Which of the following statements are true in the context of cache memory?

1.Cache memory is used to reduce the average time to access data from main memory

2.Cache memory is costlier than main memory or disk memory but more economical than CPU registers

3.Cache memory is an extremely fast memory that acts as a buffer between RAM and the CPU

A1, 2 and 3 ✓ Correct

B2 and 3

C1 and 2

D1 and 3

Correct answer: (A) 1, 2 and 3

Explanation

All three statements about cache memory are true.

Statement 1 is right, since cache reduces the average time to fetch data from main memory.

Statement 2 is right, since cache costs more than main or disk memory yet less than CPU registers.

Statement 3 is right, since cache is a very fast buffer between RAM and the CPU.

Cache stores frequently used data so repeated access is quicker.

Modern processors use several cache levels labelled L1, L2 and L3.

Want more like this? Create a free account to practise a full test, track your progress, and get spaced-repetition review.