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

Electron volt is the unit of

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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 # 7

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 # 8

The SI unit of conductivity is

Question # 9

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

Question # 10

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

Question # 11

A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 KV, its kinetic energy will be

Question # 12

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

Question # 13

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

Question # 14

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

Question # 15

An electric charge at rest is

Question # 16

The nature of capacity of electrostatic capacitor depends on

Question # 17

Electron volt is the unit of.

Question # 18

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 # 19

In a voltmeter the conduction takes place due to

Question # 20

Ohm is the unit of

Question # 21

A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

Question # 22

Ohm's law states that

Question # 23

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

Question # 24

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 # 25

The speed of randomly moving electrons depends upon

Question # 26

Free electrons are

Question # 27

Cause of heat production in a current carrying conductor is

Question # 28

The earth's potential is taken as

Question # 29

In a charged capacitor the energy is stored in

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
A. Zero
B. F/2
C. F
D. 2F
2 The SI unit of electric field intensity is
A. CN-1
B. NC-1or Vm-1
C. JC-1
D. AV-1
3 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
4 The electrode connected with the positive terminal of the current source is called
A. cathode
B. anode
C. electrolyte
D. position
5 The electric field due to an infinite long thin wire at a distance R varies as
A. 1/R
B. 1/R2
C. R
D. R2
6 If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be
A. 6 ohm
B. 4 ohm
C. zero ohm
D. 1.33 ohm
7 106electrons are moving through a wire per second, the current developed is
A. 1.6 x 10-19
B. 1 A
C. 1.6 x 10-15 A
D. 106A
8 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
9 The SI unit of permitivity is
A. Nm2C2
B. N-1m-2C2
C. NmC2
D. Nm2C-1
10 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
A. Two
B. 1/2
C. Zero
D. 3/2

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