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2024 AQA GCSE COMPUTER SCIENCE 8525/1C Paper 1
Computational thinking and programming skills – VB.NET
Verified Question Paper with Marking Scheme Combined.
June 2024
Materials
- There are no additional materials required for this paper.
- You must not use a calculator.
Instructions
- Use black ink or black ball-point pen. Use pencil only for drawing.
- Answer all questions.
- You must answer the questions in the spaces provided.
- If you need extra space for your answer(s), use the lined pages at the end of this
book. Write the question number against your answer(s).
- Do all rough work in this book. Cross through any work you do not want to be
marked.
- Questions that require a coded solution must be answered in VB.NET.
- You should assume that all indexing in code starts at 0 unless stated otherwise.
Information
The total number of marks available for this paper is 90.
Advice
For Examiner’s Use
Question Mark
1
2 – 3
4 – 5
6 – 7
8 – 9
10 – 11
12
13 – 14
15
TOTAL
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Answer all questions. box
Figure 1 shows an algorithm, represented using pseudo-code.
The algorithm assigns different values to two variables, then asks the user to input a
letter.
Figure 1
film "Godzilla vs. Kong"
year 2021
OUTPUT "Please guess a letter"
letter USERINPUT
Which pseudo-code statement assigns the length of the string filmto a variable called value?
Shade one lozenge.
[1 mark]
A film LEN(value)
B film film + value
C value film
D value LEN(film)
The POSITIONsubroutine returns the position of the first occurrence of a character in a
string.
For example:
- POSITION("Godzilla vs. Kong", "o")would return 1
- POSITION("Godzilla vs. Kong", "z")would return 3 letterand filmare
variables used in the algorithm in Figure 1.
Complete the pseudo-code statement to find the position of the first occurrence of the
contents of letterin filmand store this position in the variable location
You must use the POSITIONsubroutine in your answer.
[1 mark]
location
Do not write
outside the Turn over ►
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Write a VB.NET program that:
- gets the user to enter the name of a film
- displays You entered followed by the name of the film entered by the user.
The output from the program must be on one line.
You should use meaningful variable name(s) and VB.NET syntax in your answer.
The answer grid below contains vertical lines to help you indent your code
accurately.
[2 marks]
Do not write
outside the
Turn over ►
Do not write
outside the
Figure 2 shows an algorithm, represented using pseudo-code.
- Line numbers are included but are not part of the algorithm.
Figure 2
1 num USERINPUT
2 IF NOT(num > 1) OR num > 20 THEN
3 OUTPUT "False"
4 ELSEIF num > 1 AND num < 15 THEN
5 OUTPUT "Almost"
6 ELSEIF num MOD 5 = 0 THEN
7 OUTPUT "True"
8 ELSE
9 OUTPUT "Unknown"
10 ENDIF
The modulus operator is used to calculate the remainder after dividing one integer by
another.
For example:
- 14 MOD 3 evaluates to 2
- 24 MOD 5 evaluates to 4
box
. Where is a relational operator first used in the algorithm in Figure 2? Shade
one lozenge.
[1 mark]
A Line number 1
B Line number 2
C Line number 3
D Line number 6
Do not write
outside the Turn over ►
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outside the
Figure 3 shows an incomplete VB.NET program for a number guessing game.
- Line numbers are included but are not part of the program.
Figure 3
box
1 Dim rGen As New Random()
2 Dim randomNumber As Integer
4 Console.WriteLine("Enter a number")
5 Dim userNumber As Integer = Console.ReadLine()
6 While userNumber < 1 Or userNumber > 100
Console.WriteLine("Invalid number")
userNumber = Console.ReadLine()
End While
Console.WriteLine("Valid number entered")
If randomNumber = userNumber Then
Console.WriteLine("Number guessed correctly")
13 End If
. 1 The program should generate a random number between 1 and 100 (including 1 and 100).
This will be the number the user has to guess.
Write the VB.NET code that should be used on line 3 in Figure 3 to:
- generate a random number between 1 and 100 inclusive
- assign this number to the appropriate variable from the program.
You must use rGen.Next(a, b)in your VB.NET code.
rGen.Next(a, b)generates a random integer in the range ato bstarting at a
but finishing one before b
[2 marks]
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[1 mark]
box
State the name for the process of breaking a problem down into sub-problems.
[1 mark]
Define the term abstraction.
Do not write
outside the
box 0 6 A university is writing a program to calculate a student’s total mark for three essays.
If any essays are handed in late, the total mark is reduced.
Write a VB.NET program to calculate the total mark.
You should assume there are three integer variables called e1, e2 and e3 which
have already been given values to represent the marks of the three essays.
The program should:
- get the user to enter the number of essays handed in late and store the number in a
variable
- calculate the total mark for the three essays
o if only one essay is handed in late, the total mark is reduced by 10
o if more than one essay is handed in late, the total mark should be halved
o the total mark should not be less than 0
You should use meaningful variable name(s) and VB.NET syntax in your answer.
The answer grid below contains vertical lines to help you indent your code.
[7 marks]
Do not write
outside the
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Turn over for the next question
Turn over ►
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box
Turn over for the next question
Turn over ►
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Figure 6 shows an algorithm, represented using pseudo-code.
Figure 6
days [10, 15, 4]
sales [20, 33, 12]
weeks [0, 0, 0]
FOR i 0 TO 2
daysTotal days[i] + sales[i]
weeks[i] daysTotal DIV 7
ENDFOR
weeksTotal weeks[0] + weeks[1] + weeks[2]
OUTPUT weeksTotal
The DIV operator is used for integer division.
Complete the trace table for the algorithm in Figure 6.
Part of the table has already been filled in.
You may not need to use all the rows in the table.
[6 marks]
box
i daysTotal
weeks
weeksTotal
[0] [1] [2]
