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 ohm's is defined as

Question # 2

The charge carriers in electrolyte are positive and negative

Question # 3

The SI unit of electric flux is

Question # 4

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

Question # 5

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

Question # 6

In a charged capacitor the energy is stored in

Question # 7

The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is

Question # 8

The SI unit of current is

Question # 9

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

Question # 10

The electrode connected with the positive terminal of the current source is called

Question # 11

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 # 12

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

Question # 13

The electric flux is linked with a surface will be maximum when

Question # 14

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

Question # 15

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

Question # 16

The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become

Question # 17

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

Question # 18

Electric generators which convert mechanical energy into

Question # 19

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 # 20

Solar cell converts sunlight directly into

Question # 21

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

Question # 22

The electric field will be uniform

Question # 23

Electron volt is the unit of.

Question # 24

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

Question # 25

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

Question # 26

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 # 27

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 # 28

The potential difference across each resistance in series combination is

Question # 29

A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is
A. 10 KJ
B. 5 KJ
C. 2 KJ
D. 1 KJ
2 The earth's potential is taken as
A. Negative
B. Positive
C. Zero
D. Infinite
3 The ohm's is defined as
A. 1 ampere / 1 volts
B. 1 coulomb / 1 volt
C. 1 volt / 1 ampere
D. 1 volt / 1 coulomb
4 The speed of randomly moving electrons depends upon
A. pressure
B. volume
C. temperature
D. mass
5 The charge per unit time through any cross-section of a conductor is called
A. capacitance
B. electric power
C. current
D. potential difference
6 Ohm's law states that
A. The current through a resistor is directly proportional to the applied voltage
B. The voltage across a resistor is directly proportional to the current passing through it
C. Resistance is the constant of proportionality between the voltage and current
D. all of these
7 The nature of capacity of electrostatic capacitor depends on
A. Shape
B. Size
C. Thickness of plates
D. Area
8 The electric intensity at infinite distance from the point charge will be
A. Infinite
B. Positive
C. Zero
D. Negative
9 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
A. -10 N
B. +10 N
C. +20 N
D. -20 N
10 Two point charges A and B separated by a distance R attract each other with a force of 12 x 10-3N. The force between A and B when the charges on them are doubled and distance is halved
A. 1.92 N
B. 19.2 N
C. 12 N
D. 0.192 N

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