Electronic Devices (NEET Physics): Questions 1 - 4 of 65

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Question number: 1

» Electronic Devices » Semiconductors

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 P-type germanium

c.

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

d.

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

Question number: 2

» Electronic Devices » Semiconductor Diode

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.

2 and 4 are correct

b.

1, 2 and 3 are correct

c.

1 and 3 are correct

d.

1 and 2 are correct

Question number: 3

» Electronic Devices » Semiconductors

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

Assertion-Reason▾

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.

Ꭺ is false but Ꭱ is true

b.

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

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

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