Pearson Edexcel GCSE (9-1) · Computer Science (1CP2)

Constructs: Practice Questions

5 multiple-choice questions marked as you go, and 4 written questions with worked solutions. All on Constructs.

9 questions23 marksFree, no account

Question 1

1 mark

Which programming construct is used to repeat a block of code a specific number of times?

Question 2

1 mark

Consider the following pseudocode snippet:

x = 10 y = 5 IF x > y THEN x = x - y ELSE y = y - x ENDIF

Which programming construct is demonstrated by the IF statement?

Question 3

1 mark

Which of the following is a characteristic of a subprogram (procedure or function) that uses a single entry point and a single exit point?

Question 4

1 mark

Which programming construct is used to execute a set of instructions multiple times until a specific condition is no longer met?

Question 5

1 mark

In a high-level programming language, which of the following best describes the use of a local variable within a subprogram?

Question 6

2 marks

Identify the programming construct used to execute a block of code only if a specific condition is met.

Write your answer out first, then check it against the worked solution.

Question 7

4 marks

Describe the difference between a count-controlled loop and a condition-controlled loop.

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Question 8

6 marks

Explain the benefit of using local variables within a subprogram instead of global variables.

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Question 9

6 marks

A algorithm is designed to calculate the factorial of a number \(n\) (written as \(n!\)).

(a) Use pseudocode to write a count-controlled loop that calculates \(5!\) and stores it in a variable result.
(b) Explain why a condition-controlled loop (like a WHILE loop) might be used instead if the user was providing the input value.
(c) How would you modify the algorithm to ensure it doesn't crash if the user enters a negative number?

Write your answer out first, then check it against the worked solution.

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