ECAT Pre Computer Science Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 12 Electrostatics

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

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ECAT Physics Chapter 12 Electrostatics

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Question # 1

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

Question # 2

Electric flux is defined by the relation

Question # 3

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

Question # 4

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

Question # 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

Question # 6

Ohm's law states that

Question # 7

One coulomb per second is equal to

Question # 8

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

Question # 9

The electric lines of force are

Question # 10

The thermistors are usually made of

Question # 11

The unit of intensity of electric field is

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The minimum charge on any object can not be less than
A. 1.6 x 10-19C
B. 3.2 x 10-19C
C. 1.0 C
D. 4.8 x 10-19C
2 The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will
A. Increase
B. Decrease
C. Remain F
D. Become 10F/9
3 Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then
A. R1= 2R2
B. R2= 2R1
C. R2 = 4R1
D. R1= 4R2
4 Current provided by a battery is maximum when
A. Internal resistance equal to external resistance
B. Internal resistance is greater than external resistance
C. Internal resistance is less then external resistance
D. None of these
5 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
6 The unit of resistance is
A. volt
B. ampere
C. ohm
D. coat
7 In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be
A. 2 R
B. R/4
C. R/2
D. R
8 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
9 An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be
A. V/e
B. eV
C. e/V
D. V
10 The conductivity of a superconductor is
A. Infinite
B. Very large
C. Very small
D. Zero

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