Electronic Devices-Semiconductors (NEET Physics): Questions 10 - 14 of 23

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Question number: 10

» Electronic Devices » Semiconductors

MCQ▾

Question

Choose the correct statement

Choices

Choice (4) Response

a.

When we heat a semiconductor its resistance decreases

b.

When we heat a semiconductor its resistance increases

c.

Resistance of a semiconductor is independent of temperature

d.

When we cool a semiconductor to 0 K then it becomes superconductor

Question number: 11

» 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: 12

» 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: 13

» 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: 14

» 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

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