Practice test

Radioactivity and nuclear energy - Test Set 4

Review 20 exam-focused questions with detailed explanations, then start the interactive test when you are ready.

20 questions

Questions and explanations

  1. Question 1

    Which material is used as a coolant in fast breeder reactors?
    1. Heavy water
    2. Liquid sodium
    3. Graphite
    4. Boron
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  2. Question 2

    Which scientist developed the liquid drop model of the nucleus?
    1. Niels Bohr
    2. Enrico Fermi
    3. Ernest Rutherford
    4. Werner Heisenberg
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  3. Question 3

    Who is credited with the discovery of radioactivity?
    1. Marie Curie
    2. Pierre Curie
    3. Henri Becquerel
    4. Ernest Rutherford
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  4. Question 4

    The SI unit of radioactivity is:
    1. Curie
    2. Rutherford
    3. Becquerel
    4. Roentgen
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  5. Question 5

    One Curie (Ci) of radioactivity is equivalent to approximately:
    1. 1×107 disintegrations per second
    2. 3.7×1010 disintegrations per second
    3. 6.022×1023 disintegrations per second
    4. 1×103 disintegrations per second
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  6. Question 6

    Natural radioactivity is exhibited by elements with atomic number greater than:
    1. 72
    2. 82
    3. 92
    4. 100
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  7. Question 7

    What is the primary characteristic that differentiates isotopes of an element?
    1. Number of protons
    2. Number of electrons
    3. Number of neutrons
    4. Atomic number
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  8. Question 8

    Which of the following radiations has the highest ionizing power?
    1. Alpha rays
    2. Beta rays
    3. Gamma rays
    4. X-rays
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  9. Question 9

    Beta particles are essentially:
    1. High-energy photons
    2. Fast-moving electrons or positrons
    3. Helium nuclei
    4. Neutrons
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  10. Question 10

    What is an alpha particle?
    1. An electron
    2. A proton
    3. A helium nucleus (24He)
    4. An electromagnetic wave
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  11. Question 11

    Positron Emission Tomography (PET) scan utilizes which type of decay?
    1. Alpha decay
    2. Beta-minus decay
    3. Beta-plus decay (positron emission)
    4. Gamma decay
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  12. Question 12

    The term "radioactive fallout" refers to:
    1. The natural decay of radioactive elements in soil.
    2. Radioactive particles dispersed into the atmosphere after a nuclear explosion.
    3. The safe disposal of nuclear waste
    4. The process of nuclear fission in a reactor.
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  13. Question 13

    Which of the following is a major environmental concern associated with nuclear power?
    1. Air pollution from burning fossil fuels.
    2. Greenhouse gas emissions during reactor operation.
    3. Management and disposal of radioactive waste.
    4. Depletion of ozone layer.
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  14. Question 14

    The half-life of a radioactive element is a measure of its:
    1. Stability
    2. Amount of energy released
    3. Rate of decay
    4. Chemical reactivity
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  15. Question 15

    Which of the following is a safety measure taken in nuclear power plants?
    1. Using highly enriched uranium at all times.
    2. Operating without a cooling system.
    3. Employing multiple containment barriers and redundant safety systems.
    4. Discharging radioactive waste directly into rivers.
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  16. Question 16

    Which part of the nuclear reactor absorbs neutrons to prevent chain reaction from going out of control?
    1. Fuel rods
    2. Moderator
    3. Control rods
    4. Concrete shield
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  17. Question 17

    Which element has the maximum binding energy per nucleon?
    1. Uranium
    2. Iron
    3. Helium
    4. Lead
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  18. Question 18

    Which radioactive element was first used in early atomic bombs?
    1. Thorium
    2. Radon
    3. Uranium-235
    4. Iodine-131
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  19. Question 19

    A neutron has:
    1. Positive charge
    2. Negative charge
    3. No charge
    4. Both positive and negative charges
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  20. Question 20

    Which of the following radioactive emissions has no mass and no charge?
    1. Alpha
    2. Beta
    3. Neutron
    4. Gamma
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