Digital Logic Design MCQs

Which logic gate is used for addition in digital circuits?

A) AND
B) OR
C) XOR
D) NOT
Answer: C) XOR
What is the basic building block of digital circuits?

A) Transistor
B) Capacitor
C) Inductor
D) Diode
Answer: A) Transistor
Which gate has an output that is the complement of its input?

A) OR
B) NOT
C) XOR
D) NAND
Answer: B) NOT
How many input combinations are possible for a 3-input logic gate?

A) 4
B) 8
C) 16
D) 32
Answer: B) 8
Which logic gate is also known as the Universal Gate?

A) OR
B) NAND
C) XOR
D) NOR
Answer: B) NAND
In Boolean algebra, what is the complement of AND operation?

A) OR
B) NAND
C) XOR
D) NOT
Answer: B) NAND
What is the output of an XOR gate if both inputs are HIGH (1)?

A) 0
B) 1
C) Depends on the circuit
D) Undefined
Answer: A) 0
Which logic gate is used for arithmetic operations in computers?

A) AND
B) OR
C) XOR
D) ALU
Answer: D) ALU
What is the Boolean expression for the OR operation?

A) A’B’
B) AB
C) A + B
D) A ⊕ B
Answer: C) A + B
What is the truth table for a NOT gate?

A)
markdown
Copy code
A | Q
—–
0 | 1
1 | 0
B)
markdown
Copy code
A | Q
—–
0 | 0
1 | 1
C)
markdown
Copy code
A | Q
—–
0 | 0
1 | 0
D)
markdown
Copy code
A | Q
—–
0 | 1
1 | 1
Answer: A)
What is the Boolean equation for a NAND gate?

A) A’B’
B) AB
C) A + B
D) A ⊕ B
write more
ChatGPT
Sure, here are more multiple-choice questions (MCQs) on Digital Logic Design:

What is the Boolean equation for a NAND gate?

A) A’B’
B) AB
C) A + B
D) A ⊕ B
Answer: A) A’B’
Which gate has an output of 1 only if all inputs are 0?

A) AND
B) OR
C) XOR
D) NOR
Answer: D) NOR
In a 4-bit binary adder, what is the maximum decimal sum possible?

A) 7
B) 8
C) 15
D) 16
Answer: C) 15
Which logic gate is equivalent to the Boolean expression (A + B)’?

A) NOT
B) NAND
C) XOR
D) NOR
Answer: B) NAND
What is the output of an OR gate if both inputs are LOW (0)?

A) 0
B) 1
C) Depends on the circuit
D) Undefined
Answer: A) 0
Which gate is known as the Exclusive-OR gate?

A) AND
B) OR
C) XOR
D) NOT
Answer: C) XOR
Which logic gate is represented by the expression A’B’ + AB?

A) XOR
B) NAND
C) NOR
D) XNOR
Answer: D) XNOR
What is the result of (A AND B) OR (A AND NOT B) in Boolean algebra?

A) A
B) B
C) A XOR B
D) A OR B
Answer: A) A
How many logic gates are required to implement a full adder circuit?

A) 1
B) 2
C) 3
D) 4
Answer: C) 3
Which gate is used for comparing two binary numbers in digital circuits?

A) AND
B) OR
C) XOR
D) Comparator
Answer: D) Comparator
What is the main function of a flip-flop in digital circuits?

A) Add two numbers
B) Store a single bit of data
C) Perform logical operations
D) Convert analog to digital signals
Answer: B) Store a single bit of data
Which type of flip-flop has two stable states and requires two input signals?

A) D flip-flop
B) T flip-flop
C) JK flip-flop
D) SR flip-flop
Answer: C) JK flip-flop
What is the output of an SR flip-flop if both inputs S and R are HIGH (1)?

A) Q = 0, Q’ = 0
B) Q = 1, Q’ = 1
C) Depends on the previous state
D) Undefined
Answer: D) Undefined
Which logic gate is the complement of an AND gate?

A) OR
B) NOT
C) XOR
D) NAND
Answer: D) NAND
What is the function of a multiplexer (MUX) in digital circuits?

A) Add two numbers
B) Store a single bit of data
C) Perform logical operations
D) Select one of many inputs and route it to a single output
Answer: D) Select one of many inputs and route it to a single output
Which type of memory retains its data without power?

A) SRAM
B) DRAM
C) ROM
D) Flash
Answer: C) ROM
What is the advantage of using synchronous counters over asynchronous counters?

A) Lower power consumption
B) Faster operation
C) Simpler design
D) Easier to cascade
Answer: B) Faster operation
In a digital system, what does the term ‘clock cycle’ refer to?

A) The time taken to execute one instruction
B) The time between two consecutive clock pulses
C) The speed of the processor
D) The amount of data processed per second
Answer: B) The time between two consecutive clock pulses
Which logic gate has an output that is the complement of an XOR gate?

A) NAND
B) NOR
C) XNOR
D) AND
Answer: C) XNOR
What is the primary function of a decoder in digital circuits?

A) Store data
B) Perform arithmetic operations
C) Generate a unique output code for each input pattern
D) Convert analog signals to digital
Answer: C) Generate a unique output code for each input pattern
These questions cover various aspects of digital logic design, including basic gates, flip-flops, counters, and memory types.

write more
ChatGPT
Certainly! Here are more multiple-choice questions (MCQs) on Digital Logic Design:

Which type of logic gate is used to implement addition in binary arithmetic circuits?

A) AND
B) OR
C) XOR
D) NOT
Answer: C) XOR
What is the Boolean expression for the NOR gate?

A) A’B’
B) AB
C) A + B
D) A ⊕ B
Answer: A) A’B’
In a half adder circuit, what do SUM and CARRY represent?

A) Sum and product of two binary numbers
B) Result and overflow of addition operation
C) Result and carry-over from addition of two binary digits
D) Sum and difference of two binary numbers
Answer: C) Result and carry-over from addition of two binary digits
Which logic gate is equivalent to the Boolean expression A’B’ + AB?

A) XOR
B) NAND
C) NOR
D) XNOR
Answer: D) XNOR
What is the output of a NAND gate if both inputs are HIGH (1)?

A) 0
B) 1
C) Depends on the circuit
D) Undefined
Answer: A) 0
Which logic gate is used for subtraction in digital circuits?

A) AND
B) OR
C) XOR
D) NOT
Answer: C) XOR
What is the Boolean equation for a NOR gate?

A) A’B’
B) AB
C) A + B
D) A ⊕ B
Answer: A) A’B’
How many possible combinations of inputs are there for a 4-input OR gate?

A) 8
B) 12
C) 16
D) 24
Answer: C) 16
Which logic gate is represented by the expression (A + B)’?

A) NOT
B) NAND
C) XOR
D) NOR
Answer: D) NOR
In Boolean algebra, what is the complement of OR operation?

A) AND
B) NAND
C) XOR
D) NOT
Answer: B) NAND
What is the output of an XOR gate if both inputs are LOW (0)?

A) 0
B) 1
C) Depends on the circuit
D) Undefined
Answer: A) 0
Which gate has an output of 0 only if all inputs are 1?

A) AND
B) OR
C) XOR
D) NOR
Answer: A) AND
What is the result of (A OR B) AND (A NAND B) in Boolean algebra?

A) A
B) B
C) A XOR B
D) A OR B
Answer: A) A
How many logic gates are required to implement a half adder circuit?

A) 1
B) 2
C) 3
D) 4
Answer: B) 2
Which gate is used for selecting one of many inputs and routing it to a single output in digital circuits?

A) AND
B) OR
C) XOR
D) Multiplexer
Answer: D) Multiplexer
What is the primary function of a demultiplexer (DEMUX) in digital circuits?

A) Store data
B) Perform arithmetic operations
C) Generate a unique output code for each input pattern
D) Distribute one input to many outputs
Answer: D) Distribute one input to many outputs
Which type of flip-flop has a clock input and changes state only on a clock edge?

A) D flip-flop
B) T flip-flop
C) JK flip-flop
D) SR flip-flop
Answer: A) D flip-flop
What is the output of an SR flip-flop if both inputs S and R are LOW (0)?

A) Q = 0, Q’ = 0
B) Q = 1, Q’ = 1
C) Depends on the previous state
D) Undefined
Answer: C) Depends on the previous state
Which logic gate is the complement of a NOR gate?

A) OR
B) NOT
C) XOR
D) NAND
Answer: A) OR
What is the function of a shift register in digital circuits?

A) Store data
B) Perform arithmetic operations
C) Generate clock pulses
D) Convert analog signals to digital
Answer: A) Store data

Digital Logic Design MCQs

More MCQS on Electronics MCQs

Leave a Comment Cancel reply