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

Cause of heat production in a current carrying conductor is

Question # 2

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

Question # 3

The dot product of electric field intensity E and vector area A is called

Question # 4

The minimum charge on any object can not be less than

Question # 5

Battery is charged in motor cars, which is based on

Question # 6

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

Question # 7

The resistivity of a substance depends upon the

Question # 8

The thermistors are usually made of

Question # 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

Question # 10

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

Question # 11

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 # 12

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

Question # 13

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

Question # 14

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

Question # 15

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

Question # 16

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

Question # 17

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

Question # 18

In a voltmeter the conduction takes place due to

Question # 19

The SI unit of conductivity is

Question # 20

A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is

Question # 21

The energy stored in a charge capacitor

Question # 22

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

Question # 23

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

Question # 24

The electric flux from a closed surface

Question # 25

The unit of resistance is

Question # 26

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

Question # 27

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 # 28

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

Question # 29

The graphical representation of ohm's law is

Question # 30

The SI unit of electric flux is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts
A. 1310 W
B. 670 W
C. 810 W
D. 1210 W
2 Thermocouple is an arrangement of two different metals
A. To convert heat energy in to electrical energy
B. To produce more heat
C. To convert heat energy into chemical energy
D. To convert electric energy in to heat energy
3 A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then
A. The charge in the plates reduces and potential difference increase
B. Potential difference between the plates increase, stored energy decreases and charge remains the same
C. Potential difference between the plates decreases and charge remains unchanged
D. None of the above
4 The electrode connected with the positive terminal of the current source is called
A. cathode
B. anode
C. electrolyte
D. position
5 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
6 One coulomb of charge is created by
A. 10 electrons
B. 1.6 x 10-19electrons
C. 6.25 x 1018electrons
D. 6.25 x 1021electrons
7 Consider a spherical shell of metal at he centre of which a positive point charge is kept
A. The electric filed is zero outside the shell
B. The electric field is zero everywhere
C. The electric field is zero in the region inside the shell
D. The electric field is non-zero in both regions outside and inside the shell
8 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
9 Cause of heat production in a current carrying conductor is
A. Collisions of free electrons with one another
B. High drift speed of free electrons
C. Collisions of free electrons with atoms or ions of conductor
D. High resistance value
10 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

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