set 6 MCQ Questions & Answers Detailed Explanation

Question : 1

An AC generator of 220 V having internal resistance r = 10Ω and external resistance R = 100Ω. What is the power developed in the external circuit?

a) 400 W

b) 441 W

c) 484 W

d) 369 W

Question : 2

Consider the following statements :

1. Magnetic field produced by current in a straight wire has no poles.
2. The magnetic lines of force produced by a straight current carrying conductor are straight in nature.
3. To produce a strong magnetic field at its centre, we prefer a current carrying wire loop of larger radius.

a) 1 only

b) 1 and 3

c) 2 only

d) 1, 2 and 3

Question : 3

Out of the following, diamagnetic substance is

a) lead

b) iron

c) copper

d) silver

Question : 4

The universal properties of all substances is

a) paramagnetism

b) diamagnetism

c) ferromagnetism

d) All of these

Question : 5

Which is the gas inside an electric bulb?

a) Carbon dioxide

b) Argon

c) Nitrogen

d) Both (A) and (B)

Question : 6

The charge given to any conductor resides on its outer surface, because

a) the free charge tends to be in its minimum kinetic energy state

b) the free charge tends to be in its maximum potential energy state.

c) the free charge tends to be in its minimum potential energy state

d) the free charge tends to be in its maximum kinetic energy state