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GATE CSE 2022 Q24: False statements about write-back and write-through caches

Question

Let WB and WT be two set associative cache organizations that use LRU algorithm for cache block replacement. WB is a write back cache and WT is a write through cache. Which of the following statements is/are FALSE?

Try it: multiple select: one or more correct options

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Select all correct options. No negative marking, no partial marks.
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Answer: A, B, D (official GATE 2022 final answer key)

Concept used: Write-through keeps memory current on every write (no dirty bit needed); write-back writes a block to memory only when a dirty block is evicted.

First step: For each statement, ask when each policy actually writes to main memory.

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Source: official GATE 2022 CS question paper and final answer key, organised by IIT Kharagpur. Question paper · Answer key

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