Electronic Devices — DPP 3

20 NEET questions from Electronic Devices, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
Forbidden energy gap of Ge is 0.75 eV, maximum wave length of incident radiation of photon for producing electron - hole pair in germanium semiconductor is :-
  1. A $4200 \AA$
  2. B $16500 \AA$
  3. C $4700 \AA$
  4. D $4000 \AA$
Show answer & explanation

Correct answer: B

Electronic Devices – NEET-13979
2
The logic symbols shown here are logically equivalent to :-
Electronic Devices – NEET-14038
  1. A (a) AND and (b) OR gate
  2. B (a) NOR and (b) NAND gate
  3. C (a) OR and (b) AND gate
  4. D (a) NAND and (b) NOR gate
Show answer

Correct answer: D

3
The truth table shown below is for which of the following gates :-
Electronic Devices – NEET-14027
  1. A XNOR
  2. B AND
  3. C XOR
  4. D NOR
Show answer

Correct answer: A

4
In Boolean algebra, which of the following is not equal to zero :-
  1. A $A . \bar { A }$
  2. B A. 0
  3. C $\overline { \mathrm { A } + \overline { \mathrm { A } } }$
  4. D $\overline { \mathrm { A } } .0$
Show answer

Correct answer: D

5
A full wave rectifier circuit along with the input and output voltage is shown in the figure then output due to diode D$_{2}$ is :-
Electronic Devices – NEET-13981
  1. A A, C
  2. B B, D
  3. C B, C
  4. D A, D
Show answer

Correct answer: B

6
The output of the given logic gate is 1 when inputs A, B, and C are such that :-
Electronic Devices – NEET-13987
  1. A A = 1, B = 0, C = 1
  2. B A = 1, B = 1, C = 0
  3. C A = B = C = 0
  4. D A = B = C = 1
Show answer

Correct answer: D

7
Zener dode is used for :-
  1. A rectification
  2. B stabilization
  3. C amplification
  4. D producing oscillations in an oscillator
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Correct answer: B

8
Which of the following Boolean expression is not correct :-
  1. A $\overline { \overline { \mathrm { A } } } \cdot \overline { \mathrm { B } } = \mathrm { A } + \mathrm { B }$
  2. B $\overline { \overline { \mathrm { A } } + \overline { \mathrm { B } } } = \mathrm { A } \cdot \mathrm { B }$
  3. C $\mathrm { A } \cdot \mathrm { B } = \mathrm { A } \cdot \mathrm { B }$
  4. D $\overline { 1 } + \overline { 1 } = 1$
Show answer

Correct answer: D

9
The output of a two input NOR gate is in state 1 when :-
  1. A either input terminals is at 0 state
  2. B either input terminals is at 1 state
  3. C both input terminals are at 0 state
  4. D both input terminals are at 1 state
Show answer

Correct answer: C

10
A two inputed XOR gate produces an high output only when its both inputs are :-
  1. A same
  2. B different
  3. C low
  4. D high
Show answer

Correct answer: B

11
The electrical circuit used to get smooth DC output from a rectifier circuit is called :-
  1. A filter
  2. B oscillator
  3. C logic gate
  4. D amplifier
Show answer

Correct answer: A

12
The output Y of the combination of gates shown is equal to :-
Electronic Devices – NEET-14032
  1. A A
  2. B $\bar { A }$
  3. C A + B
  4. D AB
Show answer & explanation

Correct answer: A

Electronic Devices – NEET-14032 Y = A.(A+B)
Y = A.A + AB
Y = A + AB = A(1 + B)
Y = A
13
Digital circuits can be made by respectative use of :-
  1. A OR gate
  2. B AND gate
  3. C NOT gate
  4. D NAND gate
Show answer

Correct answer: D

14
In p-n junction photocell electromotive force due to monochromatic light is proportional to
  1. A p-n potential barrier
  2. B intensity of light
  3. C frequency of light
  4. D p-n applied voltage
Show answer

Correct answer: B

15
To get an output 1, the input ABC should be :-
Electronic Devices – NEET-14034
  1. A 101
  2. B 100
  3. C 110
  4. D 010
Show answer

Correct answer: A

16
Current I in the circuit will be :-
Electronic Devices – NEET-13970
  1. A $\frac { 5 } { 40 } \mathrm {~A}$
  2. B $\frac { 5 } { 50 } \mathrm {~A}$
  3. C $\frac { 5 } { 10 } \mathrm {~A}$
  4. D $\frac { 5 } { 20 } \mathrm {~A}$
Show answer & explanation

Correct answer: B

Electronic Devices – NEET-13970
17
A NAND gate followed by a NOT gate is :-
  1. A an OR gate
  2. B an AND gate
  3. C a NOR gate
  4. D a XOR gate
Show answer

Correct answer: B

18
The combination of the gates shown will produce
Electronic Devices – NEET-14040
  1. A AND gate
  2. B NAND gate
  3. C NOR gate
  4. D XOR gate
Show answer & explanation

Correct answer: D

Electronic Devices – NEET-14040
19
The output of 2 input gate is 1 only if its inputs are equal. It is true for :-
  1. A NAND
  2. B AND
  3. C EX-NOR
  4. D EX-OR
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Correct answer: C

20
Efficiency of a half wave rectifier is nearly :-
  1. A 80%
  2. B 60%
  3. C 40%
  4. D 20%
Show answer

Correct answer: C

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