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

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 # 2

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 # 3

Capacitance of two or more capacitors

Question # 4

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

Question # 5

An electric charge at rest is

Question # 6

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

Question # 7

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 # 8

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

Question # 9

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

Question # 10

A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts

Question # 11

A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

Question # 12

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

Question # 13

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

Question # 14

The ohm's is defined as

Question # 15

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 # 16

Ohm's law states that

Question # 17

The capacitance of a parallel plate capacitor depends upon

Question # 18

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

Question # 19

Free electrons are

Question # 20

The SI unit of electric flux is

Question # 21

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

Question # 22

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 # 23

The unit of intensity of electric field is

Question # 24

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 # 25

Thermocouple is an arrangement of two different metals

Question # 26

The resistivity of a substance depends upon the

Question # 27

The charge carriers in gases are

Question # 28

In a charged capacitor the energy is stored in

Question # 29

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

Question # 30

For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be
A. 64 W
B. 80 W
C. 100 W
D. 125 W
2 Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends
A. 120 C
B. 240 C
C. 20 C
D. 4 C
3 One electron volt is equal to
A. 1.6 x 1019eV
B. 6.25 x 1018 eV
C. 1.6 x 1018 eV
D. 6.25 x 1019eV
4 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
A. negative charges
B. positive charges
C. protons
D. electrons
5 The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as
A. voltmeters
B. resistance
C. electrode
D. current
6 The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is
A. 9 x 105V
B. 9 V
C. 8 x 106V
D. 80 V
7 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
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 One coulomb per second is equal to
A. One volt
B. One ampere
C. One hom
D. One henry
10 Ohm established a relation between
A. voltage and resistance
B. voltage and charge
C. voltage and current
D. voltage resistance and charge

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