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 on a label?

    • Kilojoules (kJ)
    • Litres (l), which are used to measure the volume of liquids
    • Newtons (N), which are used to measure force in the physics lab
    • Metres (m), which are used to measure the length of the table

  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?

    • Drinking more water each day, which has no effect on energy needs
    • Eating more vitamins, which do not provide any energy to the body
    • Sleeping for longer each night, which lowers the body's energy use
    • Doing more physical activity

  6. Which of these people would generally need the most energy per day?

    • A baby asleep for most of the day
    • A person resting in bed
    • An adult sitting at a desk all day
    • A young athlete training for hours

  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 rather than joules?

    • Food contains large amounts of energy, so kilojoules are more convenient
    • Kilojoules are smaller units than joules, so they are used for small amounts
    • Joules are only ever used to measure electricity, never food energy values
    • Food energy is measured in newtons, which is the standard unit of force in science

  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. A person needs 8000 kJ per day but their food provides 9500 kJ. What does this show?

    • The person has taken in less energy than they need
    • The person's energy intake is exactly balanced
    • The person has taken in more energy than they need
    • Energy cannot be compared in this way

  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 per day. How much energy do they need over a whole week?

    • 630 kJ, which is the total energy needed over ten days of activity
    • 9000 kJ, which is the energy needed for just one single day of activity
    • 900 kJ, which is the energy needed for only a tenth of the day
    • 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 would NOT directly change a person's daily energy requirement?

    • Activity level, which changes how much energy the body uses each day
    • The colour of the food packet
    • Age, which changes how fast the body grows and how much it needs
    • Body size, which changes how much energy the body needs for work

  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. Why is it useful to compare food energy values with daily energy requirements?

    • It shows which food tastes the best and which one is most enjoyable to eat
    • It shows how many bones a person has, which helps them plan balanced meals
    • It tells how much vitamin each food has, which is the most important measure
    • It helps people choose a diet that matches the energy they need

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