Computing Survivor — 1.1.2 CPU Performance
OCR J277 1.1.2 GCSE Computer Science revision quiz
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Quiz Questions & Answers
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Question 1: Which factor describes how many instruction cycles a CPU completes per second?
Cache size
Clock speed
Number of cores
Word length
Question 2: A CPU's clock speed is increased from 2 GHz to 4 GHz. What is the likely effect?
It processes roughly twice as many instructions per second
It doubles the number of cores
It reduces power consumption
It increases the cache size automatically
Question 3: What is the purpose of cache memory in a CPU?
To store the operating system permanently
To hold frequently used data close to the CPU for faster access
To increase the clock speed
To provide additional secondary storage
Question 4: How does increasing the number of cores improve CPU performance?
Each core runs at a higher clock speed
It increases the size of the cache
Multiple cores can process different tasks simultaneously
It reduces the amount of RAM needed
Question 5: A student says: 'A larger cache always makes a CPU faster than a higher clock speed.' Is this correct?
Yes — cache size is always the most important factor
No — all three factors (clock speed, cache, cores) affect performance and interact with each other
Yes — cache stores more programs so the CPU never waits
No — only clock speed matters for performance