Electronic Devices-Semiconductors (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 4 of 23

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Question number: 1

» Electronic Devices » Semiconductors

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MCQ▾

Question

Electronic configuration of germanium is 2,8, 18 and 4. To make it extrinsic semiconductor small quantity of antimony is added,

Choices

Choice (4) Response

a.

The material obtained will be N-type germanium which has less electrons than holes at room temperature

b.

The material obtained will be N-type germanium in which electrons and holes are equal in number

c.

The material obtained will be N-type germanium which has more electrons than holes at room temperature

d.

The material obtained will be P-type germanium

Question number: 2

» Electronic Devices » Semiconductors

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MCQ▾

Question

The energy band gap of Si is

Choices

Choice (4) Response

a.

0.70 eV

b.

1.1 eV

c.

Between 0.70 eV

d.

5eV

Question number: 3

» Electronic Devices » Semiconductors

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Assertion-Reason▾

Question

Assertion (Ꭺ)

The temperature coefficient of resistance is positive for p-type semiconductors and negative for n-type semiconductors.

Reason (Ꭱ)

The effective charge carries in p-type semiconductors and holes and in n-type semiconductors are electrons.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

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

Question number: 4

» Electronic Devices » Semiconductors

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MCQ▾

Question

The reverse biasing in a PN junction diode

Choices

Choice (4) Response

a.

Increases the potential barrier

b.

Increases the number of minority charge carriers

c.

Increases the number of majority charge carriers

d.

Decreases the potential barrier

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