MCQs — Computer Systems

Practice questions for Computer Science.

Question 141

Two computers have the same CPU speed, but one has a 64-bit data bus and the other a 32-bit data bus. Which statement is correct?

A. The 32-bit computer moves more data per transfer

B. The 64-bit computer can move more data in each transfer

C. Both always move the same amount of data per transfer

D. Bus width has no relation to data transfer

Question 142

Primary memory is the memory that:

A. Is used only for backups

B. Is found only in printers

C. Is always slower than a hard disk

D. Is accessed directly by the CPU

Question 143

Which of the following is an example of secondary memory?

A. Hard disk

B. RAM

C. Cache

D. Registers

Question 144

How does primary memory generally differ from secondary memory?

A. It is slower, larger and permanent

B. It is faster and smaller, while secondary memory is slower and larger

C. It is used only to display images

D. It has no connection with the CPU

Question 145

Why must a program be copied from secondary memory into primary memory before it runs?

A. Because secondary memory cannot store programs

B. Because primary memory is cheaper

C. Because the CPU works directly with primary memory

D. Because the monitor needs it

Question 146

Which pair contains only primary memory?

A. Hard disk and DVD

B. USB drive and hard disk

C. DVD and RAM

D. RAM and ROM

Question 147

What does RAM stand for?

A. Random Access Memory

B. Read Access Machine

C. Rapid Action Memory

D. Run Any Module

Question 148

RAM is mainly used to hold:

A. The computer's startup instructions permanently

B. Programs and data currently in use

C. Files for long-term backup

D. Printed documents

Question 149

Why is RAM called 'random access' memory?

A. Because its data is chosen randomly by users

B. Because it can only be read in order from the first location

C. Because any location can be reached directly in about the same time

D. Because it works only by chance

Question 150

A computer becomes very slow when many programs are open at once. Which upgrade would most likely help?

A. Changing the keyboard

B. Using a bigger monitor

C. Using a louder speaker

D. Adding more RAM

Question 151

Which statement about RAM is correct?

A. Data can be both read from and written to it

B. It can be read but never written

C. It is a permanent storage medium

D. It cannot be accessed by the CPU

Question 152

What does ROM stand for?

A. Random Output Module

B. Read Only Memory

C. Rapid Operating Machine

D. Read Output Memory

Question 153

What is ROM mainly used to store?

A. The user's documents

B. Photos taken by the user

C. Startup instructions needed when the computer is switched on

D. Websites being visited

Question 154

Why can ordinary users not easily change the contents of ROM?

A. It has no data in it

B. It is always disconnected

C. It stores only images

D. It is designed to hold permanent instructions set by the manufacturer

Question 155

Which of the following is typically stored in ROM?

A. The BIOS or bootstrap program

B. A student's homework file

C. A downloaded movie

D. A game being played

Question 156

What is the main purpose of cache memory?

A. To store movies permanently

B. To store frequently used data and instructions for quick CPU access

C. To connect the computer to the internet

D. To display output

Question 157

Compared with RAM, cache memory is generally:

A. Slower and larger

B. Slower and cheaper

C. Faster but smaller and more expensive

D. The same speed and size

Question 158

A program repeats the same set of instructions many times in a loop. How does cache help?

A. It deletes the instructions after each use

B. It makes the monitor brighter

C. It increases the size of the hard disk

D. It keeps those instructions near the CPU, reducing waiting time

Question 159

Two computers are identical except that one has a larger cache. What is the most likely result?

A. The one with the larger cache can keep more frequently used data nearby and may perform repeated tasks faster

B. The one with the larger cache will have a smaller screen

C. The one with the smaller cache will store more files

D. There can be no difference at all

Question 160

Which list arranges these memories from fastest to slowest?

A. Hard disk, RAM, cache, registers

B. Registers, cache, RAM, hard disk

C. RAM, registers, hard disk, cache

D. Cache, hard disk, registers, RAM

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