semiconductor physics class 12 mcq

class 12 physics

Check out semiconductor physics class 12 mcq. This covers the topic like logic gates, transistor, n and p type semiconductor etc. The Types of questions are True/False, Assertion and Reason, Multiple choice questions

I hope you will enjoy this test

General Instructions

Your test contains multiple-choice questions with only one answer type of questions. There are a total of 20 questions
This is a 45 min test. Please make sure you complete it in the stipulated time
You can finish this test any time using the 'Submit' button.

1. When n-p-n transistor is used as an amplifier ,then

Holes more from emitter to base

Electrons move from base to collector

Holes move from base to emitter

Electrons moves from collector to base

2. The forbidden energy band gaps in conductors, semiconductors, and insulators are x, y, and z respectively. The relation among them is

x = y = z

x < y < z

x > y > z

x < y > z

3. Zener diode is used for

Amplification

Rectification

Stabilization

Producing oscillations in an oscillator

4. At absolute zero temperature, a semi-conductor acts as a/an

Conductor

Insulator

Dielectric

None of these

5. Which of the following logic gates is a universal gate?

NOT

AND

NAND

6. The output of OR gate is 1

if both inputs are zero

if either or both inputs are 1

if either input is zero

7. The output of AND gate is 1

if both inputs are zero

if either or both inputs are 1

only if both inputs are 1

if either input is zero

8. Drift current in a p-n junction is due to

Electric field

Charge carriers density

Collisions of electrons

None of these

9. if a small amount of antimony is added to the germanium crystal

it becomes a p-type semiconductor

the antimony becomes an acceptor atom

There will be more free electrons than holes in a semi-conductor

its resistance is increased

10. The following diagram performs the logic function of

AND

NAND

XOR

11. You are required to choose the correct one out of the given five responses and mark it as

(a) If both assertion and reason are true and reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not correct explanation of the assertion.

(c) If assertion is true, but reason is false.

(d) If both assertion and reason are false.

(e) If reason is true but assertion is false

Assertion: A transistor amplifier in common emitter configuration has a low input impedance.

Reason: The base to emitter region is forward biased

12. You are required to choose the correct one out of the given five responses and mark it as

(a) If both assertion and reason are true and reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not correct explanation of the assertion.

(c) If assertion is true, but reason is false.

(d) If both assertion and reason are false.

(e) If reason is true but assertion is false

Assertion: Insulators do not allow flow of current through themselves.

Reason: They have no free charge carriers.

13. You are required to choose the correct one out of the given five responses and mark it as

(a) If both assertion and reason are true and reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not correct explanation of the assertion.

(c) If assertion is true, but reason is false.

(d) If both assertion and reason are false.

(e) If reason is true but assertion is false

Assertion: A pure semiconductor has a negative temperature coefficient of resistance.

Reason: On raising the temperature, more charge carriers are released, conductance increases and resistance decreases.

14. You are required to choose the correct one out of the given five responses and mark it as

(a) If both assertion and reason are true and reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not correct explanation of the assertion.

(c) If assertion is true, but reason is false.

(d) If both assertion and reason are false.

(e) If reason is true but assertion is false

Assertion: NAND is a universal gate.

Reason: It can be used to describe all other logic gates.

15. A forward biased diode is

16. The circuit as shown in figure, the equivalent gate is

NOR gate

OR gate

AND gate

NAND gate

17. The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature

increase exponentially with increasing band gap

decrease exponentially with increasing band gap

decreases with increasing temperature

is independent of the temperature and the band gap.

18. The manifestation of band structure in solids is due to

Heisenberg's uncertainty principle

Pauli's exclusion principle

Bohr's correspondence principle

Boltzmann's law

19. If collector current is 120 mA and base current is 2 mA and resistance gain is 3, what is power gain?

180

10800

1.8

20. The gate for which output is high if at least one input is low

AND

NOR

NAND

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