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

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

Question # 2

Potentiometer is more sensitive than voltmeter, because

Question # 3

Which one of the following has larger value of relative permitivity Erat room temperature?

Question # 4

The unit of conductance is

Question # 5

An electric charge at rest is

Question # 6

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

Question # 7

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

Question # 8

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

Question # 9

Resistance of a conductor is increased, the currant will

Question # 10

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

Question # 11

One electron volt is equal to

Question # 12

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

Question # 13

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 # 14

Free electrons are

Question # 15

Heating effect caused by an electric circuit is written

Question # 16

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 # 17

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

Question # 18

The nature of capacity of electrostatic capacitor depends on

Question # 19

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

Question # 20

A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is

Question # 21

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

Question # 22

The unit of resistivity is

Question # 23

The SI unit of permitivity is

Question # 24

The SI unit of electric field intensity is

Question # 25

Ohm's law states that

Question # 26

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 # 27

The electric intensity at infinite distance from the point charge will be

Question # 28

Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be

Question # 29

The earth's potential is taken as

Question # 30

The ohm's is defined as

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Cause of heat production in a current carrying conductor is
A. Collisions of free electrons with one another
B. High drift speed of free electrons
C. Collisions of free electrons with atoms or ions of conductor
D. High resistance value
2 The capacity of a parallel plat capacitor depends on the
A. Type to metal used
B. Thickness of plates
C. Potential applied across the plates
D. Separation between the plates
3 The electric flux from a closed surface
A. Is independent of the shape of the surface
B. Depends on the charge enclosed by the surface
C. Both a and b
D. None of the above
4 In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19C. The number of excess electrons on the drop is
A. 3.9
B. 4
C. 4.2
D. 6
5 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
A. 2 R
B. R
C. R/2
D. R/4
6 The resistance of an incandescent lamp is
A. Smaller when switched on
B. Greater when switched off
C. The same whether it is switch off or switch on
D. Greater when switched on
7 Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?
A. 3RΩ
B. 2R/4Ω
C. R/3Ω
D. 2R/3Ω
8 Surface density of charge is defined as
A. Charge per unit volume
B. Charge per unit length
C. Charge per unit area
D. Charge per unit mass
9 Heating effect caused by an electric circuit is written
A. H = I2Rt
B. H = I2R
C. H = IR2t
D. H = IR2
10 Resistance of a conductor is increased, the currant will
A. Decrease
B. Increase
C. Remain the same
D. None of these

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