Lesson T1.3.2

T1.3.2 Energy requirements in a daily diet Quiz: KS3 Biology, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T1.3.2, Energy requirements in a daily diet: 20 multiple choice questions for the KS3 Biology (National Curriculum), Unit 1: Structure and function of living organisms, written with Revision Ninja.

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The 20 questions

  1. What unit is used to show the energy content of food?

    • Kilojoules
    • Kelvin
    • Kilograms
    • Kilometres

  2. A daily energy requirement is 8400 kJ. A breakfast provides 1680 kJ. What fraction of the day's energy does breakfast provide?

    • One third
    • One fifth
    • One tenth
    • One quarter

  3. A snack provides 500 kJ and a lunch provides 2100 kJ. What is the total energy from the two?

    • 2600 kJ
    • 2700 kJ
    • 1600 kJ
    • 2000 kJ

  4. A student needs 9000 kJ per day and has eaten 6300 kJ so far. How much more energy is needed?

    • 2700 kJ
    • 3700 kJ
    • 2500 kJ
    • 3000 kJ

  5. Which factor increases a person's daily energy requirement the most?

    • Reading a book
    • Watching television
    • Sleeping longer
    • Physical activity

  6. Which person generally needs the most energy per day?

    • A sleeping toddler
    • An inactive adult
    • An elderly person
    • A young athlete

  7. A food label gives 2000 kJ per 100 g. How much energy is in a 250 g portion?

    • 5000 kJ
    • 800 kJ
    • 2250 kJ
    • 500 kJ

  8. A man needs 10 500 kJ per day and a woman needs 8400 kJ per day. What is the difference between their needs?

    • 1900 kJ
    • 2400 kJ
    • 2100 kJ
    • 1800 kJ

  9. Why is food energy measured in kilojoules instead of joules?

    • Food contains large amounts
    • Kilojoules are more accurate
    • Joules are outdated units
    • Joules measure heat only

  10. Which of these units measures power rather than energy?

    • Watt
    • Joule
    • Newton
    • Kilojoule

  11. A kettle has a power rating of 2 kW and runs for 1 hour. How much energy does it use?

    • 20 kWh
    • 0.5 kWh
    • 120 kWh
    • 2 kWh

  12. A meal label shows 1200 kJ per portion. A person eats 3 portions. What is the total energy?

    • 3600 kJ
    • 1200 kJ
    • 3200 kJ
    • 4000 kJ

  13. What does a daily intake of 9500 kJ indicate when energy need is 8000 kJ?

    • An energy deficit
    • Balanced daily energy
    • An energy surplus
    • Complete energy depletion

  14. Which conversion is correct: 1 kJ is equal to how many joules?

    • 1000 J
    • 100 J
    • 10 000 J
    • 10 J

  15. A teenager needs 9000 kJ daily. How much energy do they need in a week?

    • 90 000 kJ
    • 9 000 kJ
    • 18 000 kJ
    • 63 000 kJ

  16. A food provides 450 kJ in a 50 g portion. How much energy is there per gram?

    • 9 kJ per gram
    • 0.9 kJ per gram
    • 4.5 kJ per gram
    • 90 kJ per gram

  17. Which factor does NOT directly affect a person's daily energy requirement?

    • Age
    • Food packet colour
    • Activity level
    • Body mass

  18. Two portions of 350 kJ each and one portion of 175 kJ are eaten. What is the total energy?

    • 1050 kJ
    • 525 kJ
    • 700 kJ
    • 875 kJ

  19. A person eats 6000 kJ in a day but needs 7500 kJ. What is the energy deficit?

    • 1000 kJ
    • 1500 kJ
    • 2500 kJ
    • 13 500 kJ

  20. What is the main benefit of comparing food energy values with daily requirements?

    • Increases body mass
    • Removes excess water
    • Speeds up digestion
    • Matches energy needs

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