Lesson T3.1.2

T3.1.2 Boolean logic in circuits and programming Quiz: KS3 Computing, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T3.1.2, Boolean logic in circuits and programming: 20 multiple choice questions for the KS3 Computing (National Curriculum), Unit 3: Boolean logic and binary, written with Revision Ninja.

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The 20 questions

  1. What is a logic gate?

    • A storage drive
    • A power supply
    • An input device
    • A circuit component

  2. Which logic gate outputs 1 only when both of its inputs are 1?

    • NOT gate
    • Buffer gate
    • OR gate
    • AND gate

  3. Which logic gate has only one input?

    • NOT gate
    • AND gate
    • OR gate
    • Adder gate

  4. A circuit lights a lamp only when switch A AND switch B are both on. Which gate is used?

    • NOT gate
    • AND gate
    • OR gate
    • Half-adder gate

  5. Which gate is used if an alarm sounds when a door OR window sensor triggers?

    • AND gate
    • OR gate
    • NOT gate
    • NAND gate

  6. A heater should switch off when the room is NOT cold. Which gate performs the inversion?

    • NOT gate
    • OR gate
    • AND gate
    • Clock gate

  7. Which keyword starts a conditional decision in Python programming?

    • for
    • def
    • if
    • while

  8. What does the Python check 'temp > 20 and not raining' require?

    • Only temp true
    • Both conditions true
    • Either condition true
    • Neither condition true

  9. A pupil needs a gate that outputs 0 only when both inputs are 0. Which gate is this?

    • NOT gate
    • OR gate
    • Clock gate
    • AND gate

  10. Why are logic gates used in computer hardware?

    • To store files
    • To process binary
    • To amplify sound
    • To display colour

  11. What is the primary action of a NOT gate placed before an AND gate?

    • Adding two signals
    • Deleting the output
    • Reversing one input
    • Doubling the voltage

  12. Which Python operator reverses a Boolean value?

    • and
    • or
    • not
    • print

  13. A sensor sends 1 when a shop door is open. Which expression is 1 when the door is closed?

    • door_open AND door_open
    • door_open OR door_open
    • print(door_open)
    • NOT door_open

  14. Which keyword should replace 'or' to require both conditions in 'if a or b:'?

    • and
    • if
    • not
    • then

  15. What is the output of an AND gate when its inputs are 1 and 0?

    • 1
    • 10
    • 2
    • 0

  16. What is the output of an OR gate when its inputs are 0 and 0?

    • 00
    • 2
    • 0
    • 1

  17. Which hardware element combines signals from two sensors to trigger a buzzer?

    • A logic gate
    • A resistor
    • A register
    • A capacitor

  18. A pupil uses NOT on a condition that is already False. What is the result?

    • True
    • 0.5
    • False
    • An error

  19. What common foundation do both digital circuits and computer programs share?

    • String arrays
    • Decimal numbers
    • Analogue waves
    • True or false

  20. What is the output of an AND gate when both of its inputs are 0?

    • 1
    • 0
    • 00
    • 2

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