Electronic Devices-Semiconductor Diode (NEET Physics): Questions 11 - 14 of 15

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Question number: 11

» Electronic Devices » Semiconductor Diode

MCQ▾

Question

Pure silicon has equal electron and holes concentration of 1.5 × 10 16 m -3. Doping by indium increases holes concentration to 4.5 × 10 22 m -3. The electron concentration in the doped silicon is,

Choices

Choice (4) Response

a.

3 × 10 9 m -3

b.

6 × 10 9 m -3

c.

4 × 10 9 m -3

d.

5 × 10 9 m -3

Question number: 12

» Electronic Devices » Semiconductor Diode

Assertion-Reason▾

Assertion (Ꭺ)

The number of electrons in a P-type silicon semiconductor is less than the number of electrons in a pure silicon semiconductor at room temperature.

Reason (Ꭱ)

It is due to law of mass action.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are false

Question number: 13

» Electronic Devices » Semiconductor Diode

MCQ▾

Question

A piece of copper and the other of germanium are cooled from the room temperature to 80 K, then which of the following would be wrong statements?

(1) Resistance of each Increase

(2) Resistance of each Decrease

(3) Resistance of copper increases while that of germanium decreases

(4) Resistance of copper decreases while that of germanium increases

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

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

2 and 4 are correct

c.

1 and 2 are correct

d.

1, 2 and 3 are correct

Question number: 14

» Electronic Devices » Semiconductor Diode

Appeared in Year: 2016

MCQ▾

Question

The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance Equation will be –

A circuit having two diodes

A Circuit Having Two Diodes

Figure shows a circuit having two ideal diodes connected.

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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