Class 9 Computer — Memory and Storage Important Questions with Answers (Long answers)

Bit → nibble (4) → byte (8) → KB → MB → GB → TB, each step ×1024 after byte. Example: 2 GB = 2×1024 MB = 2048 MB = 2048×1024 KB. Another: a 512 MB file is 512/1024 GB = 0.5 GB. RAM is primary and volatile; a 4 GB pen drive is secondary. Cache sits between CPU and RAM for speed. Exam answers must show the factor 1024, not silent 1000, unless the question says SI units.

HDD: large, cheaper per GB, moving parts, slower, used as main disk in older desktops. SSD: faster, no spinning platter, common in newer laptops, costs more per GB. Pen drive: portable flash for submitting practicals; easy to lose or infect. All are secondary storage. Do not keep the only copy of a board project on one cheap pen drive. Eject safely to avoid file corruption.

5 GB = 5 × 1024 MB = 5120 MB. 5120 MB = 5120 × 1024 KB = 5,242,880 KB. Bytes = 5,242,880 × 1024 = 5,368,709,120 bytes. Write 1024 at each step. If the examiner uses 1000, they will say so. Also state that this measures storage size, not internet speed.