set 9 MCQ Questions & Answers Detailed Explanation

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The following question based on electric current and magnetism topic of general science mcq

Questions : 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

The correct answers to the above question in:

Answer: (b)

Silicon is an indirect-band gap semi-conductor. CB VB Donor level

physics semiconductor electronics mcq question answer 28 hint

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Question : 1

If the conductivity of a semiconductor is only due to break up of the covalent bonds due to thermal excitation, then the semiconductor is called

a) extrinsic

b) donor

c) intrinsic

d) acceptor

Answer: (c)

Question : 2

A wire with black insulation during electric supply is

a) Neutral wire

b) Live wire

c) Earth wire

d) Fuse wire

Answer: (a)

Question : 3

On charging by conduction, mass of a body may

a) decreases

b) increase or decrease

c) increase

d) none of these

Answer: (b)

On charging by conduction, body may gain mass, if it acquires negative charge. It may lose mass, if it acquires positive charge.

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