ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Question # 1

Ohm is the unit of

Question # 2

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

Question # 3

The speed of randomly moving electrons depends upon

Question # 4

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

Question # 5

An electric dipole is at the centre of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)

Question # 6

Ohm's law states that

Question # 7

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

Question # 8

The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

The conductivity of a superconductor is

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

Electron volt is the unit of.

Question # 17

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

Question # 18

The ohm's is defined as

Question # 19

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

Question # 20

The nature of capacity of electrostatic capacitor depends on

Question # 21

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 # 22

The value of electrical constant of proportionality k is

Question # 23

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is

Question # 24

The charge carriers in electrolyte are positive and negative

Question # 25

The earth's potential is taken as

Question # 26

In bringing an electron towards another electron, electrostatic potential energy of system

Question # 27

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

Question # 28

The liquid which conduct current is known as

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The speed of randomly moving electrons depends upon
A. pressure
B. volume
C. temperature
D. mass
2 Resistance of a conductor depends upon
A. the quantity of current passing through it
B. the voltage applied between its end
C. its dimensions, physical state and nature of its material
D. all of the above
3 The resistivity of a substance depends upon the
A. length
B. mass
C. area
D. temperature
4 A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?
A. 108 g
B. 10.8 g
C. 0.8 g
D. 108/0.8 g
5 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
A. 7.20 N
B. 11.25 N
C. 22.50 N
D. 45.00
6 One joule is equal to
A. 1.6 x 1019eV
B. 6.25 x 1018eV
C. 1.6 x 1818eV
D. 6.25 x 1019eV
7 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
8 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
9 The dot product of electric field intensity E and vector area A is called
A. Electric potential
B. Electric flux
C. Electric field
D. Magnetic field
10 Some charge is being given to a conductor. Then its potential
A. Is maximum at surface
B. Is maximum at centre
C. Is remain same throughout the conductor
D. Is maximum somewhere between surface and centre

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