Fundamentals of Computer Organisation Practice Questions
A-Levels · A-Level Computer Science · 149 free MCQs with instant results and detailed explanations.
149
Total
46
Easy
76
Medium
27
Hard
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Sample Questions from Fundamentals of Computer Organisation
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Q1
Easy
Which of the following is the primary function of the CPU in a computer system?
A.
Storing data permanently
B.
Executing instructions
C.
Providing network connectivity
D.
Rendering graphics
Show Answer & Explanation
Correct Answer: B
The primary function of the CPU (Central Processing Unit) is to execute instructions from programs. It performs calculations, logic operations, and manages data flow between components.
Q2
Easy
In a computer, the memory hierarchy is designed to optimize which of the following?
A.
Cost effectiveness
B.
Power consumption
C.
Access speed
D.
Data redundancy
Show Answer & Explanation
Correct Answer: C
The memory hierarchy is structured to provide quick access to data. Faster memory types, like cache, are used to minimize the time it takes for the CPU to access frequently used data.
Q3
Easy
Which component is responsible for the temporary storage of data during processing in a computer?
A.
Hard Disk Drive
B.
RAM
C.
ROM
D.
Power Supply Unit
Show Answer & Explanation
Correct Answer: B
RAM (Random Access Memory) is used for temporary storage of data that the CPU actively uses during processing. It allows quick read and write access to data.
Q4
Medium
Which of the following best describes the function of the ALU in a CPU?
A.
It performs arithmetic and logical operations.
B.
It stores data temporarily during processing.
C.
It fetches instructions from memory.
D.
It manages input and output devices.
Show Answer & Explanation
Correct Answer: A
The ALU (Arithmetic Logic Unit) is responsible for performing all arithmetic and logical operations within the CPU, making it crucial for processing data.
Q5
Medium
In a computer system, which component is primarily responsible for coordinating all activities?
A.
Cache Memory
B.
Central Processing Unit (CPU)
C.
Random Access Memory (RAM)
D.
Secondary Storage
Show Answer & Explanation
Correct Answer: B
The CPU is known as the brain of the computer, coordinating all activities by processing instructions and managing data flow between other components.
Q6
Medium
What is the primary purpose of a system bus in computer architecture?
A.
To provide power to the CPU.
B.
To connect the CPU with peripheral devices.
C.
To transfer data between components.
D.
To store system software.
Show Answer & Explanation
Correct Answer: C
The system bus is a communication pathway that transfers data between various components of the computer, ensuring they can work together effectively.
Q7
Medium
If a CPU has a clock speed of 3 GHz, how many cycles does it execute in one second?
A.
3 million cycles
B.
3 billion cycles
C.
300 thousand cycles
D.
30 billion cycles
Show Answer & Explanation
Correct Answer: B
A clock speed of 3 GHz means the CPU performs 3 billion cycles per second, indicating its processing capability.
Q8
Hard
In a computer system, the performance of the CPU can be affected by the cache memory architecture. What is the primary benefit of having multiple levels of cache (L1, L2, L3) in a CPU architecture?
A.
Reduces the complexity of the CPU design.
B.
Increases the frequency of the CPU clock cycle.
C.
Minimizes the average time to access data from memory.
D.
Decreases the power consumption of the CPU.
Show Answer & Explanation
Correct Answer: C
Having multiple levels of cache minimizes the average time to access data. The L1 cache is the fastest and closest to the CPU, while L2 and L3 caches are larger but slower. This hierarchy ensures that frequently accessed data is retrieved quickly, enhancing overall CPU performance.
Q9
Hard
Consider a 32-bit instruction set architecture that uses a fixed instruction size. If an instruction requires 8 bits for the opcode and 24 bits for the operand, how many unique instructions can be supported by this architecture?
A.
256
B.
65536
C.
16777216
D.
4294967296
Show Answer & Explanation
Correct Answer: C
With 8 bits allocated for the opcode, the number of unique opcodes is 2^8, which equals 256. However, the operand space is 24 bits, allowing for 2^24 unique combinations for each opcode, resulting in a total of 256 x 2^24 = 16777216 unique instructions.
Q10
Hard
Which of the following best describes the function of a memory management unit (MMU) in a computer system?
A.
It converts logical addresses to physical addresses and manages memory protection.
B.
It enhances CPU performance by overclocking the processor speed.
C.
It acts as an interface between the CPU and peripheral devices.
D.
It stores frequently accessed data to speed up processing.
Show Answer & Explanation
Correct Answer: A
The memory management unit (MMU) is responsible for translating logical addresses generated by the CPU into physical addresses in RAM. Additionally, it manages memory protection to prevent processes from interfering with each other's memory space.
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Fundamentals of Computer Organisation — A-Levels A-Level Computer Science Practice Questions Online
This page contains 149 practice MCQs for the chapter Fundamentals of Computer Organisation in A-Levels A-Level Computer Science. The questions are organized by difficulty — 46 easy, 76 medium, 27 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.