# Digital Electronics MSQ

## 10 Questions MCQ Test Topic wise Tests for IIT JAM Physics | Digital Electronics MSQ

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Attempt Digital Electronics MSQ | 10 questions in 45 minutes | Mock test for IIT JAM preparation | Free important questions MCQ to study Topic wise Tests for IIT JAM Physics for IIT JAM Exam | Download free PDF with solutions
*Multiple options can be correct
QUESTION: 1

### Most demultiplexers facilitate which type of conversion?

Solution:

A demultiplexer sends a single input to multiple outputs, depending on the select lines. Demultiplexer converts single input into multiple outputs.

*Multiple options can be correct
QUESTION: 2

### Which of the following sets of values given below satisfy the Boolean relation Solution:

The realization of the algebraic expression in terms of logic gate is Truth table. Hence, (a), (c), (d)
The correct answers are: P = 0, Q = 0, R = 0, P = 1, Q = 0, R = 1, P = 1, Q = 1, R = 0

*Multiple options can be correct
QUESTION: 3

### The circuit shown in the figure can be used as : Solution: Hence, it is an integrator and a low-pass filter.
The correct answers are: Integrator, Low-pass filter

*Multiple options can be correct
QUESTION: 4

A pulse is applied to each input of an exclusive OR gate. One pulse goes HIGH at t = 0 and goes back LOW at t = 1 ms. The other pulse goes HIGH at = 0.8 ms and goes back LOW at t = 3 ms. The output pulse can be described as follows :

Solution:

Output is HIGH when only one of the input is high.
The correct answers are: It goes HIGH at t = 0 and back LOW at t = 0.8 ms, It goes HIGH at t = 1 ms and back LOW at t = 3 ms

*Multiple options can be correct
QUESTION: 5

If the output of a logic gate is 0 only when all its inputs are at logic 1, then which of the following are/is not the corresponding gate?

Solution:

Truth table is, This is truth table for NAND gate.

The gate whose output is low if and only if all inputs are high, is NAND.

The logic NAND gate is a combination of a digital logic AND gate and a NOT gate connected together in series.

A NAND gate (NOT-AND) is a logic gate which produces an output which is false only if all its inputs are true; thus its output is complement to that of an AND gate. A LOW (0) output results only if all the inputs to the gate are HIGH (1); if any input is LOW (0), a HIGH (1) output results.

*Multiple options can be correct
QUESTION: 6

The following circuit does not performs the operation of. Solution:

If either V1 or V2 is high, we get a high in output, hence it each like an OR gate.
The correct answers are: NAND gate for a negative logic system, AND gate for a positive logic system, AND gate for a negative logic system

*Multiple options can be correct
QUESTION: 7

Which of the following options is false for a two input XOR gate?

Solution: The truth table for XOR gate is (b), (c), (d).   *Multiple options can be correct
QUESTION: 8

Inputs given to a logic gate are A and B and its output is X. If A = 1, B = 0, then X = 1. What type of gate this could be?

Solution:  clearly it follows OR gate.  Thus, it also follows NAND gate it is an AND gate it is not a NOR gate.
Therefore, the correct options are (b, c)
The correct answers are: NAND, OR

QUESTION: 9

The diagram of a logic circuit is given below. Which of the following represents the output F? Solution:

The gates (a) and (b) are  OR gates whereas c is an  AND gate. The boolean symbols for OR and AND gates are (+) and  (.) respectively.

Thus according to the logic circuit, the output of logic gates (a) and (b) will be  (W+X)  and  (W+Y)  respectively.

Now   F=(W+X). (W+Y)

⟹F=W+(X.Y)                  (using Boolean algebra)

*Multiple options can be correct
QUESTION: 10

A pulse is applied to each input of a 2 input NAND gate, one pulse goes high at t = 0 and goes back LOW at t = 1 ms. The other pulse goes high at f = 0.8 ms and goes Mark 0.00 out of 2.00 back LOW at t = 3 ms. The output pulse.

Solution:

A NAND gate is given by Truth table is. It is low when both input signals are high otherwise it goes high.
The correct answers are: goes low at t = 0.8 ms, comes back high at t = 1 ms Use Code STAYHOME200 and get INR 200 additional OFF Use Coupon Code