Electronic Devices [NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 4 of 81

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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 » Semiconductor Diode

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MCQ▾

Question

Which of the following materials are crystalline?

(1) Copper (2) Sodium chloride

(3) Diamond (4) Wood

Select the correct answers and mark it according to the following codes:

Choices

Choice (4)Response

a.

1 and 2 are correct

b.

1,2 and 3 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

Question number: 3

» 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: 4

» 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

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