/en-tutor-prep-s4-ict-data-network-practice-1/
/en-tutor-prep-s4-ict-data-network-practice-1/
英文版
3
General Inquiry: info@TutorZone.com.hk
Office Hours: Monday to Saturday - 9:00 AM to 6:00 PM
WhatsApp Monday to Sunday - 24 hours
Hotline: +852 6828 1809
Instant Support: +852 9061 3106

S4 ICT: Data Representation and Networks Practice Paper 1 (10 questions with answers)

S4 ICT: Data Representation and Networks Practice Paper 1 (10 questions with answers)

  • 2026-10-30

Tutor Prep Guide · Secondary ICT

S4 ICT: Data Representation and Networks Practice Paper 1 (10 questions with answers)

Paper 1 builds the base: bits and bytes, powers of two, binary and hex conversion, colour depth, then image and audio file sizes, LAN versus WAN and primary keys.

Direct answer　Always convert with powers of two: eight bits to a byte and 1 024 bytes to a kilobyte; for media files multiply sample rate, bytes per sample, channels and seconds.

01　Paper details (check answers afterwards)

Item Detail
Questions 10 items
Suggested time 20 to 25 minutes
Difficulty mix Foundation 4 · Intermediate 3 · Challenge 2 · Error redo 1
Chapter Chapter: S4 ICT: Data Representation and Networks – Tutor Lesson Plan
Level S4 (DSE ICT)

02　Questions (10 items)

  1. FoundationHow many bits are there in one byte?
  2. FoundationHow many megabytes are there in one gigabyte?
  3. FoundationWhat is denary 45 in 8-bit binary?
  4. FoundationHow many colours can a 16-bit colour depth show at most?
  5. IntermediateWhat is the approximate file size of an uncompressed 1024 × 768 pixel image at 24-bit colour?
  6. IntermediateAn uncompressed stereo recording of 60 seconds at 44,100 Hz with 16-bit sampling is about how large?
  7. IntermediateWhat is denary 255 in 8-bit hexadecimal?
  8. ChallengeWhat is the difference between a LAN and a WAN?
  9. ChallengeWhat is the purpose of a primary key in a database?
  10. Error redoA student treats 1 KB as 1 000 bytes. What is the correct value?

03　Answers and one-line notes

# Answer One-line note
1 8 bits Eight bits make one byte, which can hold 256 values from 0 to 255.
2 1 024 MB Computers count in powers of two, and two to the power ten is 1 024, not 1 000.
3 00101101, that is 32 + 8 + 4 + 1 Subtract the place values: 45 − 32 = 13, then − 8 = 5, − 4 = 1, − 1 = 0, so bits six, four, three and one are set.
4 65,536 colours Each pixel carries 16 bits with two states per bit, so two to the power 16 gives 65536.
5 2,359,296 bytes, about 2.25 MB 1024 × 768 = 786,432 pixels at three bytes each gives 2,359,296 bytes, and dividing by 1 048 576 gives 2.25 MB.
6 10,584,000 bytes, about 10.09368896484375 MB 44,100 × 2 bytes × 2 channels × 60 s = 10,584,000 bytes, which is 10.09368896484375 MB.
7 FF, eight ones split into 1111 and 1111 Each hex digit covers four bits: 1111 is denary 15, written F, so both groups are F.
8 A LAN covers one building or campus and is managed in house, giving high bandwidth and low latency; a WAN spans cities or countries, usually over leased carrier lines, with lower bandwidth and higher latency. Decide by coverage and ownership; the Internet is the largest WAN.
9 It uniquely identifies each record in a table and can be neither duplicated nor left empty. A student number works as a primary key, while a name may be shared and is a poor choice.
10 1 024 bytes Two to the power ten is 1 024; drive makers sometimes use 1 000, but in an exam the answer is 1 024.

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.

Book an ICT tutor assessment

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.