Computer Fundamentals Questions and Answers – Logic Gates

This set of Computer Fundamentals Multiple Choice Questions & Answers (MCQs) focuses on “Logic Gates”.

1. Electronic circuits that operate on one or more input signals to produce standard output _______
a) Series circuits
b) Parallel Circuits
c) Logic Signals
d) Logic Gates
View Answer

Answer: d
Explanation: The logic gates operate on one or more input signals to produce a standard output.
Logic gates give the output in the form of 0 and 1.
The Boolean algebra can be applied to the logic gates.

2. Logic Gates are the building blocks of all circuits in a computer.
a) True
b) False
View Answer

Answer: a
Explanation: The statement is true.
Logic gates are idealized to implement a boolean function in all circuits of a computer.
The signals are directed as per the outputs of the logic gates in the form of 0 and 1.

3. A __________ gate gives the output as 1 only if all the inputs signals are 1.
a) AND
b) OR
c) EXOR
d) NOR
View Answer

Answer: a
Explanation: The AND gate gives a 1 only if all the input signals are 1.
The Boolean expression for evaluating an AND signal is: Y=A.B.
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4. The boolean expression of an OR gate is _______
a) A.B
b) A’B+AB’
c) A+B
d) A’B’
View Answer

Answer: c
Explanation: An OR gate gives the result as 1 if any one of the inputs is one.
Its expression is A+B.
An OR gate gives a 0 only if both the inputs are 0.

5. The gate which is used to reverse the output obtained is _____
a) NOR
b) NAND
c) EXOR
d) NOT
View Answer

Answer: d
Explanation: NOT gate is used to reverse the output from 0 to 1 and vice-versa.
The Boolean expression for NOT gate is Y=A’.
Therefore, it gives the complement of the result obtained.

6. Which of the following gate will give a 0 when both of its inputs are 1?
a) AND
b) OR
c) NAND
d) EXOR
View Answer

Answer: c
Explanation: The NAND gate gives 0 as the output when both of its inputs are 1 or any one of the input is 1.
It returns a 1 only if both the inputs are 0.

7. When logic gates are connected to form a gating/logic network it is called as a ______________ logic circuit.
a) combinational
b) sequential
c) systematic
d) hardwired
View Answer

Answer: a
Explanation: It is referred to as a combinational circuit as it comprises a number of gates.
It is connected to evaluate a result of a Boolean expression.
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8. The universal gate that can be used to implement any Boolean expression is __________
a) NAND
b) EXOR
c) OR
d) AND
View Answer

Answer: a
Explanation: NAND gate can be used to implement any Boolean expression.
It is a universal gate. A universal gate can be used to implement any other Boolean function without using any other logic gate.

9. The gate which is called an inverter is called _________
a) NOR
b) NAND
c) EXOR
d) NOT
View Answer

Answer: d
Explanation: Inverter is used to reverse the output. A NOT gate is used to invert or change the output from 0 to 1 and vice-versa.
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10. The expression of an EXOR gate is ____________
a) A’B+AB’
b) AB+A’B’
c) A+A.B
d) A’+B’
View Answer

Answer: a
Explanation: The expression for an EXOR gate is A’B+AB’.
An EXOR gate is nothing but an exclusive OR gate.

Sanfoundry Global Education & Learning Series – Computer Fundamentals.

To practice all areas of Computer Fundamentals, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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