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

Solar cell converts sunlight directly into

Question # 2

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

Question # 3

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

Question # 4

The SI unit of electric flux is

Question # 5

Cause of heat production in a current carrying conductor is

Question # 6

The SI unit of conductivity is

Question # 7

The minimum charge on any object can not be less than

Question # 8

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

Question # 9

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

Question # 10

Which of the following represents an electric current?

Question # 11

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

Question # 12

The charge carriers in electrolyte are positive and negative

Question # 13

The charge per unit time through any cross-section of a conductor is called

Question # 14

The electric field will be uniform

Question # 15

In a voltmeter the conduction takes place due to

Question # 16

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 # 17

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

Question # 18

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 # 19

In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19C. The number of excess electrons on the drop is

Question # 20

In a charged capacitor the energy is stored in

Question # 21

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 # 22

Ohm established a relation between

Question # 23

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

Question # 24

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

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

The electric intensity at infinite distance from the point charge will be

Question # 27

Specific resistance of a wire depends upon

Question # 28

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 # 29

The capacity of a parallel plat capacitor depends on the

Question # 30

Surface density of charge is defined as

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 The SI unit of conductivity is
A. ohm-m
B. ohm-1m-1
C. ohm-m-1
D. ohm-1m
4 The resistance of an incandescent lamp is
A. Smaller when switched on
B. Greater when switched off
C. The same whether it is switch off or switch on
D. Greater when switched on
5 The resistance of the given conductor can be increased by
A. Increasing the area
B. Changing resistivity
C. Decreasing the length
D. None of the above because change does not matter because in any case the volume remains the same
6 A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?
A. 108 g
B. 10.8 g
C. 0.8 g
D. 108/0.8 g
7 An alpha particle is accelerated through a potential difference of 106volt. Its kinetic energy will be
A. 1 MeV
B. 2 MeV
C. 4 MeV
D. 8 MeV
8 The SI unit of electric field intensity is
A. CN-1
B. NC-1or Vm-1
C. JC-1
D. AV-1
9 A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be
A. 64 W
B. 80 W
C. 100 W
D. 125 W
10 Magnetic effect at a point caused due to flow a current depend upon the
A. Quantity of current
B. Distance from current
C. Both the quantity of current and distance from current element
D. None of the all

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