Question

Match List-I with List-II.

List-I	List-II
A. Decoder	I. Selects one input out of many
B. Multiplexer	II. Converts binary input into $2^n$ outputs
C. Encoder	III. Converts $2^n$ inputs into binary code
D. Demultiplexer	IV. Routes one input to several outputs

Choose the correct answer from the options given below:

• A. A-I, B-II, C-III, D-IV
• B. A-II, B-I, C-III, D-IV
• C. A-III, B-I, C-IV, D-II
• D. A-IV, B-III, C-II, D-I

Hint:

MUX = many to one, DEMUX = one to many.

Answer 1

The Correct Option is B

Concept: Each digital component performs a specific signal transformation.

Step 1: Match A (Decoder).
• Converts binary input into multiple outputs
• Output lines = $2^n$ \[ A \rightarrow II \]

Step 2: Match B (Multiplexer).
• Selects one input from many inputs \[ B \rightarrow I \]

Step 3: Match C (Encoder).
• Converts multiple inputs into binary code \[ C \rightarrow III \]

Step 4: Match D (Demultiplexer).
• Routes one input to multiple outputs \[ D \rightarrow IV \]

Step 5: Final mapping. \[ A-II,\ B-I,\ C-III,\ D-IV \] \[ \boxed{(2)} \]