Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Chapter: 9
Q301:
What is the canonical form of the Boolean expression A.B + B.C?
A. (A.B.C) + (A.B.C)
B. A.B.C + A.B.C
C. A + B + C
D. A.B.C + A.B.C
Correct Answer:
D
Chapter: 9
Q302:
How is a non-standard SOP expression converted into a standard SOP form?
A. Using Karnaugh maps
B. Applying Boolean laws
C. Using truth tables
D. By adding missing variables
Correct Answer:
B
Chapter: 9
Q303:
Which Boolean law is applied to simplify A + A.B?
A. Distributive Law
B. Complement Law
C. Absorption Law
D. Demorgan's Theorem
Correct Answer:
C
Chapter: 9
Q304:
In the expression (A + B + C), what is the value of F when A=0, B=1, C=1?
A. zero
B. 1
C. Undefined
D. 0.5
Correct Answer:
B
Chapter: 9
Q305:
How do you represent the Boolean expression F = (A + B + C) in a truth table?
A. By marking outputs as 1 for each sum term
B. By marking outputs as 0 for each product term
C. By using Karnaugh maps
D. By applying Demorgan’s theorem
Correct Answer:
A
Chapter: 9
Q306:
What is the result of the Boolean expression (A + B + C)(A + B + D) when A=0, B=1, C=0, D=1?
A. zero
B. 1
C. Undefined
D. 0.5
Correct Answer:
A
Chapter: 9
Q307:
What is the purpose of converting a Boolean expression to its canonical form?
A. To simplify the expression
B. To create a function table
C. To implement the logic circuit
D. To verify correctness
Correct Answer:
C
Chapter: 10
Q308:
What does a Karnaugh Map help to simplify in Boolean algebra?
A. Logic gates
B. Boolean expressions
C. Arithmetic operations
D. Digital circuits
Correct Answer:
B
Chapter: 10
Q309:
How many cells are there in a 3-variable Karnaugh Map?
A. 4
B. 8
C. 16
D. 32
Correct Answer:
B
Chapter: 10
Q310:
In the column-based 3-variable Karnaugh Map, what do the binary values 00, 01, 11, and 10 represent?
A. Values of variable C
B. Values of variable A and B
C. Values of variable B and C
D. Values of variable A, B, and C
Correct Answer:
B
Chapter: 10
Q311:
In a 4-variable Karnaugh Map, how many cells are there?
A. 4
B. 8
C. 16
D. 32
Correct Answer:
C
Chapter: 10
Q312:
What is the maximum number of cells that can be grouped together in a Karnaugh Map?
A. 2
B. 4
C. 8
D. 16
Correct Answer:
D
Chapter: 10
Q313:
The propagation delay of a logic gate refers to ________.
A. The time it takes for the output to change after the input changes
B. The time it takes for the input to change after the output changes
C. The time it takes for the input to be applied to the gate
D. The time it takes for the gate to be set
Correct Answer:
A
Chapter: 10
Q314:
In the Karnaugh Map, what should be the size of the group formed for simplification?
A. Any size
B. Size of 1
C. Size of 2 or any power of 2
D. Size of 3
Correct Answer:
C
Chapter: 10
Q315:
What does each cell in a Karnaugh Map represent?
A. Variable name
B. Minterm or Maxterm
C. Arithmetic value
D. Boolean operation
Correct Answer:
B
Chapter: 10
Q316:
How are don’t care conditions represented in a Karnaugh Map?
A. By 0s
B. By 1s
C. By x
D. By blank cells
Correct Answer:
C
Chapter: 10
Q317:
What is the purpose of grouping cells in a Karnaugh Map?
A. To maximize the number of cells
B. To minimize the number of groups
C. To simplify the Boolean expression
D. To add new variables
Correct Answer:
C
Chapter: 10
Q318:
For a 3-variable Karnaugh Map, what product term does a single cell group represent?
A. Product term of 2 variables
B. Product term of 1 variable
C. Product term of 3 variables
D. Group term of 4 variables
Correct Answer:
B
Chapter: 10
Q319:
What does a group of 4 cells in a 4-variable Karnaugh Map represent?
A. Product term of 1 variable
B. Product term of 2 variables
C. Product term of 3 variables
D. Product term of 4 variables
Correct Answer:
B
Chapter: 10
Q320:
How are non-standard SOP expressions handled in Karnaugh Maps?
A. They are always converted into standard form
B. They are ignored
C. They can be mapped directly
D. They are simplified automatically
Correct Answer:
C