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

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 # 2

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

Question # 3

Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends

Question # 4

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 # 5

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10-3N. The force between A and B when the charges on them are doubled and distance is halved

Question # 6

Electric flux is defined by the relation

Question # 7

Capacitance of two or more capacitors

Question # 8

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

Question # 9

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

Question # 10

The value of electrical constant of proportionality k is

Question # 11

The electric flux from a closed surface

Question # 12

In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called

Question # 13

The resistance of an incandescent lamp is

Question # 14

The electric lines of force are

Question # 15

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

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

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 # 18

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

Question # 19

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

Question # 20

Heating effect caused by an electric circuit is written

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

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 # 23

The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is

Question # 24

One coulomb of charge is created by

Question # 25

The capacitance of a parallel plate capacitor depends upon

Question # 26

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

Question # 27

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

Question # 28

One joule is equal to

Question # 29

The SI unit of conductivity is

Question # 30

Battery is charged in motor cars, which is based on

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Electric generators which convert mechanical energy into
A. solar energy
B. thermal energy
C. kinetic energy
D. electrical energy
2 A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)
A. 2
B. 1
C. 0.5
D. 1.5
3 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
A. Zero
B. F/2
C. F
D. 2F
4 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
A. negative charges
B. positive charges
C. protons
D. electrons
5 The charge carriers in gases are
A. electrons
B. ions
C. protons
D. ions and electrons
6 An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be
A. V/e
B. eV
C. e/V
D. V
7 The fractional change in resistance per kelvin is known as
A. temperature coefficient
B. resistance coefficient
C. super temperature
D. critical temperature
8 One electron volt is equal to
A. 1.6 x 1019eV
B. 6.25 x 1018 eV
C. 1.6 x 1018 eV
D. 6.25 x 1019eV
9 The SI unit of permitivity is
A. Nm2C2
B. N-1m-2C2
C. NmC2
D. Nm2C-1
10 The SI unit of capacitance is
A. Farad
B. Henry
C. Ohm
D. Volt

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