Question

Which statement best justifies the use of a high-speed cache in a CPU?
A.
It decreases the time it takes to decode instructions stored in the instruction pipeline.
B. It provides additional storage space for when the main memory runs out of free space.
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C.
It increases the number of instructions understood by the CPU.
D. It reduces the time required for memory read-write operations because it is part of the CPU.
E. It increases the time the CPU takes to execute instructions in one cycle.
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Answer 1

Cache memory is a high-speed memory that stores the instructions and data that have been frequently accessed.  It decreases the time it takes to decode the instructions stored in the instruction pipeline.

A.  It decreases the time it takes to decode instructions stored in the instruction pipeline.

Explanation:

Whenever an instruction is invoked or some data is accessed, the CPU looks for it in the cache memory before accessing the main memory.

If the content is found in the cache memory, it accessed from there and then and hence the access time and decode time is reduced as there were no main memory lockups.