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

Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends

Question # 2

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

Question # 3

The charge per unit time through any cross-section of a conductor is called

Question # 4

Equal charges are given to two spheres of different radii. The potential will

Question # 5

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 # 6

Surface density of charge is defined as

Question # 7

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

Question # 8

The capacity of a parallel plat capacitor depends on the

Question # 9

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 # 10

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

Question # 11

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

Question # 12

The charge carriers in gases are

Question # 13

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

Question # 14

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 # 15

Battery is charged in motor cars, which is based on

Question # 16

The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of

Question # 17

The fractional change in resistance per kelvin is known as

Question # 18

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

Question # 19

The earth's potential is taken as

Question # 20

The conductivity of a superconductor is

Question # 21

Heating effect caused by an electric circuit is written

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be

Question # 27

In a charged capacitor the energy is stored in

Question # 28

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

Question # 29

One coulomb of charge is created by

Question # 30

Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The electric flux is linked with a surface will be maximum when
A. The surface is held parallel to the electric field
B. The surface is held perpendicular to the electric field
C. The surface makes an angle of 45° with the electric field
D. All of the above
2 Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then
A. R1= 2R2
B. R2= 2R1
C. R2 = 4R1
D. R1= 4R2
3 The unit of resistance is
A. volt
B. ampere
C. ohm
D. coat
4 In bringing an electron towards another electron, electrostatic potential energy of system
A. Decreases
B. Increases
C. Remains uncharged
D. Becomes zero
5 The charge carriers in gases are
A. electrons
B. ions
C. protons
D. ions and electrons
6 The current through a metallic conductor is due to the motion of
A. protons
B. neutrons
C. electrons
D. free electrons
7 If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be
A. 0.1 watt
B. 1 watt
C. 10 watt
D. 100 watt
8 A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be
A. Zero
B. 10Ω
C. 1Ω
D. 0.10Ω
9 If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be
A. 0.1 watt
B. 1 watt
C. 10 watt
D. 100 watt
10 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

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