Electronic Devices-Semiconductors (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 15 - 18 of 23

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Question number: 15

» Electronic Devices » Semiconductors

MCQ▾

Question

The forbidden energy band gap in conductors, semiconductors and insulators are EG 1, EG 2 and EG 3 respectively. The relation among them is

Choices

Choice (4) Response

a.

EG 1 < EG 2 > EG 3

b.

EG 1 = EG 2 = EG 3

c.

EG 1 > EG 2 > EG 3

d.

EG 1 < EG 2 < EG 3

Question number: 16

» Electronic Devices » Semiconductors

MCQ▾

Question

Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of P increases and that of Q decreases. We conclude that,

Choices

Choice (4) Response

a.

P is conductor and Q is semiconductor

b.

P is n-type semiconductor and Q is p-type semiconductor

c.

P is semiconductor and Q is conductor

d.

P and Q are conductors of different materials

Question number: 17

» Electronic Devices » Semiconductors

Assertion-Reason▾

Assertion (Ꭺ)

Conductivity of a semiconductor increases on doping.

Reason (Ꭱ)

On doping the temperature of the semiconductor increases.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

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

d.

Ꭺ is false but Ꭱ is true

Question number: 18

» Electronic Devices » Semiconductors

Assertion-Reason▾

Assertion (Ꭺ)

The resistivity of a semiconductor decreases with temperature.

Reason (Ꭱ)

The atoms of a semiconductor vibrate with larger amplitude at higher temperature there by increasing its resistivity.

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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