Year 9 Computer Science Quiz

Instructions: Select the correct answer for each question. There are 20 multiple-choice questions. Click "Submit" to see your score.

1. What is an algorithm?

A set of instructions to solve a problem A type of computer hardware A programming language A data storage device

2. What is a truth table in logic circuits?

A diagram showing program flow A table listing all possible input combinations and outputs A list of variables A code snippet

3. What is a string data type?

A whole number A sequence of characters A decimal number A true/false value

4. What is a float data type?

A sequence of text An integer A number with decimal points A list of items

5. What is an array?

A single value A collection of values stored under one name A loop structure A decision statement

6. What is the main function of a computer's CPU?

To store data To execute instructions To print documents To connect devices

7. Which is an example of an output device?

Microphone Monitor Keyboard Mouse

8. What does firewall software primarily do?

Blocks unauthorized access Creates backups Edits photos Plays music

9. Which is an example of sensitive personal information?

A book title Your phone number A weather report A recipe

10. Why should you use strong passwords?

To make them easy to remember To secure accounts from hackers To speed up login To share with friends

11. In algorithms, what is 'sequence'?

Repeating steps Steps in order Making choices Assigning values

12. Which structure is used for decision-making in algorithms?

Iteration Sequence Selection Assignment

13. What is iteration in programming?

A one-time action Repeating code blocks Input from user Output to screen

14. Which logic gate outputs true only if both inputs are true?

OR NOT AND XOR

15. What is the symbol for a NOT gate?

A triangle with a circle at the output A curved gate A rectangle A diamond

16. In a truth table for OR gate, what is the output if both inputs are false?

True False Undefined Error

17. What would pseudocode for checking if a number is positive look like?

IF number > 0 THEN output "positive" LOOP number > 0 ASSIGN number = positive OUTPUT number

18. What is a compiler?

Translates code line by line Translates entire code at once to machine code Runs the program Edits code

19. In a program flowchart, what does a diamond shape represent?

Start/End Process Decision Input/Output

20. How do you access the first element in a Python list called myList?

myList(0) myList[1] myList[0] myList{0}