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Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. For the multiple-choice questions, completely fill in the lozenge alongside the appropriate answer. CORRECT METHOD WRONG METHODS If you want to change your answer you must cross out your original answer as shown. If you wish to return to an answer previously crossed out, ring the answer you now wish to select as shown.
AQA GCSE COMPUTER SCIENCE Paper 1 Computational thinking and programming skills
- Python (8525/1B) Combined Question Paper and Mark Scheme
GCSE
COMPUTER SCIENCE
Paper 1 Computational thinking and programming skills – Python
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 Python.
- 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 TOTAL
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Answer all questions. box
Figure 1 shows a program written in Python.
- Line numbers are included but are not part of the program.
Figure 1
# Python program
a = 1
b = 1
4 c = 5
5 while b < c:
6 a = a + a
7 b = b + 1
8 print(a)
Where is an arithmetic operation first used in the program in Figure 1?
Shade one lozenge.
A Line number 1
[1 mark]
B Line number 5
C Line number 6
D Line number 8
. Which of the following is a false statement about the program in Figure 1?
Shade one lozenge.
[1 mark]
A This program contains a comment.
B This program uses assignment.
C This program uses concatenation.
D This program uses iteration.
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A coffee shop has a loyalty scheme which rewards customers for buying drinks.
The customer gets one stamp on their loyalty card for each individual drink they buy.
- Every 4th stamp on the card gets the customer a free biscuit.
- Every 5th stamp on the card gets the customer a free pastry.
- When the customer reaches 20 stamps, they get a free cake (but no biscuit or
pastry).
The Python program shown in Figure 2 should display whether the customer gets a
free biscuit, pastry, cake or nothing free for their first 20 drinks.
For each drink purchased, the program must output either: "Free biscuit",
"Free pastry", "Free cake" or "Nothing free".
Some parts of the program have been replaced with the labels to.
Figure 2
i = 1
while i <= 20:
if i % 20 == 0:
print("Free cake")
elif :
print("Free pastry")
elif i % 4 == 0:
else:
i = i + 1
box
State the Python code that should be written in place of the labels in the program
written in Figure 2.
[3 marks]
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. The coffee shop wants to work out the total value of the free biscuits, pastries and
cakes given out each day.
- Each free biscuit is worth £
- Each free pastry is worth £2.
- Each free cake is worth £
Write a Python program to get the number of free biscuits, pastries and cakes, and
calculate the total value for the day.
Your program must:
- get the user to enter the number of free biscuits and store it in a variable
- get the user to enter the number of free pastries and store it in a variable
- get the user to enter the number of free cakes and store it in a variable
- calculate the total value of the free items
- output the total value of the free items.
You should use indentation as appropriate, meaningful variable name(s) and Python
syntax in your answer.
box
The answer grid below contains vertical lines to help you indent your code.
[4 marks]
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A programmer is developing a system to register users for an app. The program
needs to validate the first name of the user.
box
. Identify the purpose of validation.
Shade one lozenge.
A Checks that the user is human
[1 mark]
B Checks that the user is who they say they are
C Checks that the input is a name
D Checks that the input is reasonable
. Write a Python program to check the user’s first name.
Your program should:
- get the user’s first name
- check that the first name has more than one character and fewer than 15
characters:
o if it has, output the message Name accepted
o if it has not, output the message Name not accepted
- repeat until the name entered has a specified length.
You should use indentation as appropriate, meaningful variable name(s) and Python
syntax in your answer.
The answer grid below contains vertical lines to help you indent your code.
[6 marks]
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. Which of the following statements best describes boundary test data?
Shade one lozenge.
A Data that is not of the allowed data type
[1 mark]
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B Data that is at the limits of the allowed range
C Data that is expected by the program
D Data that will cause a syntax error
. The programmer has started planning the tests that will be used to check the program
is working correctly.
The program should:
- check that the first name has more than one character and fewer than 15
characters:
o if it has, then output the message Name accepted
o if it has not, then output the message Name not accepted
The start of the test plan is shown in Figure 3.
Figure 3
Test
number
Test data
Type of
test data
Expected result
Thomas
Normal
Name accepted
2 Boundary
Name not accepted
State the number of characters that a string used for test number 2 in Figure 3 could
contain.
[1 mark]
. Normal and boundary are two types of test data.
State one type of test data that has not been used in Figure 3.
[1 mark]
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. 6 A programmer is designing an algorithm to generate usernames for users.
The algorithm should:
- ask the user to input their first name and their last name
- create a username:
o if their first name has more than three characters, their username will consist of
the first three characters of their first name followed by their last name
o if their first name has three or fewer characters, their username will consist of
their full first name followed by their last name
Figure 4 contains the statements required to implement a version of this algorithm.
Figure 4
firstName USERINPUT
LEN (firstName) > 3
username firstName + lastName
OUTPUT username
username SUBSTRING (0, 2, firstName) + lastName
lastName USERINPUT
Using the labels ( to ) shown in Figure 4 , complete the flowchart to implement
the algorithm.
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[3 marks]
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The Python program in Figure 5 gets five numbers and outputs the sum of those
numbers.
Figure 5
num1 = int(input())
num2 = int(input())
num3 = int(input())
num4 = int(input())
num5 = int(input())
total = num1 + num2 + num3 + num4 + num
print(total)
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. An integer data type is used in the program in Figure 5.
Describe what is meant by a data type.
[1 mark]
The variables num1, num2, num3, num4 and num5 in Figure 5 have an
integer data type.
. Explain why these variables do not have a string data type.
[1 mark]
The program in Figure 5 needs to be changed to use numbers with a fractional part
(a real number).
State a data type in Python that should be used.
[1 mark]
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. Rewrite the program in Figure 5 so that it achieves the same result but uses an
iteration structure that contains only one input()statement.
Your answer must be written in Python.
You should use indentation as appropriate, meaningful variable name(s) and Python
syntax in your answer.
box
The answer grid below contains vertical lines to help you indent your code.
[5 marks]
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A programmer decides to use a merge sort algorithm to sort the same values shown
in Figure 6.
Complete the diagram to show how the merge part of the merge sort algorithm is
applied to Figure 6.
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[3 marks]
Question 6 continues on the next page
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. State one advantage and one disadvantage of a bubble sort compared to a merge
sort.
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[2 marks]
Advantage
Disadvantage
. The programmer has an array of 2500 numbers, stored in ascending order (smallest
to largest).
The programmer needs to write a program to search for a value in the array.
Explain why a binary search is better than a linear search for this array.
[2 marks]
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. 4 State the identifier for the parameter in Figure 7.
[1 mark]
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State two characteristics of the structured approach to programming.
[2 marks]
Turn over for the next question
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Figure 8 shows an algorithm represented using pseudo-code.
- Line numbers are included but are not part of the algorithm.
Figure 8
b1 '0010'
b2 '0111'
new ''
FOR i 0 TO LEN(b1) - 1
5 IF b1[i] = '1' OR b2[i] = '1' THEN
6 IF NOT (b1[i] = '1' AND b2[i] = '1') THEN
new new + '1'
8 ELSE
new new + '0'
10 ENDIF
11 ELSE
new new + '0'
13 ENDIF
14 ENDFOR
15 OUTPUT new
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. Complete the trace table for the algorithm shown in Figure 8.
You may not need to use all the rows in the table.
[5 marks]
b1 b2 new i
