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

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

Question # 2

The capacitance of a parallel plate capacitor depends upon

Question # 3

Resistance of a conductor is increased, the currant will

Question # 4

Electron volt is the unit of.

Question # 5

The energy stored in a charge capacitor

Question # 6

The electric flux from a closed surface

Question # 7

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 # 8

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

Question # 9

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

Question # 10

A condenser of capacity 50μF is charged to 10 V.The energy stored is

Question # 11

The current through a metallic conductor is due to the motion of

Question # 12

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 # 13

Surface density of charge is defined as

Question # 14

The charge carriers in gases are

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

The unit of conductance is

Question # 17

Some charge is being given to a conductor. Then its potential

Question # 18

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

Question # 19

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 # 20

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

Question # 21

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

Question # 22

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

Question # 23

The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately

Question # 24

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

Question # 25

Which of the following represents an electric current?

Question # 26

Which one of the following is the unit of electric field intensity

Question # 27

The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of

Question # 28

The ohm's is defined as

Question # 29

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

Question # 30

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J
A. 5
B. 0.5
C. 0.005
D. 50
2 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
3 A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor
A. Increases
B. Decreases
C. Remain unchanged
D. Becomes infinite
4 In bringing an electron towards another electron, electrostatic potential energy of system
A. Decreases
B. Increases
C. Remains uncharged
D. Becomes zero
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
A. Zero
B. 10Ω
C. 1Ω
D. 0.10Ω
6 Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be
A. 0.52 A
B. 1 mA
C. 0.7 mA
D. 1.4 A
7 The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is
A. Q=V/C
B. Q=C/V
C. Q=1/2CV
D. Q=CV
8 Potentiometer is more sensitive than voltmeter, because
A. Voltmeter has a very high resistance
B. Voltmeter has a very low resistance
C. Potentiometer does not draw any current from a source of unknown potential difference
D. Potentiometer is sensitive
9 The powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be
A. 1 : 2
B. 2 : 1
C. 1 : 4
D. 4 : 1
10 The speed of randomly moving electrons depends upon
A. pressure
B. volume
C. temperature
D. mass

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