Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Chapter: 301
Q201:
A frequency counter ______________
A. Counts pulse width
B. Counts no. of clock pulses in 1 second
C. Counts high and low range of given clock pulse
D. None of given options
Correct Answer:
B
Chapter: 407
Q202:
The storage cell in SRAM is
A. a flip –flop
B. a capacitor
C. a fuse
D. a magnetic domain
Correct Answer:
B
Chapter: 0
Q203:
What is the difference between a D latch and a D flip-flop?
A. The D latch has a clock input.
B. The D flip-flop has an enable input.
C. The D latch is used for faster operation.
D. The D flip-flop has a clock input.
Correct Answer:
D
Chapter: 0
Q204:
For a positive edge-triggered J-K flip-flop with both J and K HIGH, the outputs will______ if the clock goes HIGH.
A. toggle
B. set
C. reset
D. not change
Correct Answer:
A
Chapter: 270
Q205:
The OR gate performs Boolean ___________.
A. multiplication
B. subtraction
C. division
D. addition
Correct Answer:
D
Chapter: 290
Q206:
Which circuit is used to perform an addition operation in a digital system?
A. Counter
B. Comparator
C. Adder
D. Decoder
Correct Answer:
C
Chapter: 305
Q207:
The two main types of flip-flops are
A. D flip-flop and JK flip-flop
B. SR flip-flop and JK flip-flop
C. D flip-flop and SR flip-flop
D. SR flip-flop and T flip-flop
Correct Answer:
B
Chapter: 325
Q208:
Which of the following is NOT a synchronous counter?
A. Binary counter
B. Ripple counter
C. Up/Down counter
D. Decade counter
Correct Answer:
B
Chapter: 340
Q209:
In a sequential circuit, the next state depends on __________.
A. Present state only
B. Present state and input
C. Input only
D. Clock pulse only
Correct Answer:
B
Chapter: 350
Q210:
The control word for a data register is used to specify the ___________.
A. Data to be stored
B. Address of the data register
C. Operation to be performed on data
D. Reset status of the data register
Correct Answer:
C
Chapter: 370
Q211:
Which of the following is NOT a combinational logic circuit?
A. Adder
B. Multiplexer
C. Register
D. Encoder
Correct Answer:
C
Chapter: 53
Q212:
The output of an XNOR gate is 1 when ____________
A. I Only
B. IV Only
C. I and IV only
D. II and III only
Correct Answer:
C
Chapter: 5
Q213:
NAND gate is formed by connecting _________
A. AND Gate and then NOT Gate
B. NOT Gate and then AND Gate
C. AND Gate and then OR Gate
D. OR Gate and then AND Gate
Correct Answer:
A
Chapter: 5
Q214:
Which gate can be used to implement an OR gate using NAND gates?
A. NOR Gate
B. XOR Gate
C. AND Gate
D. Combination of NAND Gates
Correct Answer:
D
Chapter: 5
Q215:
What is the output of a 2-input NOR gate when both inputs are 1?
A. zero
B. 1
C. 10
D. 1
Correct Answer:
A
Chapter: 5
Q216:
How is the NOT function represented using a NAND gate?
A. Connecting both inputs together
B. Connecting both inputs separately
C. Using additional OR gates
D. Connecting additional NOT gates
Correct Answer:
A
Chapter: 5
Q217:
What is the symbolic representation of a NAND gate?
A. A circle
B. A triangle
C. A rectangle
D. A bubble at the output
Correct Answer:
D
Chapter: 5
Q218:
How is the expression for a 2-input OR gate written?
A. A . B
B. A + B
C. A - B
D. A / B
Correct Answer:
B
Chapter: 5
Q219:
What is the purpose of timing diagrams in digital logic?
A. To describe the logical operations
B. To show the performance of logic gates over time
C. To represent circuit symbols
D. To illustrate binary number systems
Correct Answer:
B
Chapter: 5
Q220:
In which situation does an AND gate output 0?
A. When all inputs are 1
B. When all inputs are 0
C. When any input is 0
D. When any input is 1
Correct Answer:
C