Time allowed: 30 minutes
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INSTRUCTIONS
- Use black ink.
- Answer all the questions.
INFORMATION
- The total mark for this paper is 20.
- The marks for each question are shown in brackets [ ].
Turn over
Section A: Recall & Definitions
1
Draw
one line from each part of the processor to its correct definition.
[3]
Part of the processor
Control Unit (CU)
Cache
Arithmetic Logic Unit (ALU)
Definition
Performs mathematical calculations and logical operations.
Sends signals to direct the operations of the processor.
High speed memory inside the processor that stores recently used instructions.
2
Tick
one box in each row to identify which component each statement describes.
[3]
| Statement |
ALU |
CU |
Cache |
| It sends control signals to coordinate components. |
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| It stores frequently used instructions. |
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| It performs subtraction. |
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Section B: Detailed Function
3
The Control Unit (CU) is a vital part of the CPU.
Describe
two distinct functions of the Control Unit.
[4]
Turn over
4
The Arithmetic Logic Unit (ALU) performs two types of operations.
Identify these two types of operations and give an example of each.
[4]
Type 1:
Example:
Type 2:
Example:
Section C: Performance & Application
5
A computer system has 2 MB of Cache memory.
Explain how the cache size affects the performance of the CPU.
[2]
6
Two computers have the following specifications:
- Computer A: 1 GHz Clock Speed, 2 MB Cache.
- Computer B: 1 GHz Clock Speed, 512 KB Cache.
(a) Identify which computer is likely to run faster.
[1]
(b) Explain
one reason for your choice in part (a).
[1]
7
A student claims: "The Cache is just extra RAM, so it does exactly the same job."
Explain why the student is incorrect.
[2]
END OF QUESTION PAPER