AQA-7516-1-COMPUTER SCIENCE QUESTION PAPER 1-AS LEVEL-14May2024.

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AQA
AS
COMPUTER SCIENCE
Paper 1


Tuesday 14 May 2024 Afternoon Time allowed: 1 hour 45 minutes




E
C
Materials
For this paper you must have:
• a computer




N
• a printer
• appropriate software




IE
• the Electronic Answer Document
• an electronic version and a hard copy of the Skeleton Program
SC
• an electronic version and a hard copy of the Preliminary Material
• an electronic version of the Data File SimulationData.txt
You must not use a calculator.

Instructions
R

• Type the information required on the front of your Electronic Answer Document.
• Before the start of the examination make sure your Centre Number, Candidate Name and
TE


Candidate Number are shown clearly in the footer of every page (not the front cover) of your
Electronic Answer Document.
• Enter your answers into the Electronic Answer Document.
• Answer all questions.
PU




• Save your work at regular intervals.

Information
•
M




The marks for questions are shown in brackets.
• The maximum mark for this paper is 75.
• No extra time is allowed for printing and collating.
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• The question paper is divided into three sections.
C




Advice
You are advised to allocate time to each section as follows:
Section A – 20 minutes; Section B – 25 minutes; Section C – 60 minutes.

At the end of the examination
Tie together all your printed Electronic Answer Document pages and hand them to the Invigilator.

Warning
It may not be possible to issue a result for this paper if your details are not on every page of your
Electronic Answer Document.




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Section A

You are advised to spend no more than 20 minutes on this section.

Enter your answers to Section A in your Electronic Answer Document. You must save this
document at regular intervals.

Question 04 in this section asks you to write program code starting from a new
program/project/file.

You are advised to save your program at regular intervals.


0 1 Figure 1




E
S1 ← "011101"




C
S2 ← "001100"
C ← "0"




N
R ← ""
FOR J = 0 TO 5




IE
X ← 5 - J
D1 ← S1[X]
SC
D2 ← S2[X]
IF C = "0" THEN
IF D1 = D2 THEN
S ← "0"
R

C ← D1
ELSE
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S ← "1"
ENDIF
ELSE
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IF D1 = D2 THEN
S ← "1"
C ← D1
ELSE
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S ← "0"
ENDIF
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ENDIF
R ← CONCATENATE(S, R)
C




ENDFOR
OUTPUT R

The function CONCATENATE(X, Y) returns the string formed by concatenating the
string Y to the end of string X. For example, CONCATENATE("cat", "dog")
returns "catdog".

The strings are zero index based.




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3


Complete Table 1 by hand-tracing the algorithm in Figure 1.

You may not need to use all the rows in Table 1.

You do not need to indicate that C, D1, D2 and S are strings.

The first row of Table 1 has already been completed for you.


Table 1



S1 S2 C R J X D1 D2 S




E
"011101" "001100" "0" ""




C
N
IE
SC
R
TE
PU
M




OUTPUT:
O
C




Copy the contents of all the unshaded cells in Table 1 into your Electronic
Answer Document.
[5 marks]




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