5 x 10-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

Question # 30

The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is
A. 11.0 ohm
B. 1.0 ohm
C. 7.0 ohm
D. 3.0 ohm
2 In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes
A. Four-fold
B. One-half
C. One-fourth
D. Zero
3 The unit of intensity of electric field is
A. newton/coluomb
B. jule/coluomb
C. volt x metre
D. newton/metre
4 The unit of conductance is
A. ohm
B. meter
C. mho
D. ohm-meter
5 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
A. 0.4 A
B. 11.4 A
C. 9.8 A
D. 10.6 A
6 A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J
A. 5
B. 0.5
C. 0.005
D. 50
7 A 60 W bulb operates on 220 V supply. The current flowing through the bulb is
A. 11/3 A
B. 3 A
C. 3/11 A
D. 6
8 Resistor is a device which convert electric energy to
A. Heat energy
B. Chemical energy
C. Elastic energy
D. All of the above
9 Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be
A. 711μF
B. 611μF
C. 811μF
D. 511μF
10 A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to
A. -q
B. +q
C. -2q
D. +4q

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