Electronic Devices (NEET Physics): Questions 20 - 24 of 65

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Question number: 20

» Electronic Devices » Semiconductors

MCQ▾

Question

Which statement is correct?

Choices

Choice (4) Response

a.

N-type and P-type germanium are neutral

b.

N-type and P-type germanium are negatively charged

c.

N-type germanium is positively charged and P-type germanium is negatively charged

d.

N-type germanium is negatively charged and P-type germanium is positively charged

Question number: 21

» Electronic Devices » Semiconductors

MCQ▾

Question

At zero Kelvin a piece of germanium

Choices

Choice (4) Response

a.

Becomes bad conductor

b.

Becomes good conductor

c.

has maximum conductivity

d.

Becomes semiconductor

Question number: 22

» Electronic Devices » Semiconductors

MCQ▾

Question

When a semiconductor is heated, its resistance

Choices

Choice (4) Response

a.

Increases

b.

Decreases

c.

Nothing is definite

d.

Remains unchanged

Question number: 23

» Electronic Devices » Semiconductors

Assertion-Reason▾

Assertion (Ꭺ)

We can measure the potential barrier of a PN junction by putting a sensitive voltmeter across its terminals.

Reason (Ꭱ)

The current through the PN junction is not same in forward and reversed bias.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

c.

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

d.

Ꭺ is true but Ꭱ is false

Question number: 24

» 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

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