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

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

Question # 2

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

Question # 3

The SI unit of permitivity is

Question # 4

The electric field due to an infinite long thin wire at a distance R varies as

Question # 5

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

Question # 6

Electron volt is the unit of.

Question # 7

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

Question # 8

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

Question # 9

One coulomb of charge is created by

Question # 10

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

Question # 11

The SI unit of current is

Question # 12

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

Question # 13

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

Question # 14

The electric lines of force are

Question # 15

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

Question # 16

Solar cell converts sunlight directly into

Question # 17

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

Question # 18

The earth's potential is taken as

Question # 19

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

Question # 20

Battery is charged in motor cars, which is based on

Question # 21

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

Question # 22

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

Question # 23

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

Question # 24

Coulomb force, when any material medium is placed between two charges

Question # 25

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

Question # 26

A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?

Question # 27

The concept of field theory was put forward by

Question # 28

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 # 29

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

Question # 30

The resistance of a conductor does not depend on its

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 The electric intensity at infinite distance from the point charge will be
A. Infinite
B. Positive
C. Zero
D. Negative
4 The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is
A. 9 x 105V
B. 9 V
C. 8 x 106V
D. 80 V
5 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
6 At ordinary temperature, an increase in temperature increases the conductivity of
A. Conductor
B. Semiconductor
C. Insulator
D. Alloy
7 If electric and gravitational force on an electron in a uniform electric field will be
A. E=mg/q
B. E=q/mg
C. E=,g/q
D. E=qg/m
8 The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is
A. 21 x 103+ 10%
B. 23 x 101+ 10%
C. 21 x 103+ 5%
D. 12 x 103+ 5%
9 When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates
A. Decreases
B. Increases
C. No change
D. May increase or decresase
10 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

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