Computer Studies

Includes fundamentals of computers, hardware and software, operating systems, MS Office, internet, networking, and basic IT concepts for recruitment exams.

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1
Which register pair works together during memory access — one holding the address and one holding the data?
Hard 3 Marks
One register holds where to look the other holds what is found there.
A PC and IR
B ACC and PC
C MAR and MDR
D IR and ACC
2
A program instruction says: add two numbers and store the result. Which sequence of CPU components is involved?
Hard 3 Marks
Trace the instruction through each CPU component in order.
A CU fetches then IR decodes then MAR executes
B PC provides address CU fetches and decodes ALU adds ACC stores result
C MDR fetches ALU decodes CU executes
D IR fetches MAR decodes MDR executes
3
Which of the following correctly identifies all three main CPU components and their roles?
Hard 3 Marks
Match each component to its specific role — control calculate or store.
A CU performs calculations ALU controls data flow Registers store programs permanently
B CU controls and coordinates ALU performs arithmetic and logic Registers provide fast temporary storage
C CU stores data ALU fetches instructions Registers decode operations
D CU manages secondary storage ALU manages primary memory Registers manage I/O devices
4
If the Program Counter currently holds address 100 and an instruction is fetched what value will the PC most likely hold next?
Hard 3 Marks
The PC must always point to the NEXT instruction — what address comes after 100?
A Still 100
B 99 (decremented by 1)
C 101 (address of the next instruction)
D 0 (reset after each fetch)
5
What is the Central Processing Unit (CPU)?
Easy 1 Mark
The CPU is often called the brain of the computer.
A The screen that displays output to the user
B The main processing component of a computer that executes instructions and controls all hardware
C The storage device used to save permanent files
D The component that supplies power to the computer
6
Why is the CPU often called the brain of the computer?
Easy 1 Mark
Think about what role the brain plays in a human body.
A Because it stores all data permanently
B Because it is the largest component inside a computer
C Because it performs most processing tasks and controls all other hardware components
D Because it generates power for all other components
7
Which of the following tasks does the CPU perform?
Easy 1 Mark
Think about the core jobs a processor does every second.
A Displaying graphics on the monitor only
B Storing data permanently on the hard disk
C Executing instructions performing calculations and managing data flow
D Supplying electricity to input and output devices
8
The CPU communicates with which of the following to perform its tasks?
Medium 2 Marks
What other parts of a computer does the CPU need to interact with?
A Only the monitor and keyboard
B Memory devices input devices and output devices
C Only secondary storage devices
D Only the power supply unit
9
What are the three main components of the CPU?
Easy 1 Mark
Think about the units that control calculate and temporarily store data inside the CPU.
A RAM ROM and Cache
B Hard disk SSD and USB
C Control Unit ALU and Registers
D Monitor Keyboard and Mouse
10
What is the role of the Control Unit (CU) in the CPU?
Easy 1 Mark
The CU does not process data — it manages and directs everything.
A To perform arithmetic calculations on data
B To store large amounts of data permanently
C To control and coordinate all operations of the computer and direct data movement
D To supply power to the CPU components
11
Does the Control Unit perform actual data processing?
Easy 1 Mark
The CU is like a manager — it tells others what to do but does not do the work itself.
A Yes it performs all arithmetic operations
B Yes it performs logical comparisons
C No it only manages and supervises how instructions are executed
D Yes it stores all intermediate results
12
What does the Control Unit generate to instruct other components?
Medium 2 Marks
Think about how a conductor uses signals to direct an orchestra.
A Electrical power signals
B Control signals
C Binary data packets
D Arithmetic results
13
Which of the following is a function of the Control Unit?
Medium 2 Marks
What happens if instructions are executed out of order?
A Performing addition and subtraction of numbers
B Storing data in secondary storage devices
C Ensuring instructions are executed in the correct order (instruction sequencing)
D Refreshing RAM contents periodically
14
The Control Unit manages data transfer between which components?
Medium 2 Marks
The CU oversees all data movement — not just inside the CPU.
A Only between RAM and ROM
B CPU memory and input/output devices
C Only between the ALU and registers
D Only between the monitor and keyboard
15
Why is the Control Unit essential to a computer system?
Medium 2 Marks
Imagine a construction site without a foreman — what would happen?
A Because it performs all mathematical calculations
B Because without it different parts of a computer would not know when or how to perform their tasks
C Because it stores the operating system permanently
D Because it provides electricity to all components
16
What does the ALU stand for?
Easy 1 Mark
Break it down: Arithmetic + Logic + Unit.
A Arithmetic Loading Unit
B Arithmetic Logic Unit
C Automated Logic Unit
D Advanced Loading Utility
17
What is the main function of the ALU?
Easy 1 Mark
ALU = Arithmetic + Logic — what two types of operations does it do?
A To store data permanently in the hard disk
B To control the flow of data between CPU and memory
C To perform mathematical calculations and logical operations
D To supply power to the CPU
18
Which of the following is an arithmetic operation performed by the ALU?
Easy 1 Mark
Arithmetic means mathematical calculations — which option is a calculation?
A AND operation
B Greater than comparison
C Subtraction
D NOT operation
19
Which of the following is a logical operation performed by the ALU?
Easy 1 Mark
Logical operations involve true/false decisions — not pure calculations.
A Addition
B Division
C Multiplication
D AND operation
20
Which of the following lists contains ONLY arithmetic operations?
Medium 2 Marks
Arithmetic involves numbers and calculations — identify the purely numerical operations.
A AND OR NOT
B Addition Subtraction Division
C Greater than Less than Equal to
D AND Addition NOT
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Difficulty Distribution
Easy 10
Medium 6
Hard 4