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GCSE OCR Computer Science J277 - Topic 2.2.2: Data Types Exam

Instructions

• This exam consists of 15 questions, including objective (e.g., short-answer, identification) and descriptive (e.g., code-writing, explanation) questions.
• Total marks: 50.
• Time allowed: 45 minutes.
• Answer all questions.
• Use OCR Exam Reference Language (pseudo-code) where code is required, unless specified otherwise.

Questions

Question 1 (2 marks) [Descriptive]

Define what a data type is and explain why it is important in programming.

Question 2 (1 mark) [Objective]

Name the five data types specified in the OCR J277 syllabus.

Question 3 (3 marks) [Objective]

Identify the data type for each of the following values:
a) 42 (1 mark)
b) "Hello" (1 mark)
c) TRUE (1 mark)

Question 4 (2 marks) [Descriptive]

Explain why an integer data type is more appropriate than a string for storing the number of students in a class.

Question 5 (4 marks) [Descriptive]

Write pseudo-code to:

• Declare a constant MAX_SCORE set to 100.
• Declare a variable name set to "Alice".
• Declare a variable passed set to TRUE.
• Output all three values.

Question 6 (4 marks) [Descriptive]

Write pseudo-code (Python code is also an option) to:

• Input a user’s age as a string.
• Cast it to an integer.
• Add 5 to the age.
• Output the result.

Question 7 (3 marks) [Objective]

What data type would you use for the following, and why?
a) A single letter grade (e.g., 'A'). (1 mark)
b) A person’s height in meters (e.g., 1.75). (1 mark)
c) A flag indicating if a game is over. (1 mark)

Question 8 (5 marks) [Descriptive]

Write pseudo-code for a program that:

• Inputs a test score as a string.
• Casts it to a real number.
• Checks if the score is at least 50.
• Sets a Boolean variable passed accordingly.
• Outputs the score and whether the student passed.

Question 9 (3 marks) [Objective]

What is the purpose of type casting in programming? Give an example in Python.

Question 10 (3 marks) [Objective]

What is the output of this Python code? Explain briefly.

x = "10"
y = int(x) * 2
print(y)

Question 11 (4 marks) [Descriptive]

Write pseudo-code (Python code is also an option) to input two numbers as strings, cast them to floats, calculate their average, and output the result.

Question 12 (3 marks) [Objective]

In the following pseudo-code, identify the data type of each variable:

price ← 19.99
quantity ← 5
description ← "Apples"

a) price (1 mark)
b) quantity (1 mark)
c) description (1 mark)

Question 13 (4 marks) [Descriptive]

Write pseudo-code to:

• Input a character representing a user’s response (e.g., 'Y' or 'N').
• Check if it is 'Y'.
• If true, output "Yes selected"; otherwise, output "No selected".

Question 14 (2 marks) [Descriptive]

Explain the difference between a character and a string data type, with examples.

Question 15 (5 marks) [Descriptive]

Write a pseudo-code (Python code is also an option) that:

• Inputs a user’s name (string) and score (cast to float).
• Sets a Boolean is_high to True if the score is above 75.
• Outputs a message like "[Name], your score is [score]. High score: [is_high]".

End of Question Paper