O-LevelComputer ScienceHardware2210/13 · Oct/Nov 2023 · Q37 Marks

A computer has a central processing unit (CPU).

(a)Circle three components that are built into the CPU. accumulator (ACC) control unit (CU) graphics card hard disk drive (HDD) motherboard program counter (PC) random access memory (RAM) read only memory (ROM)[3]
(b)The CPU has cache. Explain the purpose of the cache.[2]
(c)The CPU has a component that regulates the number of fetch-decode-execute cycles the CPU can perform in a second. State the name of this component.[1]
(d)The CPU has a component that carries out all calculations and logical operations. State the name of this component.[1]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2023). The mark or mark type is shown in brackets.

[3] (a) Accumulator (ACC), Control unit (CU), Program counter (PC)
[2] (b) Any two from: It is a type of storage, ...that stores frequently used data/instructions, To speed up access, as it is faster to access than RAM, It has different levels e.g. L1 - L3
[1] (c) Clock
[1] (d) Arithmetic logic unit // ALU

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Topic: Hardware, O-Level Computer Science (syllabus 2210). Structured question, 7 marks.
Source: O-Level Computer Science, Oct/Nov 2023 Paper 1 Variant 3, question 3.

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