set 6 MCQ Questions & Answers Detailed Explanation

Question : 1

Which one of the following heater element is used in electric press?

a) Nichrome wire

b) Lead wire

c) Copper wire

d) Iron wire

Question : 2

Which of the following is the best insulator of electricity?

a) Paper

b) Graphite

c) Carbon

d) Ebonite

Question : 3

When a semiconductor is heated, its resistance

a) increases

b) remains unchanged

c) decreases

d) either (b) or (c)

Question : 4

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 : 5

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 : 6

Inverter converts

a) direct current into alternating current

b) current at low voltage to current at high voltage

c) alternating current into direct current

d) None of these