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MCQs — Computer Systems

Practice questions for Computer Science.

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Question 81

The speed of a CPU is usually measured in:

A. Kilometres per hour

B. Gigahertz (GHz)

C. Pixels

D. Watts

Question 82

A user replaces the CPU with a newer one that has a higher clock speed. What is the most likely effect?

A. The screen becomes larger

B. The keyboard types faster on its own

C. The computer can execute instructions faster

D. Files are stored permanently in RAM

Question 83

A technician tests the CPU, RAM and hard disk separately and finds each one working. Installed together, they cannot communicate. Which part is most likely faulty?

A. Mouse

B. Speaker

C. Webcam

D. Motherboard

Question 84

What is the main job of the power supply unit (PSU) in a desktop computer?

A. To convert mains AC into the low-voltage DC needed by components

B. To store the user's files

C. To display graphics

D. To connect the computer to the internet

Question 85

Expansion slots on a motherboard allow the user to:

A. Change the colour of the monitor

B. Add cards such as a graphics card or sound card

C. Print documents faster on paper

D. Connect the mouse wirelessly only

Question 86

Why can't internal components be connected directly to a wall socket without a power supply unit?

A. Wall sockets supply only data

B. Components do not need any power

C. Components need low-voltage DC, while the wall supplies higher-voltage AC

D. Wall sockets provide power only to monitors

Question 87

A traditional hard disk drive (HDD) stores data on:

A. Punched holes in cards

B. Ink on paper

C. Vacuum tubes

D. Spinning magnetic platters

Question 88

Compared with an HDD, a solid-state drive (SSD) is generally:

A. Faster, quieter and has no moving parts

B. Slower and more easily damaged by shocks

C. Dependent on a spinning disk

D. Unable to store files

Question 89

CDs, DVDs and Blu-ray discs are read using:

A. A magnetic head

B. A laser beam

C. A keyboard

D. A cooling fan

Question 90

A student wants to carry a presentation between school and home easily. Which storage device is most suitable?

A. Internal hard disk

B. Motherboard

C. USB flash drive

D. Power supply

Question 91

A school needs low-cost, large-capacity storage to keep years of records. Which is the best choice?

A. Cache memory

B. Register

C. RAM

D. Hard disk drive

Question 92

The design in which a CPU, memory and input/output units are organised so that instructions and data share the same memory is called:

A. Punched-card architecture

B. Von Neumann architecture

C. Mechanical architecture

D. Abacus architecture

Question 93

The name 'von Neumann' in von Neumann architecture refers to:

A. A type of memory chip

B. A famous computer company

C. A mathematician who described the design in the 1940s

D. A programming language

Question 94

What is the main purpose of the von Neumann architecture?

A. To decide the colour of the screen

B. To connect computers over the internet

C. To replace the operating system

D. To provide a basic framework showing how the CPU, memory and I/O units work together

Question 95

Early machines like ENIAC had to be rewired for each new task. How does von Neumann architecture avoid this?

A. By storing the program in memory, so a new task only needs new instructions

B. By using more vacuum tubes

C. By making the machine larger

D. By printing every instruction on paper

Question 96

Which statement about von Neumann architecture is correct?

A. Instructions are kept only in ROM and data only in cache

B. Instructions and data are kept in the same memory

C. The CPU has no control unit

D. Input devices execute the instructions

Question 97

What does the stored-program concept mean?

A. Programs are kept only on paper

B. Programs are wired permanently into the CPU

C. Both instructions and data are stored in the computer's memory

D. Only data, not instructions, is kept in memory

Question 98

A major advantage of the stored-program concept is that a computer can:

A. Work without any memory

B. Run without a CPU

C. Store data only on paper

D. Perform different tasks by loading different programs

Question 99

When a student opens a word processor, the CPU can run it because:

A. The program's instructions have been loaded into main memory

B. The keyboard sends the entire program to the monitor

C. The monitor stores the program

D. The mouse holds the instructions

Question 100

Which set lists the main components of the von Neumann model?

A. Keyboard, mouse, monitor and printer only

B. CPU, memory, input unit and output unit

C. Operating system, drivers and utilities only

D. Router, switch, cable and modem

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