ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 12 Electrostatics

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

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ECAT Pre General Science Physics Chapter 12 Electrostatics

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Question # 1

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

Question # 2

The potential difference across each resistance in series combination is

Question # 3

The electric lines of force are

Question # 4

The electric field intensity at a point due to a point charge

Question # 5

The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to

Question # 6

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

Question # 7

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 # 8

Capacitance of two or more capacitors

Question # 9

If the length of the conductor is double and its cross sectional area is halved, its conductance will

Question # 10

The ohm's is defined as

Question # 11

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

Question # 12

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 # 13

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

Question # 14

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

Question # 15

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

Question # 16

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

Question # 17

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

Question # 18

The resistance of the given conductor can be increased by

Question # 19

In a voltmeter the conduction takes place due to

Question # 20

A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

Question # 21

The conductivity of a superconductor is

Question # 22

The SI unit of electric flux is

Question # 23

Electric flux is defined by the relation

Question # 24

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is

Question # 25

Electron volt is the unit of

Question # 26

The capacity of a parallel plat capacitor depends on the

Question # 27

The minimum charge on any object can not be less than

Question # 28

The liquid which conduct current is known as

Question # 29

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 The graphical representation of ohm's law is
A. hyperbola
B. straight line
C. ellipse
D. parabola
3 The electric field will be uniform
A. Near a positive point charge
B. Near a negative point charge
C. Between two oppositely charged parallel metal plates
D. None of above
4 The electric lines of force are
A. Imaginary
B. Physically existing everywhere
C. Physically existing near the charge
D. All of the above
5 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
6 Capacitance of two or more capacitors
A. Increases in series combination
B. Increases in parallel combination
C. Remains unchanged
D. None of the above
7 A closed surface contains two equal and opposite charges. The net electric flux from the surface will be
A. Negative
B. Positive
C. Infinite
D. Zero
8 Thermocouple is an arrangement of two different metals
A. To convert heat energy in to electrical energy
B. To produce more heat
C. To convert heat energy into chemical energy
D. To convert electric energy in to heat energy
9 The SI unit of current is
A. watt
B. coulomb
C. volt
D. ampere
10 If the distance of separation between two chares is increased, the electrical potential energy of the system will
A. Increase
B. Decrease
C. May increase or decrease
D. Remain the same

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