2017_com_science_alevel_nov_paper1

Extracted Content: 2017_com_science_alevel_nov_paper1

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General Certificate of Education Advanced Level

COMPUTING 9195/1

PAPER 1: Structured Theory

NOVEMBER 2017 SESSION 3 hours
Additional materials:
Answer paper
Non-programmable electronic calculator

TIME 3 hours

INSTRUCTIONS TO CANDIDATES

Write your name, centre number and candidate number in the spaces provided on the answer
paper/answer booklet.

Answer all questions.

Write your answers on the separate answer paper provided.

If you use more than one sheet of paper, fasten the sheets together.
INFORMATION FOR CANDIDATES
The number of marks is given in brackets [ ] at the end of each question or part question.

You are reminded of the need for good English and clear presentation in your answers.

This question paper consists of 4 printed pages.

Copyright: Zimbabwe School Examinations Council, N2017.
©ZIMSEC N2017 [Turn over

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(b)
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State the functions of the following computer components:

(i) Processor

(ii) Main memory

(iii) | Secondary storage

Define a register in computing context.

Identify any five general application areas of computers.

(i) Explain how it is possible to protect computer data from
Us physical damage
2. theft and misuse.

(ii) Discuss the techniques that can be used to prevent unauthorised access
to computer systems.

Explain any four functions of a computer operating system.

@ Define serial data transmission.

(ii) Explain the difference between serial and parallel data transmission.

(iii) Identify the circumstance where it would be appropriate to use
parallel data transmission.

(iv) _ Justify the need for protocols in data communication.

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(b)
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Give any two differences between dynamic and static data structures.

The following data items are to be entered into a binary search tree in the
order given:

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Harare, London, Paris, Rome, Berlin, Amsterdam, Lisbon, Madrid, Lilongwe.

i) Draw a diagram to show how these values (data items) will be stored
and circle the roof node.

(ii) _ If Madrid is being searched for in this binary tree, list the data items
which will have to be accessed.

Perform the following arithmetic:

(i) 100000002 - 1001100,

(ii) A73+B412+52D

Convert the hexadecimal number ABCD to Octal.
Represent 101010. using BCD.

Describe the following terms in computing:

@ system software

(ii) antivirus

(iii) disk formatting

(iv) defragmentation

(v) file compression
Translators are essential in computing.

Give the differences in the way in which the three main translators translate
data.

Compiling is done in a number of stages.

Outline what happens at each stage of compilation, in the correct sequence.

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