Practice test

Atomic and nuclear physics - Test Set 2

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

    Consider the following statements
    I. Alpha rays emitted from a radioactive substance are helium nucleus.
    II. Beta rays emitted by radioactive substance are charged particles emitted by the nucleus.
    III. Gamma rays are electromagnetic waves.
    IV. The nuclear force is a short range force.
    Which of the statements given above are correct?
    1. I, II and III
    2. II, III and IV
    3. I, II and IV
    4. All of these
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  2. Question 2

    In the nuclear reactors, moderators are used to:
    1. Slow down the neutrons
    2. Generate neutrons
    3. Accelerate neutrons
    4. Absorb neutrons
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  3. Question 3

    Graphite is used in the nuclear reactor as:
    1. Fuel
    2. Lubricant
    3. Moderator
    4. None of the above
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  4. Question 4

    Basic scientific principle behind a nuclear reactor is:
    1. Nuclear fusion
    2. Controlled nuclear fusion
    3. Uncontrolled nuclear fission
    4. Controlled nuclear fission
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  5. Question 5

    The controller rods in a nuclear reactor are made of:
    1. Cadmium
    2. Uranium
    3. Graphite
    4. Plutonium
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  6. Question 6

    Consider the following statements
    I. Plutonium-239 can be made artificially.
    II. Boron is used in a nuclear reactor to absorbs unwanted neutrons.
    III. In nature, the availability of uranium-238 is much more than that of uranium-235.
    Which of these statement(s) is/are correct?
    1. Only I
    2. I and II
    3. Only III
    4. I, II and III
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  7. Question 7

    Which statement is not associated with nuclear fission?
    1. Neutron-induced nuclear reaction.
    2. Energy generation in stars.
    3. Source of energy in nuclear reactor that produces electricity.
    4. Enormous energy is released in an atom bomb.
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  8. Question 8

    Hydrogen bomb was developed by:
    1. Edward Teller
    2. Bernor Bon Bron
    3. J. Robert Opan Heemar
    4. Samual Cohen
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  9. Question 9

    The source of energy of the sun is:
    1. Nuclear fusion
    2. Nuclear fission
    3. Photoelectric reaction
    4. Photovoltaic reaction
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  10. Question 10

    Fusion reaction takes place at high temperature, because
    1. nuclei break up at high temperature
    2. atoms are ionised at high temperature
    3. molecules break up at high temperature
    4. kinetic energy is high enough to overcome repulsion at high temperature
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  11. Question 11

    Consider the following statements.
    The chain reaction process is used in nuclear bombs to release a vast amount of energy, but in nuclear reactors, there is no chain reaction.
    II. In a nuclear reactor, the reaction is controlled, while in nuclear bombs, the reaction is uncontrolled.
    III. In a nuclear reactor, all operating reactors are ‘critical’, while there is no question of ‘critically’ in case of a nuclear bomb.
    IV. Nuclear reactors do not use moderators, while nuclear bombs use them.
    Which of the above statements about operational principles of a nuclear reactor and a nuclear bomb is/are correct?
    1. I and III
    2. II and III
    3. IV only
    4. I and IV
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  12. Question 12

    The efforts to detect the existence of Higgs Boson particle have become frequent news in the recent past. What is/are the importance/importances of discovering this particle?
    I. It will enable us to understand as to why elementary particles have mass.
    II. It will enable us in the near future to develop the technology of transferring matter from one point to another without traversing the physical space between them.
    III. It will enable us to create better fuels for nuclear fission.
    Select the correct answer using the codes given below
    1. Only I
    2. II and III
    3. I and III
    4. All of these
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  13. Question 13

    Glass is best described as:
    1. A gel
    2. An alloy
    3. A eutectic mixture
    4. A supercooled solution
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  14. Question 14

    Hydrogen Bombs is based on the principle of:
    1. Nuclear fission
    2. Nuclear explosion
    3. Nuclear fusion
    4. None of the above
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  15. Question 15

    Solar energy is due to:
    1. Nuclear fusion reaction
    2. Burning of H₂O
    3. Nuclear fission reaction
    4. Chemical reaction
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  16. Question 16

    Of the following which is different from the others?
    1. Cathode rays
    2. Photo electrons
    3. X-rays
    4. Thermal electrons
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  17. Question 17

    75% of a radioactive element decays in 6 hours. Its half-life period is:
    1. 2 hours
    2. 4 hours
    3. ¹⁄₆ hours
    4. 3 hours
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  18. Question 18

    SSC CGL 2017
    Which phenomena shows particle nature of light?
    1. Diffraction
    2. Interference
    3. Photoelectric effect
    4. Polarisation
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  19. Question 19

    The light is composed of small particles, called ……….
    1. Proton
    2. Photon
    3. Alpha particle
    4. Electron
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  20. Question 20

    Electron emission from a metallic surface by application of light is known as:
    1. Thermionic emission
    2. Photoelectric emission
    3. High field emission
    4. Auto electronic emission
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