Which level is this paper for?

Secondary 4 ICT, used with the computer hardware and peripherals chapter.

What should I do after marking?

Redo only the wrong items and note whether the slip was conversion, units or concept.

S4 ICT | Computer Hardware and Peripherals Practice Paper 4

2026-11-03

Tutor Prep Guide · Secondary ICT

Paper 4 recombines the earlier slips into ten checking items on units, device types and compression.

Attempt first, mark afterwards　Allow about twenty-five minutes; give only the final answer, then check the note for the wrong step.

01　Paper details (check answers afterwards)

Item	Detail
Questions	10 items
Suggested time	About 25 minutes
Difficulty mix	Foundation 4 · Intermediate 3 · Challenge 2 · Error redo 1
Chapter	Chapter: S4 ICT \| Computer Hardware and Peripherals Tutor Prep Guide
Level	S4 (Secondary 4) ICT

02　Questions (10 items)

FoundationHow many GiB are there in 1 TiB?
FoundationWhat is ROM mainly used for in a computer?
FoundationWhat device types are a speaker and a microphone?
FoundationWhich music file format uses lossy compression: .mp3 or .wav?
IntermediateAn uncompressed 2,560 x 1,440 screenshot at 24-bit colour takes about how many MB (1 MB = 1,000,000 B)?
IntermediateBacking up 60 GB at 20 MB per second takes how many minutes (1 GB = 1,000 MB)?
IntermediateA 48 MB file shrinks to 6 MB after compression. What is the compression ratio?
ChallengeVirtual memory makes the address space look larger than the real RAM. Where does it actually live?
ChallengeScanning 4 square inches at 1,200 dpi x 1,200 dpi gives at most how many dots?
Error redoA student treats 16 GB of RAM and a 16 GB hard disk as the same thing. What is wrong?

03　Answers and one-line notes

#	Answer	One-line note
1	1,024 GiB	Binary prefixes step by 1,024, so 1 TiB = 1,024 GiB.
2	Holding the start-up program and firmware, which survive a power cut	On start-up the processor reads its first instructions from ROM and loads the system into RAM.
3	A speaker is an output device and a microphone is an input device	Both handle sound but the data flows in opposite directions, a common trap.
4	.mp3	MP3 drops detail the ear barely notices, while WAV usually stores uncompressed samples.
5	About 11.06 MB	2,560 x 1,440 x 3 = 11,059,200 B.
6	50 minutes	60,000 / 20 = 3,000 seconds, which is 50 minutes.
7	8:1	48 / 6 = 8, so the original is eight times the compressed size.
8	In a paging file on the hard disk or SSD, far slower than RAM	The paging file trades storage space for capacity, and heavy swapping slows the system.
9	5,760,000 dots	1,200 x 1,200 x 4 = 5,760,000.
10	RAM is volatile, fast and small; a hard disk is non-volatile, slow and large, so their roles differ	The units look alike but the jobs differ, and mixing them up leads to bad buying choices.

04　What to do after marking

After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
Repeat the same item two days later; move to the next paper only when both attempts are correct.
Parents only need the answer and note columns; there is no need to explain every item.

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Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.