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ISRO CS 2023 Q.21: solution and answer

ISRO 2023 · CSQ.21 · 1 mark · MCQ

The operation executed on data stored in registers is called

  1. (A)

    Macro-operation

  2. (B)

    Micro-operation

  3. (C)

    Bit-operation

  4. (D)

    Byte-operation

See the question in the paper
ISRO CS 2023 question 21Tap to open full size

Answer and solution

ANSWER

The correct option is (b), Micro-operation.

Official answer: BSource: ISRO's revised and final answer key of 16 February 2024

  1. The question asks for the standard name of an operation performed on data held in registers.

  2. In computer organization, a micro-operation is an elementary operation executed on data stored in one or more registers during one clock period.

  3. Examples are register transfer, arithmetic, logic and shift micro-operations, such as .

  4. A macro-operation is a full machine instruction, which is built from a sequence of micro-operations, so it is not the operation on register data itself.

  5. Bit-operation and byte-operation are not standard terms in this sense. They describe only the width of data handled.

  6. So the correct option is (b) Micro-operation.

KEY IDEA

An operation performed on data held in registers is a micro-operation. Each machine instruction is carried out as a sequence of such micro-operations.

WATCH OUT FOR

Choosing Macro-operation because it sounds like the larger, more familiar term. A macro-operation is the whole instruction, not the single register-level step.

From the ISRO CS 2023 paper. Every question of this paper · The full paper (PDF, ISRO) · All 1 ISRO ALU & control unit question, with notes