Lesson T1.2.2

T1.2.2 Energy values of food Quiz: KS3 Physics, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T1.2.2, Energy values of food: 20 multiple choice questions for the KS3 Physics (National Curriculum), Unit 1: Energy, written with Revision Ninja.

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The 20 questions

  1. What unit is used for energy on food labels?

    • Kilograms (kg)
    • Kilojoules (kJ)
    • Newtons (N)
    • Watts (W)

  2. Food A has 1500 kJ per 100 g and food B has 600 kJ per 100 g. Which gives more energy per 100 g?

    • They give the same energy
    • Neither gives any energy
    • Food B
    • Food A

  3. Which nutrient provides the most energy per gram?

    • Carbohydrate
    • Fibre
    • Fat
    • Protein

  4. Roughly how much energy does 1 g of fat provide?

    • 100 kJ
    • 37 kJ
    • 4 kJ
    • 17 kJ

  5. A 25 g portion of a food has 400 kJ per 100 g. How much energy is in the portion?

    • 100 kJ
    • 25 kJ
    • 1600 kJ
    • 400 kJ

  6. Why are food energy values often given per 100 g as well as per portion?

    • They show the weight of the packaging so shoppers can judge the waste
    • They show the price of the food in each shop so shoppers can compare costs
    • They allow fair comparison between products with different portion sizes
    • They show how long the food lasts before it goes off in the cupboard

  7. A snack bar has 200 kJ per bar and a fruit portion has 200 kJ. Which statement is true?

    • Both provide the same amount of energy
    • The fruit portion provides more energy
    • Neither provides any energy
    • The snack bar provides more energy

  8. Why does the body need energy from food?

    • To power movement, growth and keeping body temperature steady
    • To stop the body from losing heat at all, so that it never feels cold
    • To keep the total mass of the body constant, which stops it gaining weight
    • To make the body produce new mass from nothing, which is needed for growth

  9. Which nutrient is mainly needed for growth and repair of body tissues?

    • Protein
    • Fibre
    • Starch
    • Sugar

  10. Which food group provides the body's main short-term energy source?

    • Water, which is needed to keep the body hydrated and to help digestion
    • Minerals, which help build bones and teeth and keep the blood healthy
    • Carbohydrates
    • Vitamins, which help the body's cells work and protect against some illnesses

  11. A food label says 1000 kJ per 100 g. A 250 g portion is eaten. How much energy is eaten?

    • 1000 kJ
    • 4000 kJ
    • 250 kJ
    • 2500 kJ

  12. Why might an athlete eat carbohydrate-rich food before exercise?

    • It releases energy quickly for the muscles
    • It removes the need for water
    • It makes the body store more fibre
    • It stops the muscles from producing any heat

  13. Why does fibre contribute little energy to the body?

    • The body cannot digest it to release much energy
    • It is mostly water, so it adds little more than fluid to the body's stores
    • It is destroyed in the stomach, so it cannot pass into the blood at all
    • It is stored as fat in the body, where it is kept for later energy use

  14. A protein-rich food has about 17 kJ per gram. How much energy is in 10 g?

    • 17 kJ
    • 37 kJ
    • 1700 kJ
    • 170 kJ

  15. A food has 2000 kJ per 100 g. How much energy is in 10 g?

    • 2000 kJ
    • 20 000 kJ
    • 20 kJ
    • 200 kJ

  16. A food contains 40 g of fat, 50 g of carbohydrate and 10 g of protein. Using 37 kJ per gram for fat and 17 kJ per gram for carbohydrate and protein, what is the total energy?

    • 3000 kJ
    • 1480 kJ
    • 2500 kJ
    • 2100 kJ

  17. A cereal bar has 600 kJ per 100 g. How much energy is in a 60 g bar?

    • 600 kJ
    • 180 kJ
    • 360 kJ
    • 1200 kJ

  18. Where is energy from food mainly released in the body?

    • Inside cells, through respiration
    • In the stomach by chewing
    • In the skin as it absorbs sunlight
    • In the blood as it flows

  19. When the body takes in more energy than it uses, where is the extra energy mainly stored?

    • As water
    • As fibre
    • As fat
    • As vitamins

  20. Which statement about energy values on food labels is correct?

    • They tell you how many calories the food costs to buy in the shops
    • They show the energy used to cook the food, so cooking can be measured
    • They tell you how much energy a food provides for a given amount
    • They show how much sunlight the food absorbed while it was growing in the field

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