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100+ Free NSSCAS Computer Science (8231) Practice Questions

Prepare for the Namibia Senior Secondary Certificate Advanced Subsidiary Level Computer Science (Syllabus 8231) exam with instant access — no signup required.

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Key Facts: NSSCAS Computer Science (8231) Exam

8231

NSSCAS Computer Science syllabus code

NIED NSSCAS Computer Science Syllabus

60/40

Paper 1 / Paper 2 weighting (%)

NIED NSSCAS Computer Science scheme of assessment

100

Paper 1 marks (3 hours, whole syllabus)

NIED NSSCAS Computer Science Syllabus

75

Paper 2 marks (2 h 30 min, Theme 3 only)

NIED NSSCAS Computer Science Syllabus

175

Combined marks across both papers

NIED NSSCAS Computer Science Syllabus

a–e

Grade scale (syllabus descriptors for a, c, e)

NIED NSSCAS Computer Science Syllabus / grade descriptions

100

Free practice MCQs on this page (study adaptation)

OpenExamPrep

NSSCAS Computer Science 8231 is examined by DNEA through compulsory Paper 1 (100 marks, 3 h, 60%, whole syllabus with algorithms) and Paper 2 (75 marks, 2 h 30 min, 40%, Theme 3 only), totalling 175 marks with grades a–e. Official assessment is extended written work — not MCQ-only. This page’s 100 free questions are an English-language MCQ study adaptation aligned to the NIED syllabus for concept revision only.

Sample NSSCAS Computer Science (8231) Practice Questions

Try these sample questions to test your NSSCAS Computer Science (8231) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In the Von Neumann model, which processor component performs arithmetic and logical operations?
A.Control unit (CU)
B.Arithmetic logic unit (ALU)
C.Program counter (PC)
D.Memory address register (MAR)
Explanation: The ALU carries out arithmetic and logical operations on data. The control unit orchestrates the fetch-execute cycle; the PC and MAR hold addresses rather than compute results.
2Which register holds the address of the next instruction to be fetched from memory?
A.Memory data register (MDR)
B.Current instruction register (CIR)
C.Program counter (PC)
D.Accumulator (ACU)
Explanation: The program counter stores the address of the next instruction. The CIR holds the instruction being decoded/executed; the MDR holds data moving to/from memory; the accumulator holds intermediate results.
3During the fetch stage of the fetch-execute cycle, which transfer is typical?
A.ALU result is written only to secondary storage
B.Contents at the address in the PC are read into the MDR and then the CIR
C.The status register permanently erases all flags
D.The printer queue is always emptied
Explanation: In fetch, the address in the PC is placed in the MAR, memory contents are read into the MDR, then transferred to the CIR for decode and execute. The PC is updated for the next instruction.
4How does increasing bus width typically affect computer performance?
A.It always halves clock speed by law
B.It can allow more bits to be transferred in parallel per cycle, raising data throughput
C.It removes the need for any primary memory
D.It converts all software into firmware only
Explanation: A wider data bus can transfer more bits in one cycle, improving throughput between CPU, memory and peripherals when other factors are equal.
5What is the main role of cache memory?
A.To permanently archive offline backups only
B.To store frequently used instructions and data closer to the CPU to reduce average access latency
C.To replace the need for any secondary storage
D.To encrypt all network packets by default
Explanation: Cache is small, fast memory near the CPU holding recently or frequently used data and instructions so the processor waits less on slower main RAM.
6Which statement correctly contrasts DRAM and SRAM?
A.DRAM never needs refreshing; SRAM must be refreshed thousands of times per second
B.SRAM is typically faster and does not need periodic refresh like DRAM, but is more expensive per bit
C.Both are read-only and cannot hold program data
D.DRAM is only used in optical discs
Explanation: DRAM stores bits in capacitors that need periodic refresh and is dense and cheap for main RAM. SRAM retains data while powered without that refresh and is faster but costlier, often used in caches.
7Virtual memory with paging is best described as:
A.Using disk space to extend apparent RAM by swapping pages between RAM and secondary storage
B.Doubling the physical number of CPU cores automatically
C.Deleting all unused files every second
D.A type of laser printer memory only
Explanation: Virtual memory lets the OS use secondary storage as an extension of RAM. Paging moves fixed-size pages between RAM and disk so more programs can appear to run than physical RAM alone allows.
8Which device is primarily used to join two networks that use different protocols and translate between them?
A.Repeater
B.Gateway
C.Simple hub with no intelligence
D.Refreshable Braille display
Explanation: A gateway interconnects networks that may use different protocols and can translate between them. A repeater regenerates signals; a basic hub floods traffic; an RBD is an accessibility output device.
9What is the main purpose of a network repeater?
A.To translate HTTP into SMTP exclusively
B.To receive a weak signal and retransmit it so the signal can travel further or past an obstruction
C.To store relational tables in third normal form
D.To compile high-level source code
Explanation: A repeater regenerates and retransmits a signal to extend transmission distance or overcome attenuation and obstacles.
10Which cloud model provides virtualised servers, storage and networking on demand without managing the physical data centre?
A.SaaS only as desktop office apps
B.IaaS (Infrastructure as a Service)
C.A local offline calculator
D.RBD accessibility hardware
Explanation: IaaS delivers virtualised infrastructure (compute, storage, networking) over the Internet. SaaS delivers complete applications; PaaS delivers development platforms and tools.

About the NSSCAS Computer Science (8231) Exam

NSSCAS Computer Science (8231) is Namibia’s Advanced Subsidiary Level senior secondary computing qualification for Grade 12 (one-year course after NSSCO Computer Studies). The NIED syllabus (publication 2019; implementation and first examination 2021) covers hardware, software and communication; data representation; circuits and programming; and security, privacy and data integrity. Assessment is two compulsory written papers totalling 175 marks (Paper 1 whole syllabus 60%; Paper 2 Theme 3 40%), administered by DNEA in English, with results reported as grades a–e. Note the subject title Computer Science at AS level differs from Ordinary Level Computer Studies (6134).

Assessment

Paper 1: written paper, compulsory questions of varying length and mark value based on the whole syllabus, 100 marks, 3 hours, 60% (includes at least one algorithm construction question). Paper 2: written paper of compulsory questions set on Theme 3 Circuits and programming, 75 marks, 2 hours 30 minutes, 40%. Both papers required; no choice of questions. Assessment objectives: A Knowledge with understanding, B Skills (problem solving), C Communication.

Time Limit

Paper 1: 3 hours; Paper 2: 2 hours 30 minutes

Passing Score

Letter grades a–e (a highest, e lowest; Ungraded = failed to reach the standard required for a pass at NSSCAS). No single published numeric percentage pass mark in the NIED syllabus. Grade descriptions are provided for judgmental grades a, c and e.

Exam Fee

DNEA per-subject NSSCAS entry fee not confirmed from an official DNEA circular at time of writing — confirm with DNEA or your examination centre. Do not use NAMCOL tuition fees as a substitute. (Directorate of National Examinations and Assessment (DNEA); syllabus by Namibia Institute for Educational Development (NIED))

NSSCAS Computer Science (8231) Exam Content Outline

Theme 1

Hardware, Software and Communication

I/O and storage devices; processor (CU, ALU, registers, buses, clock, fetch-execute, interrupts, addressing modes, multi-core); primary memory, cache and virtual memory; network devices and firewall/proxy; relational databases, normalisation and SQL; language levels and paradigms; OS types and utilities; protocols, Internet/WWW, streaming, Ethernet CSMA/CD and cloud models.

Theme 2

Data Representation

Program data types; arrays, files, linked lists, stacks and queues; serial/sequential/indexed sequential/random file organisation and hashing; binary, BCD and hexadecimal conversions and uses; character codes; image and sound encoding; lossy vs lossless compression.

Theme 3

Circuits and Programming

Logic gates and truth tables; dry runs and trace tables; algorithm design (pseudocode, flowcharts, structure charts, selection, iteration, arrays, ADTs); program implementation standards and IDE tools; syntax/logic/runtime errors and testing; translators; binary and serial search.

Theme 4

Security, Privacy and Data Integrity

Security, privacy and integrity in design; encryption, keys, hashing, tokens and multi-factor access; validation and verification on entry; parity, checksum, ARQ and echo-back checks during transfer.

How to Pass the NSSCAS Computer Science (8231) Exam

What You Need to Know

  • Passing score: Letter grades a–e (a highest, e lowest; Ungraded = failed to reach the standard required for a pass at NSSCAS). No single published numeric percentage pass mark in the NIED syllabus. Grade descriptions are provided for judgmental grades a, c and e.
  • Assessment: Paper 1: written paper, compulsory questions of varying length and mark value based on the whole syllabus, 100 marks, 3 hours, 60% (includes at least one algorithm construction question). Paper 2: written paper of compulsory questions set on Theme 3 Circuits and programming, 75 marks, 2 hours 30 minutes, 40%. Both papers required; no choice of questions. Assessment objectives: A Knowledge with understanding, B Skills (problem solving), C Communication.
  • Time limit: Paper 1: 3 hours; Paper 2: 2 hours 30 minutes
  • Exam fee: DNEA per-subject NSSCAS entry fee not confirmed from an official DNEA circular at time of writing — confirm with DNEA or your examination centre. Do not use NAMCOL tuition fees as a substitute.

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

NSSCAS Computer Science (8231) Study Tips from Top Performers

1Work from the official NIED NSSCAS Computer Science 8231 syllabus PDF — examiners mark to the specific objectives under each theme.
2Practise algorithm dry runs, nested loops, arrays and truth tables thoroughly — Paper 2 is entirely Theme 3 and Paper 1 always includes algorithm construction.
3Show full working for binary/hex conversions; examiners’ reports award method marks and flag missing working.
4Drill precise terminology for network devices (switch, bridge, gateway, repeater), file organisations and validation vs verification — vague answers lose marks.
5Practise SQL SELECT/INSERT/UPDATE/DELETE and third normal form ideas for relational database questions.
6Read the latest NSSCAS Examiners Report for Computer Science 8231 to target weak centres (trace tables, nested loops, CSMA/CD, hashing, encryption wording).

Frequently Asked Questions

What is NSSCAS Computer Science 8231?

NSSCAS Computer Science (syllabus code 8231) is Namibia’s Senior Secondary Certificate Advanced Subsidiary Level computing qualification for Grade 12, with learning content published by NIED and national examinations administered by DNEA. It builds on NSSCO Computer Studies and uses the subject name Computer Science (not Computer Studies).

How is NSSCAS Computer Science assessed?

All candidates take two compulsory written papers with no choice of questions: Paper 1 (whole syllabus, 100 marks, 3 hours, 60%, including at least one algorithm construction question) and Paper 2 (Theme 3 Circuits and programming only, 75 marks, 2 hours 30 minutes, 40%). Combined total is 175 marks.

What grade is needed to pass NSSCAS Computer Science?

Learners are graded on an a–e scale (a highest, e lowest). ‘Ungraded’ means the candidate has not reached the standard required for a pass at NSSCAS. The NIED syllabus gives grade descriptions for a, c and e; there is no single published numeric percentage pass mark.

How much does the NSSCAS Computer Science exam cost?

A public DNEA per-subject national examination fee schedule was not confirmed from an official DNEA circular at the time of writing. Confirm fees with DNEA or your centre, and do not use NAMCOL tuition amounts as the national exam fee.

Are these official DNEA examination questions?

No. Official assessment uses two written papers with variable-length questions, algorithms and programming responses. This bank is an original English-language MCQ study adaptation for syllabus revision only — it does not replace full written answers or official paper simulation.

What topics does the 8231 syllabus cover?

Four themes: hardware, software and communication; data representation; circuits and programming; and security, privacy and data integrity. Paper 1 emphasises Themes 1, 2 and 4 (and algorithms); Paper 2 concentrates on Theme 3.