Multiplexers and Demultiplexers MCQ
What is the primary function of a multiplexer (MUX) in digital circuits?
A) Combine multiple signals into one
B) Split a signal into multiple outputs
C) Perform arithmetic operations
D) Store data temporarily
Answer: A
What is the primary function of a demultiplexer (DEMUX) in digital circuits?
A) Combine multiple signals into one
B) Split a signal into multiple outputs
C) Perform arithmetic operations
D) Store data temporarily
Answer: B
Which of the following statements about multiplexers is true?
A) They have one input and multiple outputs.
B) They have multiple inputs and one output.
C) They perform logical operations.
D) They store data for later use.
Answer: B
Which of the following statements about demultiplexers is true?
A) They have one input and multiple outputs.
B) They have multiple inputs and one output.
C) They perform logical operations.
D) They store data for later use.
Answer: A
What is the primary purpose of a multiplexer with
𝑛
n select lines?
A) To select one of
𝑛
n input signals to be routed to the output
B) To combine
𝑛
n input signals into one output
C) To perform
𝑛
n logical operations simultaneously
D) To store
𝑛
n bits of data temporarily
Answer: A
What is the primary purpose of a demultiplexer with
𝑛
n select lines?
A) To select one of
𝑛
n output signals from the input
B) To split the input signal into
𝑛
n outputs
C) To perform
𝑛
n logical operations simultaneously
D) To store
𝑛
n bits of data temporarily
Answer: B
Which gate is commonly used internally in multiplexers?
A) XOR gate
B) AND gate
C) OR gate
D) NAND gate
Answer: B
Which gate is commonly used internally in demultiplexers?
A) XOR gate
B) AND gate
C) OR gate
D) NAND gate
Answer: B
What is the minimum number of select lines required for an 8to1 multiplexer?
A) 2
B) 3
C) 4
D) 8
Answer: B
What is the minimum number of select lines required for a 1to8 demultiplexer?
A) 2
B) 3
C) 4
D) 8
Answer: B
Which of the following is a characteristic of multiplexers?
A) They reduce the number of inputs.
B) They increase the number of outputs.
C) They are used for paralleltoserial conversion.
D) They perform logical operations.
Answer: C
Which of the following is a characteristic of demultiplexers?
A) They reduce the number of inputs.
B) They increase the number of outputs.
C) They are used for serialtoparallel conversion.
D) They perform logical operations.
Answer: C
In a 4to1 multiplexer, how many data input lines are there?
A) 1
B) 2
C) 4
D) 8
Answer: C
In a 1to4 demultiplexer, how many output lines are there?
A) 1
B) 2
C) 4
D) 8
Answer: C
Which gate is used for selecting the input lines in a multiplexer?
A) XOR gate
B) AND gate
C) OR gate
D) NAND gate
Answer: B
Which gate is used for selecting the output lines in a demultiplexer?
A) XOR gate
B) AND gate
C) OR gate
D) NAND gate
Answer: B
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