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Nuclear fission and fusion

11th grade (Year 12 in England) · 16 questions · Common Core: NGSS.HS-PS1-8, NGSS.HS-ESS1-1 · England: GCSE Physics: Atomic structure (nuclear fission and fusion)

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  1. Question 1

    Why is fusion so hard to achieve on Earth?

    • A. Nuclei repel each other, so extremely high temperatures and pressures are needed
    • B. There is no hydrogen on Earth
    • C. Fusion releases no energy
    • D. Fusion only works with uranium

  2. Question 2

    Fission or fusion: hydrogen nuclei join to form helium?

    • A. fission
    • B. fusion

  3. Question 3

    Fission and fusion: which statement is NOT true?

    • A. Fission products are usually radioactive.
    • B. Fusion splits large nuclei.
    • C. Both fission and fusion convert a small amount of mass into energy.
    • D. A nuclear reactor uses a moderator to slow neutrons down.

  4. Question 4

    How are control rods used in a fission reactor?

    • A. They absorb neutrons to control the rate of the chain reaction
    • B. They produce electricity directly
    • C. They speed up all the neutrons
    • D. They cool the steam

  5. Question 5

    Fission or fusion: hydrogen nuclei join to form helium?

    • A. fission
    • B. fusion

  6. Question 6

    Fission and fusion: which statement is NOT true?

    • A. A nuclear reactor uses a moderator to slow neutrons down.
    • B. Today's nuclear power stations use fusion.
    • C. Both fission and fusion convert a small amount of mass into energy.
    • D. Fusion releases energy in the Sun.

  7. Question 7

    How are control rods used in a fission reactor?

    • A. They absorb neutrons to control the rate of the chain reaction
    • B. They produce electricity directly
    • C. They cool the steam
    • D. They speed up all the neutrons

  8. Question 8

    Fission or fusion: can cause a chain reaction?

    • A. fission
    • B. fusion

  9. Question 9

    Fission and fusion: which statement is NOT true?

    • A. Both fission and fusion convert a small amount of mass into energy.
    • B. Today's nuclear power stations use fusion.
    • C. Fission products are usually radioactive.
    • D. Fusion releases energy in the Sun.

  10. Question 10

    Why is fusion so hard to achieve on Earth?

    • A. Fusion only works with uranium
    • B. There is no hydrogen on Earth
    • C. Nuclei repel each other, so extremely high temperatures and pressures are needed
    • D. Fusion releases no energy

  11. Question 11

    Fission or fusion: needs extremely high temperature and pressure?

    • A. fission
    • B. fusion

  12. Question 12

    Fission and fusion: which statement is NOT true?

    • A. A nuclear reactor uses a moderator to slow neutrons down.
    • B. A nuclear power station can explode like a nuclear bomb.
    • C. Fission products are usually radioactive.
    • D. Fusion releases energy in the Sun.

  13. Question 13

    What starts a chain reaction in uranium-235?

    • A. electrons jumping between atoms
    • B. neutrons released by one fission go on to cause more fissions
    • C. gamma rays splitting protons
    • D. heat melting the fuel

  14. Question 14

    Fission or fusion: used in today's nuclear power stations?

    • A. fission
    • B. fusion

  15. Question 15

    Fission and fusion: which statement is NOT true?

    • A. Fusion releases energy in the Sun.
    • B. Both fission and fusion convert a small amount of mass into energy.
    • C. A nuclear reactor uses a moderator to slow neutrons down.
    • D. A nuclear power station can explode like a nuclear bomb.

  16. Question 16

    In 2022 a US laser facility (the National Ignition Facility) reported a fusion milestone. What was it?

    • A. uranium was fused into gold
    • B. a fusion power station started supplying homes
    • C. more fusion energy came out of the fuel than the laser energy delivered to it
    • D. fusion was achieved at room temperature

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Answer key: Nuclear fission and fusion

  1. 1. A. Nuclei repel each other, so extremely high temperatures and pressures are needed

  2. 2. B. fusion

  3. 3. B. Fusion splits large nuclei.

  4. 4. A. They absorb neutrons to control the rate of the chain reaction

  5. 5. B. fusion

  6. 6. B. Today's nuclear power stations use fusion.

  7. 7. A. They absorb neutrons to control the rate of the chain reaction

  8. 8. A. fission

  9. 9. B. Today's nuclear power stations use fusion.

  10. 10. C. Nuclei repel each other, so extremely high temperatures and pressures are needed

  11. 11. B. fusion

  12. 12. B. A nuclear power station can explode like a nuclear bomb.

  13. 13. B. neutrons released by one fission go on to cause more fissions

  14. 14. A. fission

  15. 15. D. A nuclear power station can explode like a nuclear bomb.

  16. 16. C. more fusion energy came out of the fuel than the laser energy delivered to it