Practice test

Radioactivity and nuclear energy - Test Set 5

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

    Who coined the term "radioactivity"?
    1. Henri Becquerel
    2. Marie Curie
    3. Pierre Curie
    4. Rutherford
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  2. Question 2

    Which of the following is not a product of nuclear fission of Uranium-235?
    1. Krypton
    2. Barium
    3. Neutrons
    4. Helium
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  3. Question 3

    The device used to measure ionizing radiation exposure over time is:
    1. GM counter
    2. Dosimeter
    3. Electroscope
    4. Ammeter
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  4. Question 4

    Which component of a nuclear reactor helps to extract heat from the core?
    1. Graphite
    2. Control rod
    3. Coolant
    4. Fuel rod
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  5. Question 5

    Which of the following radiations can be deflected by electric and magnetic fields?
    1. Alpha and Beta
    2. Only Gamma
    3. Only Beta
    4. Gamma and Neutron
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  6. Question 6

    Which radioactive isotope is used in the study of red blood cell survival time?
    1. Gallium-67
    2. Carbon-14
    3. Chromium-51
    4. Xenon-133
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  7. Question 7

    Alpha particles are emitted from:
    1. Stable isotopes
    2. Light elements
    3. Heavy unstable nuclei
    4. Noble gases
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  8. Question 8

    Which one of the following is most suitable for carbon dating?
    1. Carbon-14
    2. Thorium-232
    3. Iodine-131
    4. Uranium-235
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  9. Question 9

    Which part of the reactor prevents radiation leakage?
    1. Graphite moderator
    2. Coolant pipes
    3. Containment structure (shield)
    4. Control rods
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  10. Question 10

    What is the purpose of cadmium rods in a reactor?
    1. Initiate fission
    2. Slow neutrons
    3. Cool the reactor
    4. Absorb excess neutrons
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  11. Question 11

    A sample undergoes three half-lives. What fraction remains?
    1. 1/3
    2. 1/6
    3. 1/8
    4. 1/16
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  12. Question 12

    Which isotope is commonly used for industrial thickness gauging (e.g., paper, metal)?
    1. Iodine-131
    2. Strontium-90
    3. Americium-241
    4. Cobalt-60
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  13. Question 13

    The first nuclear reactor in India was:
    1. Dhruva
    2. Kamini
    3. Apsara
    4. CIRUS
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  14. Question 14

    What is the energy equivalent of 1 amu (atomic mass unit)?
    1. 931 MeV
    2. 1.6 MeV
    3. 186 MeV
    4. 760 MeV
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  15. Question 15

    A radioactive sample decays to 1/16th of its original activity in 4 hours. What is its half-life?
    1. 1 hour
    2. 2 hours
    3. 0.5 hour
    4. 4 hours
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  16. Question 16

    Which isotope is used in cancer radiotherapy?
    1. Iodine-131
    2. Uranium-235
    3. Carbon-14
    4. Cobalt-60
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  17. Question 17

    Which Indian nuclear power plant uses fast breeder reactor technology?
    1. Kaiga
    2. Kalpakkam
    3. Tarapur
    4. Narora
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  18. Question 18

    Which element is used as a moderator in pressurized heavy water reactors (PHWR)?
    1. Graphite
    2. Light water
    3. Heavy water
    4. Boron
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  19. Question 19

    Which of the following is not an ionizing radiation?
    1. Alpha
    2. Beta
    3. Gamma
    4. Infrared
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  20. Question 20

    A hydrogen bomb works on which principle?
    1. Nuclear fission
    2. Nuclear fusion
    3. Photoelectric effect
    4. Induced radioactivity
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