NEET Physics Semiconductor Electronics MCQs Set A

a) number density of carries increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density

b) both number density of carries and relaxation time increase

c) relaxation time increases

d) number density of free current carries increases

Answer: number density of carries increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density

Question:

a) 3 corresponds to forward bias of junction and 1 corresponds to reverse bias of junctions

b) 1 and 3 both correspond to forward bias of junction

c) 1 corresponds to forward bias and 3 corresponds to reverse bias of junction

d) 3 and 1 both correspond to reverse bias of junction

Answer:  3 corresponds to forward bias of junction and 1 corresponds to reverse bias of junctions

Question:

a)

b) 0 V

c) 110 V

d) 220 V

Answer:

Question: Hole in semiconductor is

a) a vacancy created when an electron leaves a covalent bond

b) absence of free electrons

c) an artificially created particle

d) an anti – particle of electron

Answer: a vacancy created when an electron leaves a covalent bond

Question:

a) would be like a half wave rectifier with negative cycles in output

b) would be like that of a full wave rectifier

c) would be like a half wave rectifier with positive cycles in output

d) would be zero at all times

Answer:  would be like a half wave rectifier with negative cycles in output

Question:  In the circuit shown in figure given below, if the diode forward voltage drop is 0.3 V, the voltage difference between A and B is

a) 2.3 V

b) 0.5 V

c) 1.3 V

d) 0

Answer: 2.3 V

Question:  The barrier potential of a p-n junction depends on:
(A) type of semi conductor material
(B) amount of doping
(C) temperature
Which one of the following is correct ?

a) (A), (B) and (C)

b) (B) only

c) (B) and (C) only

d) (A) and (B) only

Answer:  (A), (B) and (C)

Question:  An oscillator is nothing but an amplifier with

a) positive feedback

b) large gain

c) negative feedback

d) no feedback

Answer:  positive feedback

Question:  Following diagram performs the logic function of

a) AND gate

b) OR gate

c) XOR gate

d) NAND gate

Answer:  AND gate

More Questions..................................... 

Question:   To get output 1 for the following circuit, the correct choice for the input is

a) A = 1, B = 0, C = 1

b) A = 1, B = 0, C = 0

c) A = 0, B = 1, C = 0

d) A = 1, B = 1, C = 0

Answer:  A = 1, B = 0, C = 1

Question: Assertion : A transistor amplifier in common emitter configuration has a low input impedence.
Reason : The base to emitter region is forward biased

a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion

c) If Assertion is correct but Reason is incorrect.

d) If both the Assertion and Reason are incorrect.

Answer: If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

Question: The temperature dependence of resistances of Cu and undoped Si in the temperature range 300-400 K, is best described by

a) Linear increase for Cu, exponential decrease of Si.

b) Linear decrease for Cu, linear decrease for Si.

c) Linear increase for Cu, linear increase for Si.

d) Linear increase for Cu, exponential increase for Si.

Answer:  Linear increase for Cu, exponential decrease of Si.

Question:   If a, b, c, d are inputs to a gate and x is its output, then, as per the following time graph, the gate is

a) OR

b) NAND

c) NOT

d) AND

Answer: OR

Question:  The given electrical network is equivalent to

a) NOR gate

b) AND gate

c) NOT gate

d) OR gate

Answer:  NOR gate

Question:

a) 150 and 15000

b) 200 and 1000

c) 20 and 2000

d) 15 and 200

Answer:  150 and 15000