Electronic Devices (NEET Physics): Questions 29 - 33 of 67

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Question number: 29

» 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: 30

» 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: 31

» 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

Question number: 32

» Electronic Devices » Semiconductors

MCQ▾

Question

The energy gap for diamond is nearly

Choices

Choice (4) Response

a.

2 eV

b.

1 eV

c.

6 eV

d.

4 eV

Question number: 33

» Electronic Devices » Semiconductors

MCQ▾

Question

The intrinsic semiconductor becomes an insulator at

Choices

Choice (4) Response

a.

-100°C

b.

0 K

c.

0°C

d.

300 K

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