set 9 MCQ Questions & Answers Detailed Explanation

Question : 1

Which one of the following is not a correct statement about semiconductors?

a) In an n-type semiconductor, the Fermi level lies closer to the conduction band edge

b) Silicon is a direct band gap semiconductor

c) The electrons and holes have different mobilities in a semiconductor

d) Silicon is has diamond structure

Question : 2

A wire with black insulation during electric supply is

a) Neutral wire

b) Live wire

c) Earth wire

d) Fuse wire

Question : 3

On charging by conduction, mass of a body may

a) decreases

b) increase or decrease

c) increase

d) none of these

Question : 4

Consider the following statements regarding a motor car battery:

1. The voltage is usually 12 V.
2. Electrolyte used is hydrochloric acid.
3. Electrodes are lead and copper.
4. Capacity is expressed in ampere-hour.

a) 3 and 4

b) 1 and 2

c) 2 and 3

d) 1 and 4