Electronic Devices | Physics JEE previous year questions with Solutions

Q 1 :

ldentify the logic gate given in the circuit [2024]

NOR gate
NAND gate
OR gate
AND gate

1

2

3

4

(3)

Y = A + B, Hence OR gate

Q 2 :

Following gates section is connected in a complete suitable circuit.

For which of the following combination, bulb will glow (ON) [2024]

A = 0, B = 0, C = 0, D = 1
A = 1, B = 1, C = 1, D = 0
A = 1, B = 0, C = 0, D = 0
A = 0, B = 1, C = 1, D = 1

1

2

3

4

(3)

Bulb is only on when across the bulb, signals are opposite → 0,1 or 1,0

A → Signals are 0 and 0

B → Signals are 1 and 1

C → Signals are 0 and 1

D → Signals are 0 and 0

So, the bulb is on only in option C.

Q 3 :

The output (Y) of logic circuit given below is 0 only when [2024]

A = 1, B = 0
A = 0, B = 0
A = 0, B = 1
A = 1, B = 1

1

2

3

4

(2)

Q 4 :

The correct truth table for the following logic circuit is: [2024]

A B Y

0 0 1

0 1 1

1 0 0

1 1 0
A B Y

0 0 1

0 1 1

1 0 0

1 1 1
A B Y

0 0 0

0 1 0

1 0 0

1 1 1
A B Y

0 0 0

0 1 1

1 0 0

1 1 1

1

2

3

4

(2)

By Boolean expression

$Y = \bar{A} + A . B$

A	B	Y
0	0	1
0	1	1
1	0	0
1	1	1

Q 5 :

The output Y of following circuit for given inputs is [2024]

$A . B (A + B)$
$A . B$
$0$
$\bar{A} \cdot B$

1

2

3

4

(3)

$Y = \bar{A} \cdot B \cdot (A + \bar{B})$

$= \bar{A} \cdot B \cdot A + \bar{A} \cdot B \cdot \bar{B}$

$= \bar{A} \cdot A \cdot B + \bar{A} \cdot B \cdot \bar{B}$

$= 0 + 0 = 0$

Q 6 :

In the truth table of the above circuit, the values of X and Y are [2024]

1, 1
1, 0
0, 1
0, 0

1

2

3

4

(1)

For $x$

For $y$

Q 7 :

The truth table of the given circuit diagram is : [2024]

A B Y

0 0 1

0 1 0

1 0 0

1 1 1
A B Y

0 0 0

0 1 1

1 0 1

1 1 0
A B Y

0 0 0

0 1 0

1 0 0

1 1 1
A B Y

0 0 1

0 1 1

1 0 1

1 1 0

1

2

3

4

(2)

$Y = A \cdot \bar{B} + \bar{A} \cdot B$

This is XOR gate

Q 8 :

Identify the logic operation performed by the given circuit. [2024]

AND
NOR
NAND
OR

1

2

3

4

(4)

Q 9 :

The truth table for this given circuit is [2024]

A B Y

0 0 1

0 1 1

1 0 1

1 1 0
A B Y

0 0 1

0 1 0

1 0 1

1 1 0
A B Y

0 0 0

0 1 1

1 0 0

1 1 1
A B Y

0 0 0

0 1 0

1 0 0

1 1 1

1

2

3

4

(3)

Q 10 :

The output of the given circuit diagram is [2024]

A B Y

0 0 0

1 0 0

0 1 0

1 1 1
A B Y

0 0 0

1 0 1

0 1 1

1 1 0
A B Y

0 0 0

1 0 0

0 1 0

1 1 0
A B Y

0 0 0

1 0 0

0 1 1

1 1 0

1

2

3

4

(3)

Q 11 :

The output of the circuit is low (zero) for: [2025]

(A) X = 0, Y = 0 (B) X = 0, Y = 1
(C) X = 1, Y = 0 (D) X = 1, Y = 1

Choose the correct answer from the options given below:

(A), (C) and (D) only
(A), (B) and (C) only
(B), (C) and (D) only
(A), (B) and (D) only

1

2

3

4

(3)

X	Y
0	0	1
0	1	0
1	0	0
1	1	0

Q 12 :

Which of the following circuits has the same output as that of the given circuit? [2025]

1

2

3

4

(1)

Q 13 :

For the circuit shown above, equivalent GATE is: [2025]

OR gate
NOT gate
AND gate
NAND gate

1

2

3

4

(1)

A	B	Y
0	0	0
0	1	1
1	0	1
1	1	1

$\Rightarrow$ OR Gate

Q 14 :

The truth table for the circuit given below is: [2025]

A B Y

0 0 0

0 1 1

1 0 1

1 1 0
A B Y

0 0 0

1 0 0

1 1 0

0 1 1
A B Y

0 0 0

1 0 1

0 1 0

1 1 0
A B Y

0 0 0

1 1 1

1 0 1

0 1 1

1

2

3

4

(1)

XOR (Exclusive OR)

Q 15 :

In the digital circuit shown in the figure, for the given inputs the P and Q values are: [2025]

P = 1, Q = 1
P = 0, Q = 0
P = 0, Q = 1
P = 1, Q = 0

1

2

3

4

(2)

Q 16 :

Choose the correct logic circuit for the given truth table having inputs A and B. [2025]

Inputs Output

A B Y

0 0 0

0 1 0

1 0 1

1 1 1

1

2

3

4

(2)

Option 2 matches the truth table

Q 17 :

The truth table corresponding to the circuit given below is [2025]

A B C

0 0 0

1 0 0

0 1 0

1 1 1
A B C

0 0 0

0 1 0

1 0 1

1 1 1
A B C

0 0 1

1 0 0

0 1 0

1 1 0
A B C

0 0 1

0 1 0

1 0 0

1 1 0

1

2

3

4

(2)

A	B	A + B	C
0	0	0	0
1	0	1	1
0	1	1	0
1	1	1	1

Q 18 :

The Boolean expression $Y = A \bar{B} C + \bar{A} \bar{C}$ can be realised with which of the following gate configurations. [2025]

A. One 3-input AND gate, 3 NOT gates and one 2-input OR gate, one 2-input AND gate

B. One 3-input AND gate, 1 NOT gate, one 2-input NOR gate and one 2-input OR gate

C. 3-input OR gate, 3 NOT gates and one 2-input AND gate

Choose the correct answer from the options given below:

B, C only
A, B only
A, B, C only
A, C only

1

2

3

4

(2)

Q 19 :

Consider the following logic circuit. [2025]

The output is Y = 0 when:

A = 1 and B = 1
A = 0 and B = 1
A = 1 and B = 0
A = 0 and B = 0

1

2

3

4

(1)

A	B	Y
0	0	1
1	0	1
0	1	1
1	1	0

Q 20 :

The logic gate equivalent to the given circuit diagram is [2023]

NOR
NAND
OR
AND

1

2

3

4

(2)

NAND gate

Q 21 :

For the given logic gates combination, the correct truth table will be [2023]

A B X

0 0 1

0 1 0

1 0 0

1 1 0
A B X

0 0 1

0 1 1

1 0 1

1 1 0
A B X

0 0 1

0 1 0

1 0 1

1 1 0
A B X

0 0 0

0 1 1

1 0 1

1 1 1

1

2

3

4

(2)

Q 22 :

The output waveform of the given logical circuit for the following inputs A and B as shown below is [2023]

1

2

3

4

(4)

Q 23 :

The output Y for the inputs A and B of the circuit is given by

Truth table of the shown circuit is: [2023]

1

2

3

4

(4)

Q 24 :

Name the logic gate equivalent to the diagram attached [2023]

OR
AND
NAND
NOR

1

2

3

4

(4)

Circuit is closed when neither A nor B is closed ⇒ current flows for A = 0 B = 0 when either or both of A & B is closed we get current bypass from switch

Hence it is “NOR” gate

Q 25 :

For the logic circuit shown, the output waveform at Y is ________ [2023]

1

2

3

4

(1)

A	B	Y
0	0	0
0	1	1
1	0	1
1	1	1

According to truth table, resultant graph is

Q 26 :

The logic performed by the circuit shown in figure is equivalent to [2023]

AND
NAND
OR
NOR

1

2

3

4

(1)

The truth table for the given circuit will be:

a	b	output
0	0	0
0	1	0
1	0	0
1	1	1

Hence it will be equivalent to AND gate.

Q 27 :

The logic operations performed by the given digital circuit is equivalent to [2023]

AND
NOR
OR
NAND

1

2

3

4

(1)

Q 28 :

For the following circuit and given inputs A and B, choose the correct option for output ‘Y’ [2023]

1

2

3

4

(4)

Q 29 :

The output from a NAND gate having inputs A and B given below will be. [2023]

1

2

3

4

(1)

Truth table for NAND gate is

A	B	$Y = \bar{A \cdot B}$
0	0	1
0	1	1
1	0	1
1	1	0

On the basis of given input A and B the truth table is

A	B	Y
1	1	0
0	0	1
0	1	1
1	0	1
1	1	0
0	0	1
0	1	1

So the correct answer is Option 1.

Q 30 :

The given circuit works as : [2026]

NOR gate
OR gate
AND gate
NAND gate

1

2

3

4

(4)

Topic Question Set

Q 1 :

ldentify the logic gate given in the circuit [2024]

Q 2 :

Following gates section is connected in a complete suitable circuit.

For which of the following combination, bulb will glow (ON) [2024]

Q 3 :

The output (Y) of logic circuit given below is 0 only when [2024]

Q 4 :

The correct truth table for the following logic circuit is: [2024]

Q 5 :

The output Y of following circuit for given inputs is [2024]

Q 6 :

In the truth table of the above circuit, the values of X and Y are [2024]

Q 7 :

The truth table of the given circuit diagram is : [2024]

Q 8 :

Identify the logic operation performed by the given circuit. [2024]

Q 9 :

The truth table for this given circuit is [2024]

Q 10 :

The output of the given circuit diagram is [2024]

Q 11 :

The output of the circuit is low (zero) for: [2025]

(A) X = 0, Y = 0 (B) X = 0, Y = 1
(C) X = 1, Y = 0 (D) X = 1, Y = 1

Choose the correct answer from the options given below:

Q 12 :

Which of the following circuits has the same output as that of the given circuit? [2025]

Q 13 :

For the circuit shown above, equivalent GATE is: [2025]

Q 14 :

The truth table for the circuit given below is: [2025]

Q 15 :

In the digital circuit shown in the figure, for the given inputs the P and Q values are: [2025]

Q 16 :

Choose the correct logic circuit for the given truth table having inputs A and B. [2025]

Inputs Output

A B Y

0 0 0

0 1 0

1 0 1

1 1 1

Q 17 :

The truth table corresponding to the circuit given below is [2025]

Q 19 :

Consider the following logic circuit. [2025]

The output is Y = 0 when:

Q 20 :

The logic gate equivalent to the given circuit diagram is [2023]

Q 21 :

For the given logic gates combination, the correct truth table will be [2023]

Q 22 :

The output waveform of the given logical circuit for the following inputs A and B as shown below is [2023]

Q 23 :

The output Y for the inputs A and B of the circuit is given by

Truth table of the shown circuit is: [2023]

Q 24 :

Name the logic gate equivalent to the diagram attached [2023]

Q 25 :

For the logic circuit shown, the output waveform at Y is ________ [2023]

Q 26 :

The logic performed by the circuit shown in figure is equivalent to [2023]

Q 27 :

The logic operations performed by the given digital circuit is equivalent to [2023]

Q 28 :

For the following circuit and given inputs A and B, choose the correct option for output ‘Y’ [2023]

Q 29 :

The output from a NAND gate having inputs A and B given below will be. [2023]

Q 30 :

The given circuit works as : [2026]

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Topic Question Set

Q 1 : ldentify the logic gate given in the circuit [2024]

Q 2 : Following gates section is connected in a complete suitable circuit. For which of the following combination, bulb will glow (ON) [2024]

Q 3 : The output (Y) of logic circuit given below is 0 only when [2024]

Q 4 : The correct truth table for the following logic circuit is: [2024]

Q 5 : The output Y of following circuit for given inputs is [2024]

Q 6 : In the truth table of the above circuit, the values of X and Y are [2024]

Q 7 : The truth table of the given circuit diagram is : [2024]

Q 8 : Identify the logic operation performed by the given circuit. [2024]

Q 9 : The truth table for this given circuit is [2024]

Q 10 : The output of the given circuit diagram is [2024]

Q 11 : The output of the circuit is low (zero) for: [2025] (A) X = 0, Y = 0 (B) X = 0, Y = 1 (C) X = 1, Y = 0 (D) X = 1, Y = 1 Choose the correct answer from the options given below:

Q 12 : Which of the following circuits has the same output as that of the given circuit? [2025]

Q 13 : For the circuit shown above, equivalent GATE is: [2025]

Q 14 : The truth table for the circuit given below is: [2025]

Q 15 : In the digital circuit shown in the figure, for the given inputs the P and Q values are: [2025]

Q 16 : Choose the correct logic circuit for the given truth table having inputs A and B. [2025] Inputs Output A B Y 0 0 0 0 1 0 1 0 1 1 1 1

Q 17 : The truth table corresponding to the circuit given below is [2025]

Q 19 : Consider the following logic circuit. [2025] The output is Y = 0 when:

Q 20 : The logic gate equivalent to the given circuit diagram is [2023]

Q 21 : For the given logic gates combination, the correct truth table will be [2023]

Q 22 : The output waveform of the given logical circuit for the following inputs A and B as shown below is [2023]

Q 23 : The output Y for the inputs A and B of the circuit is given by Truth table of the shown circuit is: [2023]

Q 24 : Name the logic gate equivalent to the diagram attached [2023]

Q 25 : For the logic circuit shown, the output waveform at Y is ________ [2023]

Q 26 : The logic performed by the circuit shown in figure is equivalent to [2023]

Q 27 : The logic operations performed by the given digital circuit is equivalent to [2023]

Q 28 : For the following circuit and given inputs A and B, choose the correct option for output ‘Y’ [2023]

Q 29 : The output from a NAND gate having inputs A and B given below will be. [2023]

Q 30 : The given circuit works as : [2026]

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Q 1 :

ldentify the logic gate given in the circuit [2024]

Q 2 :

Following gates section is connected in a complete suitable circuit.

For which of the following combination, bulb will glow (ON) [2024]

Q 3 :

The output (Y) of logic circuit given below is 0 only when [2024]

Q 4 :

The correct truth table for the following logic circuit is: [2024]

Q 5 :

The output Y of following circuit for given inputs is [2024]

Q 6 :

In the truth table of the above circuit, the values of X and Y are [2024]

Q 7 :

The truth table of the given circuit diagram is : [2024]

Q 8 :

Identify the logic operation performed by the given circuit. [2024]

Q 9 :

The truth table for this given circuit is [2024]

Q 10 :

The output of the given circuit diagram is [2024]

Q 11 :

The output of the circuit is low (zero) for: [2025]

(A) X = 0, Y = 0 (B) X = 0, Y = 1
(C) X = 1, Y = 0 (D) X = 1, Y = 1

Choose the correct answer from the options given below:

Q 12 :

Which of the following circuits has the same output as that of the given circuit? [2025]

Q 13 :

For the circuit shown above, equivalent GATE is: [2025]

Q 14 :

The truth table for the circuit given below is: [2025]

Q 15 :

In the digital circuit shown in the figure, for the given inputs the P and Q values are: [2025]

Q 16 :

Choose the correct logic circuit for the given truth table having inputs A and B. [2025]

Inputs Output

A B Y

0 0 0

0 1 0

1 0 1

1 1 1

Q 17 :

The truth table corresponding to the circuit given below is [2025]

Q 19 :

Consider the following logic circuit. [2025]

The output is Y = 0 when:

Q 20 :

The logic gate equivalent to the given circuit diagram is [2023]

Q 21 :

For the given logic gates combination, the correct truth table will be [2023]

Q 22 :

The output waveform of the given logical circuit for the following inputs A and B as shown below is [2023]

Q 23 :

The output Y for the inputs A and B of the circuit is given by

Truth table of the shown circuit is: [2023]

Q 24 :

Name the logic gate equivalent to the diagram attached [2023]

Q 25 :

For the logic circuit shown, the output waveform at Y is ________ [2023]

Q 26 :

The logic performed by the circuit shown in figure is equivalent to [2023]

Q 27 :

The logic operations performed by the given digital circuit is equivalent to [2023]

Q 28 :

For the following circuit and given inputs A and B, choose the correct option for output ‘Y’ [2023]

Q 29 :

The output from a NAND gate having inputs A and B given below will be. [2023]

Q 30 :

The given circuit works as : [2026]