Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Chapter: 5
Q221:
Which gate has the function of a logical addition operation?
A. AND Gate
B. OR Gate
C. NOT Gate
D. NAND Gate
Correct Answer:
B
Chapter: 5
Q222:
What is the expression for a NOT gate?
A. F = A
B. F = A + B
C. F = A . B
D. F = A / B
Correct Answer:
A
Chapter: 5
Q223:
How can an AND gate be implemented using NAND gates?
A. Using a single NAND gate
B. Using two NAND gates
C. Using three NAND gates
D. Using four NAND gates
Correct Answer:
B
Chapter: 5
Q224:
What does the output of a NOR gate represent when all inputs are 0?
A. zero
B. 1
C. 10
D. 1
Correct Answer:
B
Chapter: 5
Q225:
Which gate is used in car door alarm systems to detect if any door is open?
A. AND Gate
B. OR Gate
C. NOT Gate
D. NAND Gate
Correct Answer:
B
Chapter: 5
Q226:
What is the role of the enable/disable signal in a counter device using an AND gate?
A. To count continuously
B. To stop counting
C. To reset the counter
D. To start the counter
Correct Answer:
B
Chapter: 5
Q227:
How many inputs does a typical OR gate have?
A. 1
B. 2
C. 3
D. 4
Correct Answer:
B
Chapter: 5
Q228:
What is the output of a NOT gate when the input is 0?
A. zero
B. 1
C. 10
D. 1
Correct Answer:
B
Chapter: 5
Q229:
Which gate's function table output is 1 when at least one input is 1?
A. AND Gate
B. OR Gate
C. NOT Gate
D. NOR Gate
Correct Answer:
B
Chapter: 5
Q230:
What is the purpose of a bubble in a logic gate symbol?
A. To invert the output
B. To invert the inputs
C. To represent a NOT gate
D. To show a NAND gate
Correct Answer:
C
Chapter: 5
Q231:
How can a NOT gate be implemented using NAND gates?
A. By connecting both inputs together
B. By using a single NAND gate
C. By using an OR gate
D. By using a NOR gate
Correct Answer:
A
Chapter: 5
Q232:
What is the output of a NOR gate when both inputs are 0?
A. zero
B. 1
C. 10
D. 1
Correct Answer:
B
Chapter: 5
Q233:
What is the function of a NAND gate in digital circuits?
A. AND-NOT function
B. OR-NOT function
C. Addition function
D. Subtraction function
Correct Answer:
A
Chapter: 5
Q234:
How is an OR gate implemented using NAND gates?
A. By using one NAND gate
B. By using two NAND gates
C. By using three NAND gates
D. By using four NAND gates
Correct Answer:
C
Chapter: 6
Q235:
Which logic gate can be used as a universal gate?
A. AND Gate
B. OR Gate
C. NOR Gate
D. XOR Gate
Correct Answer:
C
Chapter: 6
Q236:
How can a NOT gate be implemented using a NOR gate?
A. By connecting both inputs of the NOR gate together
B. By connecting one input of the NOR gate to ground
C. By using two separate NOR gates
D. By using a NAND gate with one input connected to the NOR gate
Correct Answer:
A
Chapter: 6
Q237:
What is the output of a NOR gate when both inputs are 1?
A. 1
B. zero
C. Undefined
D. High impedance
Correct Answer:
B
Chapter: 6
Q238:
The output of an XOR gate is zero (0) when __________
A. I Only
B. IV Only
C. I and IV only
D. II and III only
Correct Answer:
C
Chapter: 6
Q239:
How many NOR gates are needed to implement an AND gate?
A. One
B. Two
C. Three
D. Four
Correct Answer:
C
Chapter: 6
Q240:
What is the result of connecting a NOR gate with a NOT gate at its output?
A. It performs the OR function
B. It performs the AND function
C. It performs the NAND function
D. It performs the XOR function
Correct Answer:
A