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

The nature of capacity of electrostatic capacitor depends on

Question # 2

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

Question # 3

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

Question # 4

Physicist George Simon ohm was a

Question # 5

The value of electrical constant of proportionality k is

Question # 6

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

Question # 7

Consider a spherical shell of metal at he centre of which a positive point charge is kept

Question # 8

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

Question # 9

Coulomb force, when any material medium is placed between two charges

Question # 10

The charge carriers in electrolyte are positive and negative

Question # 11

If a 40 watt light bulb burns for 2 hours. how much heat is generated

Question # 12

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

Question # 13

The resistance of the given conductor can be increased by

Question # 14

The earth's potential is taken as

Question # 15

If the two charges in Coulomb's law have double distance between them, then electric force

Question # 16

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

Question # 17

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

Question # 18

The electric flux from a closed surface

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

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

Question # 21

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

Question # 22

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

Question # 23

Battery is charged in motor cars, which is based on

Question # 24

The thermistors are usually made of

Question # 25

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

Question # 26

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 # 27

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

Question # 28

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

Question # 29

Capacitance of two or more capacitors

Question # 30

The energy stored in a charge capacitor

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if
A. They have the same potential
B. They have the same amount of charge
C. They have the same capacity
D. They have the same shape
2 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?
A. 60 W bulb
B. 100 W bulb
C. Both equally
D. None of these
3 The energy stored in a charge capacitor
A. 1/2CV2
B. 1/2C2V
C. 1/2C/V2
D. None of these
4 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
A. 0.4 A
B. 11.4 A
C. 9.8 A
D. 10.6 A
5 The conductivity of a superconductor is
A. Infinite
B. Very large
C. Very small
D. Zero
6 One coulomb per second is equal to
A. One volt
B. One ampere
C. One hom
D. One henry
7 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
A. 25
B. 225
C. 625
D. 1250
8 The resistivity of a substance depends upon the
A. length
B. mass
C. area
D. temperature
9 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
10 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

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