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 provides more energy?

    • Both are equal
    • Neither provides 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 do food labels give energy values per 100 g?

    • Exact weight
    • Portion size
    • Fair comparison
    • Total calories

  7. A snack bar and a fruit portion each provide 200 kJ. What is true?

    • Equal energy
    • Equal sugar
    • Equal volume
    • Equal mass

  8. What is the primary reason the human body needs energy from food?

    • Movement, growth and warmth
    • Cooling the skin
    • Breathing pure oxygen
    • Digesting water molecules

  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?

    • Minerals
    • Vitamins
    • Carbohydrates
    • Proteins

  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 do athletes eat carbohydrate-rich foods before exercise?

    • Fast energy
    • Water storage
    • Bone strength
    • Muscle growth

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

    • Cannot be digested
    • Absorbed too quickly
    • Destroyed by stomach acid
    • Contains no carbon

  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. In which part of the body is energy from food mainly released?

    • Inside cells
    • In the stomach
    • In the liver
    • In the bloodstream

  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. What do energy values on food packaging typically show?

    • Total packet mass
    • Maximum storage time
    • Energy per specified amount
    • Protein to fat ratio

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