Paper 1 · ICT
UGC NET December 2021 June 2022 (09.07.2022) Shift-I
Arrange the following computer memory types from fastest to slowest speed.
- 1. Hard disk
- 2. Main memory (RAM)
- 3. CD-ROM
- 4. CPU registers
- 5. Cache memory
A4, 5, 1, 2, 3
B1, 3, 2, 4, 5
C5, 4, 2, 1, 3
D4, 5, 2, 1, 3 ✓ Correct
Correct answer: (D) 4, 5, 2, 1, 3 — The order from fastest to slowest is 4, 5, 2, 1, 3.
Explanation
★The order from fastest to slowest is 4, 5, 2, 1, 3.
★CPU registers are the fastest, sitting inside the processor itself.
★Cache memory comes next, a small high speed buffer close to the CPU.
★Main memory or RAM is slower than cache but faster than storage.
★The hard disk is a much slower magnetic storage device.
★The CD-ROM is the slowest, an optical medium read by a laser.
★This memory hierarchy trades speed against capacity and cost at each level.
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