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

If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be

Question # 2

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

Question # 3

The resistivity of a substance depends upon the

Question # 4

Ohm is the unit of

Question # 5

Electric generators which convert mechanical energy into

Question # 6

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 # 7

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

Question # 8

One electron volt is equal to

Question # 9

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

Question # 10

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

Question # 11

The relation between charge 'Q' and current 'I' is given by

Question # 12

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

Question # 13

In a charged capacitor the energy is stored in

Question # 14

One coulomb of charge is created by

Question # 15

A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is

Question # 16

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 # 17

The concept of field theory was put forward by

Question # 18

The nature of capacity of electrostatic capacitor depends on

Question # 19

Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become

Question # 20

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

Question # 21

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

Question # 22

A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be

Question # 23

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

Question # 24

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

Question # 25

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 # 26

The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is

Question # 27

The minimum charge on any object can not be less than

Question # 28

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

Question # 29

A car battery has e.m.f 12 volt and internal resistance 5 x 10-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

Question # 30

Electric flux is defined by the relation

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Solar cell converts sunlight directly into
A. potential energy
B. thermal energy
C. mechanical energy
D. electrical energy
2 The energy stored in a charge capacitor
A. 1/2CV2
B. 1/2C2V
C. 1/2C/V2
D. None of these
3 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
4 The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is
A. 21 x 103+ 10%
B. 23 x 101+ 10%
C. 21 x 103+ 5%
D. 12 x 103+ 5%
5 The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is
A. 4/5Ω
B. 5/4Ω
C. 20Ω
D. 0.05 Ω
6 The resistance of a conductor does not depend on its
A. mass
B. resistivity
C. length
D. cross-sectional area
7 The SI unit of conductivity is
A. ohm-m
B. ohm-1m-1
C. ohm-m-1
D. ohm-1m
8 Which one of the following is the unit of electric field intensity
A. JC-1
B. Vm-1
C. Cm-1
D. CJ-1
9 The electric intensity at infinite distance from the point charge will be
A. Infinite
B. Positive
C. Zero
D. Negative
10 In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called
A. Time constant
B. Decay constant
C. None of these
D. All of above

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