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
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
2
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
3
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
4
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
5
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
6
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
7
Which of the following lists contains ONLY logical operations?
Medium 2 Marks
Logical operations deal with conditions and comparisons not pure calculations.
A Addition Subtraction Multiplication
B AND OR NOT Greater than
C Increment Decrement Division
D Multiplication AND Addition
8
What happens to data after the ALU processes it?
Medium 2 Marks
Results must go somewhere after processing — where do they go?
A It is permanently deleted from the system
B It is sent back to the CPU or stored in a memory location
C It is immediately displayed on the monitor
D It is transferred directly to the hard disk
9
Why is the ALU considered the core computational component of the processor?
Medium 2 Marks
Every mathematical and logical task in a program goes through the ALU.
A Because it controls all other hardware devices
B Because it stores permanent instructions for booting
C Because every program calculation or comparison is processed by the ALU
D Because it manages data transfer between memory and I/O devices
10
What is the Accumulator (ACC) register used for?
Medium 2 Marks
After the ALU calculates something where does the result go temporarily?
A Storing the address of the next instruction to execute
B Holding the current instruction being decoded
C Storing intermediate results during arithmetic and logical operations
D Holding the address of the memory location being accessed
11
What does the Program Counter (PC) hold?
Medium 2 Marks
The PC keeps the CPU on track — it always points to what comes next.
A The result of the most recent calculation
B The current instruction being decoded by the control unit
C The address of the next instruction to be executed by the CPU
D The data being transferred between memory and the CPU
12
What is the Instruction Register (IR) used for?
Medium 2 Marks
IR holds the instruction the CPU is working on right now.
A Storing the address of the next instruction
B Storing the current instruction being executed by the CPU
C Holding intermediate arithmetic results
D Storing the memory address the CPU wants to access
13
What is the Memory Address Register (MAR) used for?
Medium 2 Marks
MAR stores an address — not data itself. Where does the CPU need to look?
A Storing data transferred between memory and the CPU
B Holding the current instruction being executed
C Storing the address of the memory location the CPU wants to read from or write to
D Keeping track of the next instruction address
14
What is the Memory Data Register (MDR) used for?
Medium 2 Marks
MDR holds data in transit between CPU and memory.
A Storing the address of the next instruction
B Temporarily storing data being transferred between memory and the CPU
C Storing the result of the most recent ALU calculation
D Holding control signals sent to other components
15
A student asks: which register always points to the NEXT instruction? The answer is:
Medium 2 Marks
Which register keeps the CPU moving forward through a program?
A Accumulator (ACC)
B Instruction Register (IR)
C Memory Address Register (MAR)
D Program Counter (PC)
16
Which register stores the ADDRESS of the memory location being accessed?
Medium 2 Marks
MAR holds an address not data — think of it like a house number.
A Program Counter (PC)
B Accumulator (ACC)
C Memory Address Register (MAR)
D Instruction Register (IR)
17
What happens during the Fetch stage of the Instruction Cycle?
Medium 2 Marks
Fetch means retrieve — which register points to where the instruction is?
A The CPU performs the required arithmetic or logical operation
B The control unit analyses the instruction to determine what to do
C The CPU retrieves the next instruction from main memory using the Program Counter
D The result is stored in a register or memory location
18
Which register provides the memory address during the Fetch stage?
Medium 2 Marks
The PC always points to the next instruction — it guides the fetch.
A Accumulator (ACC)
B Instruction Register (IR)
C Memory Data Register (MDR)
D Program Counter (PC)
19
Where is the fetched instruction placed after the Fetch stage?
Medium 2 Marks
The IR holds the instruction currently being processed.
A Accumulator (ACC)
B Instruction Register (IR)
C Memory Address Register (MAR)
D Program Counter (PC)
20
What happens during the Decode stage of the Instruction Cycle?
Medium 2 Marks
Decode means understand — the CU reads the instruction and decides what to do.
A The CPU fetches the instruction from memory
B The result is stored back in memory
C The control unit analyses the instruction to determine what operation must be performed
D The ALU performs arithmetic calculations
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