Electronic Devices-Semiconductors (NEET Physics): Questions 5 - 9 of 23

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Question number: 5

» Electronic Devices » Semiconductors

MCQ▾

Question

The valence band and conduction band of a solid overlap at low temperature, the solid may be

Choices

Choice (4) Response

a.

Semiconductor

b.

Conductors

c.

Insulator

d.

All of the above

Question number: 6

» Electronic Devices » Semiconductors

MCQ▾

Question

Energy bands in solids are a consequence of

Choices

Choice (4) Response

a.

Heisenberg’s uncertainty principle

b.

Ohm’s Law

c.

Pauli’s exclusion principle

d.

Bohr’s theory

Question number: 7

» Electronic Devices » Semiconductors

MCQ▾

Question

Let N h and N e be the number of holes and conduction electrons respectively in a semiconductor. Then

Choices

Choice (4) Response

a.

N e > N h in an intrinsic semiconductor

b.

N h= N e in an extrinsic semiconductor

c.

N h= N e in an intrinsic semiconductor

d.

N h > N e in an intrinsic semiconductor

Question number: 8

» Electronic Devices » Semiconductors

MCQ▾

Question

If N e and Vd be the number of electrons and drift velocity in a semiconductor. When the temperature is increased,

Choices

Choice (4) Response

a.

N e decreases and V d increases

b.

N e and V d increases

c.

N e increases and V d decreases

d.

N e and V d decreases

Question number: 9

» Electronic Devices » Semiconductors

Assertion-Reason▾

Assertion (Ꭺ)

Ohm’s law is obeyed by semiconductors only in low electric fields.

Reason (Ꭱ)

Ohm’s law is not same for weak field and strong electric fields.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are false

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