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

Cause of heat production in a current carrying conductor is

Question # 2

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

Question # 3

Resistor is a device which convert electric energy to

Question # 4

Resistance of a conductor is increased, the currant will

Question # 5

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 # 6

The graphical representation of ohm's law is

Question # 7

Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then

Question # 8

The thermistors are usually made of

Question # 9

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 # 10

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 # 11

The unit of resistance is

Question # 12

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 # 13

The resistivity of a substance depends upon the

Question # 14

The earth's potential is taken as

Question # 15

Specific resistance of a wire depends upon

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 If the length of the conductor is double and its cross sectional area is halved, its conductance will
A. Increase four fold
B. Become one-fourth
C. Become one-half
D. Remains unchanged
2 At any point on the right bisector of the line joining two equal and opposite charges
A. At electric field is zero
B. The electric potential is zero
C. The electric potential decreases with increasing distance from the centre
D. The electric field is perpendicular to the line joining the charges
3 The value of electrical constant of proportionality k is
A. 9 x 109Nm2C-2
B. 9 x 10-9Nm2C-2
C. 9 x 1010Nm2C2
D. 9.85 x 10-12N-1C-2
4 The electric intensity outside the two oppositely charged parallel metal plates is
A. Maximum
B. Minimum
C. Zero
D. Infinite
5 If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be
A. 5μF
B. 20μF
C. 10μF
D. 15μF
6 The capacity of a parallel plat capacitor depends on the
A. Type to metal used
B. Thickness of plates
C. Potential applied across the plates
D. Separation between the plates
7 The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately
A. 9.8
B. 24 x 1019
C. 24 x 1042
D. 24 x 10-44
8 The unit of resistivity is
A. ohm
B. ohm-m2
C. ohm-meter
D. ohm-m-1
9 One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is
A. 0.1 V
B. 8 V
C. 2 V
D. 0.5 V
10 The concept of field theory was put forward by
A. Franklin
B. Kepler
C. Oersted
D. Michael Faraday

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