Logic Gates MCQs

Question 1

Which of the following is not a basic Boolean operation?

Accepted Answer

FOR

Answer

OR

Answer

NOT

Answer

AND

Question 2

Which of the following gates is described by the expression ?X=ABCD?

Accepted Answer

NAND

Answer

OR

Answer

AND

Answer

NOR

Question 3

What is the Boolean expression for a four-input OR gate?

Accepted Answer

Y = A + B + C + D

Answer

Y = A· B · C · D

Answer

Y = A – B – C – D

Answer

Y = A $ B $ C $ D

Question 4

How many entries would a truth table for a four-input NAND gate have?

Accepted Answer

16

Answer

2

Answer

8

Answer

32

Question 5

The Boolean expression for a 3-input OR gate is ________.

Accepted Answer

X = A + B + C

Answer

X = A + B

Answer

X = ABC

Answer

X = A + BC

Question 6

From the truth table for a three-input NOR gate, what is the only condition of inputs A, B, and C that will make the output X high?

Accepted Answer

A = 0, B = 0, C = 0

Answer

A = 1, B = 1, C = 1

Answer

A = 1, B = 0, C = 0

Answer

A = 0, B = 0, C = 1

Question 7

The logic gate that will have a LOW output when any one of its inputs is HIGH is the:

Accepted Answer

AND gate

Answer

NAND gate

Answer

OR gate

Question 8

The output of a NAND gate is LOW if ________.

Accepted Answer

all inputs are HIGH

Answer

all inputs are LOW

Answer

any input is LOW

Answer

any input is HIGH

Question 9

If A is LOW or B is LOW or BOTH are LOW, then X is LOW. If A is HIGH and B is HIGH, then X is HIGH. These rules specify the operation of a(n) ________.

Accepted Answer

AND gate

Answer

OR gate

Answer

NAND gate

Answer

XOR gate