Digital Circuits Questions and Answers – Boolean Logic Operations

This set of Digital Electronics/Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Boolean Logic Operations”.

1. In boolean algebra, the OR operation is performed by which properties?
a) Associative properties
b) Commutative properties
c) Distributive properties
d) All of the Mentioned

2. The expression for Absorption law is given by _________
a) A + AB = A
b) A + AB = B
c) AB + AA’ = A
d) A + B = B + A

3. According to boolean law: A + 1 = ?
a) 1
b) A
c) 0
d) A’

4. The involution of A is equal to _________
a) A
b) A’
c) 1
d) 0

5. A(A + B) = ?
a) AB
b) 1
c) (1 + AB)
d) A

6. DeMorgan’s theorem states that _________
a) (AB)’ = A’ + B’
b) (A + B)’ = A’ * B
c) A’ + B’ = A’B’
d) (AB)’ = A’ + B

7. (A + B)(A’ * B’) = ?
a) 1
b) 0
c) AB
d) AB’

8. Complement of the expression A’B + CD’ is _________
a) (A’ + B)(C’ + D)
b) (A + B’)(C’ + D)
c) (A’ + B)(C’ + D)
d) (A + B’)(C + D’)

9. Simplify Y = AB’ + (A’ + B)C.
a) AB’ + C
b) AB + AC
c) A’B + AC’
d) AB + A

10. The boolean function A + BC is a reduced form of ____________
a) AB + BC
b) (A + B)(A + C)
c) A’B + AB’C
d) (A + C)B

Answer: b
Explanation: (A + B)(A + C) = AA + AC + AB + BC = A + AC + AB + BC (By Commutative Property) = A(1 + C + B) + BC = A + BC (1 + B + C =1 By 1’s Property).

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