ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

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

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

Question # 2

The ohm's is defined as

Question # 3

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 # 4

Which of the following does not obey ohm's law?

Question # 5

What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts?

Question # 6

The electric flux is linked with a surface will be maximum when

Question # 7

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

Question # 8

The resistance of the given conductor can be increased by

Question # 9

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

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 SI unit of capacitance is

Question # 12

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

Question # 13

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

Question # 14

Magnetic effect at a point caused due to flow a current depend upon the

Question # 15

In a charged capacitor the energy is stored in

Question # 16

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

Question # 17

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

Question # 18

Electric flux is defined by the relation

Question # 19

The SI unit of current is

Question # 20

Ohm established a relation between

Question # 21

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 # 22

The liquid which conduct current is known as

Question # 23

Ohm is the unit of

Question # 24

Which one of the following causes production of heat when current is set up in a wire?

Question # 25

The unit of conductance is

Question # 26

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 # 27

Electron volt is the unit of

Question # 28

In a voltmeter the conduction takes place due to

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J
A. 5
B. 0.5
C. 0.005
D. 50
2 The relation between charge 'Q' and current 'I' is given by
A. Q = I/t
B. Q = It
C. Q = I2t
D. Q = I2/t
3 When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be
A. 180 watt
B. 10 watt
C. 20 watt
D. 60 watt
4 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
5 The charge carriers in gases are
A. electrons
B. ions
C. protons
D. ions and electrons
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 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
A. -10 N
B. +10 N
C. +20 N
D. -20 N
8 The potential difference across each resistance in series combination is
A. same
B. different
C. zero
D. none of these
9 Resistor is a device which convert electric energy to
A. Heat energy
B. Chemical energy
C. Elastic energy
D. All of the above
10 A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then
A. The charge in the plates reduces and potential difference increase
B. Potential difference between the plates increase, stored energy decreases and charge remains the same
C. Potential difference between the plates decreases and charge remains unchanged
D. None of the above

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