Electronic Devices (NEET Physics): Questions 25 - 28 of 65

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Question number: 25

» Electronic Devices » Semiconductor Diode

MCQ▾

Question

In the given figure, which of the diodes are forward biased?

Circuit diagram consists of PN- junction diode and resistor

Circuit Diagram Consists of PN- Junction Diode and Resistor

In circuit a PN- junction diode is connected with a resistor in series.

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

Codes:

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 2 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

Question number: 26

» Electronic Devices » Semiconductor Diode

MCQ▾

Question

In a triclinic crystal system,

Choices

Choice (4) Response

a.

a=b=c,αβγ

b.

a=b=c,α=β=γ

c.

abc,αβ=γ

d.

abc,αβγ

Question number: 27

» 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: 28

» 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

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