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Module 1: Functional Block of computer and Data representaion

20252m

The unit responsible for fetching, decoding, and executing instructions is:
(i) ALU
(ii) Memory Unit
(iii) Control Unit
(iv) I/O Unit

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Answer: (iii) Control Unit

Explanation:

  • Control Unit (CU): Generates timing & control signals, fetches instruction (via PC/MAR/MDR), decodes it (via IR/decoder), and directs ALU, memory and I/O to execute it.
  • ALU only does arithmetic/logic, Memory Unit stores, I/O Unit interfaces with peripherals.

Note: In broader sense CPU (CU + ALU) does FDE, but among given options CU is the coordinating unit responsible for the cycle.

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