What will happen if there is a bug in Ellie’s program?

The program will not work properly

The program will work all the time

Ellie thinks she has found a bug in her program. The program is to make a toy robot stop when it gets to a wall. This is the bug:ForwardWall?Yes - ForwardNo - StopEllie corrects the code. What does she write?

Forward Wall? Yes - Back No - Stop

Forward Wall? Yes - Forward No - Back

Forward Wall? Yes - Stop No - Forward

Forward Wall? Yes - Back No - Forward

Freddy is designing toy traffic lights. He programs a toy car to stop when the lights are red and go when the lights are green. He writes this program:GoIf Red, GoIf Green, GoFreddy tests his program. But the car does not stop at a red light. Can you help Freddy debug his program? What should Freddy code?

Stop - If Red, Go - If Green, Go

Stop - If Red, Stop - If Green, Stop

Go - If Red, Stop - If Green, Go

Go - If Red, Stop - If Green, Stop

KS1Computing★★ Medium

KS1 Computing Debugging Quiz

The debugging cycle is needed if a computer program doesn't work. This involves making sure the code you have written is correct and making any changes necessa…

Written by Dr. Emma ClarkeReviewed by Dr. Emma ClarkeUpdated 17 Mar 2026

Quizzes and Guides KS1 Computing

Overview

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Quiz details

Topic: Debugging

Questions: 10

Duration: 10 min

Difficulty: ★★ Medium

Focus: applying Debugging with consistent method and answer precision.

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Description

The debugging cycle is needed if a computer program doesn't work. This involves making sure the code you have written is correct and making any changes necessary before testing again. Learn more about code and bugs in this enjoyable and informative KS1 Computing quiz for year 1 and year 2 students.

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Quiz FAQ

How should I use this KS1 Computing Debugging Quiz?

Complete the quiz once under normal timing, review every mistake, then return to the Computing subject page to try a related quiz while the topic is still fresh.

What should I do after finishing this KS1 Computing Debugging Quiz?

Use your score as a signal. If the result is strong, move to another Computing quiz for wider coverage. If the result is weak, repeat practice in the same subject before switching topics.

Is KS1 Computing Debugging Quiz enough on its own for Computing revision?

One quiz is useful for diagnosis, but not enough on its own. The strongest approach is to combine this page with other quizzes in Computing, plus broader revision or past-paper style practice where available.