set 6 MCQ Questions & Answers Detailed Explanation

Question : 1

Turbines and Dyanamos are used to convert which energy to electrical energy?

a) Mechanical energy

b) Chemical energy

c) Solar energy

d) Magnetic energy

Question : 2

The resistance of a thin wire in comparison of a thick wire of the same material

a) is equal

b) depends upon the metal of the wire

c) is low

d) is high

Question : 3

Which of the following metals is used as filament in lighting bulbs?

a) Silver

b) Iron

c) Molybdenum

d) Tungsten

Question : 4

Which of the following is most suitable for the core of electromagnets?

a) Copper-nickel alloy

b) Soft iron

c) Steel

d) Air

Question : 5

Coulomb’s law is true for

a) nuclear distances (= 10^–15 m)

b) charged as well as uncharged particles

c) atomic distances (= 10^–11 m)

d) all the distances

Question : 6

Graphene is frequently in news recently. What is its importance?

1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and has high optical transparency.
4. It can be used as ‘conducting electrodes’ required for touch screens, LCDs and organic LEDs.

a) 1, 2 and 4 only

b) 1 and 2 only

c) 3 and 4 only

d) 1, 2, 3 and 4