GATE CSE 2025 Session 2 Q61: Clock cycle duration from an instruction mix

Computer Organization and Architecture
2 marks
NAT
No negative marking

An application executes $6.4 \times 10^8$ number of instructions in 6.3 seconds. There are four types of instructions, the details of which are given in the table. The duration of a clock cycle in nanoseconds is _________. (rounded off to one decimal place)

Instruction type	Clock cycles required per instruction (CPI)	Number of instructions executed
Branch	2	$2.25 \times 10^8$
Load	5	$1.20 \times 10^8$
Store	4	$1.65 \times 10^8$
Arithmetic	3	$1.30 \times 10^8$

Try it: numerical answer: type the value

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Numerical answer. No negative marking.

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Answer: 3 (official GATE 2025 final answer key)

Concept used: Execution time = total clock cycles × cycle time.

First step: Total cycles $= (2 \times 2.25 + 5 \times 1.20 + 4 \times 1.65 + 3 \times 1.30) \times 10^8$ ; divide 6.3 s by it.

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Source: official GATE 2025 Session 2 CS question paper and final answer key, organised by IIT Roorkee. Question paper · Answer key

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GATE CSE 2025 Session 2 Q61: Clock cycle duration from an instruction mix

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