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

The relation V = IR represents

Question # 2

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

Question # 3

Heating effect caused by an electric circuit is written

Question # 4

Ohm is the unit of

Question # 5

The resistance of an incandescent lamp is

Question # 6

The SI unit of conductivity is

Question # 7

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

Question # 8

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 # 9

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

Question # 10

A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?

Question # 11

The conductivity of a superconductor is

Question # 12

Solar cell converts sunlight directly into

Question # 13

Coulomb's force between two point charges depends upon

Question # 14

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 # 15

Electric flux is defined by the relation

Question # 16

The SI unit of capacitance is

Question # 17

The resistance of the given conductor can be increased by

Question # 18

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

Question # 19

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is

Question # 20

The powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be

Question # 21

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 # 22

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

Question # 23

A condenser of capacity 50μF is charged to 10 V.The energy stored is

Question # 24

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

Question # 25

Electric generators which convert mechanical energy into

Question # 26

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 # 27

The electrode connected with the positive terminal of the current source is called

Question # 28

The charge carriers in electrolyte are positive and negative

Question # 29

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

Question # 30

The concept of field theory was put forward by

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Ohm established a relation between
A. voltage and resistance
B. voltage and charge
C. voltage and current
D. voltage resistance and charge
2 The current through a metallic conductor is due to the motion of
A. protons
B. neutrons
C. electrons
D. free electrons
3 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
A. q = Q/4
B. q = Q/2
C. q = !
D. None of these
4 The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is
A. 10 KJ
B. 5 KJ
C. 2 KJ
D. 1 KJ
5 A 60 W bulb operates on 220 V supply. The current flowing through the bulb is
A. 11/3 A
B. 3 A
C. 3/11 A
D. 6
6 The substances whose resistance decreases with the increase in temperature these substances have coefficient of
A. positive temperature
B. negative temperature
C. absolute temperature
D. zero temperature
7 An electric charge at rest is
A. Only an electric field
B. Only a magnetic field
C. Both electric and magnetic fields
D. None of the above
8 If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?
A. 60 W bulb
B. 100 W bulb
C. Both equally
D. None of these
9 A conducting wire is drawn to double its length. Final resistivity of the material will be
A. Double of the original one
B. Half of the original one
C. One fourth of the original one
D. Same as original one
10 Electric potential of earth is taken to be zero because the earth is good
A. Semiconductor
B. Conductor
C. Insulator
D. Dielectric

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