ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

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

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Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Question # 1

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 # 2

A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to

Question # 3

A conducting wire is drawn to double its length. Final resistivity of the material will be

Question # 4

The ohm's is defined as

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

In a voltmeter the conduction takes place due to

Question # 7

The SI unit of conductivity is

Question # 8

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

Question # 9

The relation V = IR represents

Question # 10

Which of the following represents an electric current?

Question # 11

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

Question # 12

The unit of conductance is

Question # 13

The nature of capacity of electrostatic capacitor depends on

Question # 14

The conductivity of a superconductor is

Question # 15

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 # 16

The dot product of electric field intensity E and vector area A is called

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

Resistance of a conductor depends upon

Question # 19

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

Question # 20

The SI unit of electric flux is

Question # 21

If the distance of separation between two chares is increased, the electrical potential energy of the system will

Question # 22

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

Question # 23

The earth's potential is taken as

Question # 24

In a charged capacitor the energy is stored in

Question # 25

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

Question # 26

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

Question # 27

The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as

Question # 28

One electron volt is equal to

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is
A. Q=V/C
B. Q=C/V
C. Q=1/2CV
D. Q=CV
2 Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be
A. 711μF
B. 611μF
C. 811μF
D. 511μF
3 The speed of randomly moving electrons depends upon
A. pressure
B. volume
C. temperature
D. mass
4 The ohm's is defined as
A. 1 ampere / 1 volts
B. 1 coulomb / 1 volt
C. 1 volt / 1 ampere
D. 1 volt / 1 coulomb
5 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
6 The electric lines of force are
A. Imaginary
B. Physically existing everywhere
C. Physically existing near the charge
D. All of the above
7 The electric intensity outside the two oppositely charged parallel metal plates is
A. Maximum
B. Minimum
C. Zero
D. Infinite
8
Question Image
A. 5μF
B. 10μF
C. 3μF
D. 6μF
9 Which one of the following has larger value of relative permitivity Erat room temperature?
A. Vaccum
B. Air
C. Glass
D. Water
10 Which of the following does not obey ohm's law?
A. Copper
B. Al
C. Diode
D. None

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