Radioactive Substances Quiz Questions

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Quizzes Created: 2 | Total Attempts: 1,352
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Radioactive Substances Quiz Questions - Quiz


Questions and Answers
  • 1. 

    The nucleus of a particular form of carbon (chemical symbol C) contains 6 protons and 7 neutrons. Which of the following is the correct way to represent it?

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    B. B
    Explanation
    Option B is the correct way to represent the nucleus of this particular form of carbon. The atomic number of an element represents the number of protons in its nucleus, and in this case, carbon has 6 protons. The mass number represents the total number of protons and neutrons in the nucleus, and in this case, carbon has 6 protons and 7 neutrons. Therefore, the correct representation is 6 protons and 7 neutrons, which is shown in option B.

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  • 2. 

    A particular nuclide of iron (chemical symbol Fe) is represented as follows:

    • A.

      56 neutrons

    • B.

      26 electrons

    • C.

      26 neutrons

    • D.

      26 protons

    Correct Answer
    D. 26 protons
    Explanation
    The given information states that the nuclide of iron has 26 electrons, which is equal to the atomic number of iron. The atomic number represents the number of protons in an atom. Therefore, the correct answer is 26 protons.

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  • 3. 

    How many neutrons does this nuclide have?

    Correct Answer
    30
    Explanation
    The number given in the question, 30, represents the number of neutrons in the nuclide.

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  • 4. 

    Which symbol represents a beta particle?

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    B. B
    Explanation
    The symbol "B" represents a beta particle.

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  • 5. 

    Which symbol could represent an alpha particle?

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    A. A
    Explanation
    The symbol A could represent an alpha particle. Alpha particles are made up of two protons and two neutrons, which gives them a charge of +2. The symbol A is commonly used to represent the atomic mass number, which is the total number of protons and neutrons in an atom. Therefore, A is a suitable symbol to represent an alpha particle.

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  • 6. 

    A radioactive nuclide X decays according to this equation:

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    D. D
  • 7. 

    A radioactive sample contains 8000 undecayed atoms. It hasa half-life of 4 days. What will be the number of undecayedatoms remaining after 12 days?

    Correct Answer
    1000
    Explanation
    The half-life of a radioactive sample is the time it takes for half of the atoms to decay. In this case, the half-life is 4 days. After 4 days, half of the 8000 undecayed atoms will decay, leaving 4000 undecayed atoms. After another 4 days (8 days total), half of the remaining 4000 undecayed atoms will decay, leaving 2000 undecayed atoms. Finally, after 12 days (3 half-lives), half of the remaining 2000 undecayed atoms will decay, leaving 1000 undecayed atoms.

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  • 8. 

    The graph shows the pattern of decay of a radioactive substance. What is the half-life of the substance?

    Correct Answer
    8 days
    Explanation
    The half-life of a radioactive substance is the time it takes for half of the substance to decay. In this case, the graph shows that the substance decays completely in 8 days. Therefore, the half-life of the substance is also 8 days.

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  • 9. 

    The graph bellow shows the amount of undecayed material in a sample of a radioactive substance as it decayed. When the material had decayed to a very low level, the detector still recorded background radiation. From the graph, determine the background count rate.

    Correct Answer
    20
    Explanation
    The background count rate can be determined by observing the graph. As the material decayed to a very low level, the detector still recorded a count rate of 20. This indicates that even when there is no radioactive material present, the detector still detects a background radiation count rate of 20.

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  • 10. 

    The graph bellow shows the amount of undecayed material in a sample of a radioactive substance as it decayed. When the material had decayed to a very low level, the detector still recorded background radiation. Determine the initial count rate due to the radioactive substance by calculating: initial count rate - background count rate

    Correct Answer
    100
    Explanation
    The initial count rate is equal to the sum of the background count rate and the count rate due to the radioactive substance. Since the detector still recorded background radiation when the material had decayed to a very low level, we can assume that the background count rate is 0. Therefore, the initial count rate is equal to the count rate due to the radioactive substance, which is 100.

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  • 11. 

    Which part of the atom contains most of its mass?

    • A.

      Shells

    • B.

      Orbits

    • C.

      Nucleus

    • D.

      Neutron

    Correct Answer
    C. Nucleus
    Explanation
    The nucleus contains most of the mass of an atom. It is located at the center of the atom and is made up of protons and neutrons. The protons have a positive charge, while the neutrons have no charge. The electrons, which have a negative charge, are located in shells or orbits around the nucleus. However, the mass of electrons is significantly smaller compared to the mass of protons and neutrons, which is why the nucleus contains most of the mass of an atom.

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  • 12. 

    The diagram shows the paths of some alpha particles as they approached a nucleus of a gold atom. Explain why the alpha particle (1) shown was back-scattered.

    • A.

      It's pushed back repelled by the nucleus when it passes by very near.

    • B.

      It's pushed back attracted by the nucleus when it passes by very near.

    • C.

      It's pushed back repelled by the nucleus when it passes by far away.

    • D.

      It's pushed back attracted by the nucleus when it passes by far away.

    Correct Answer
    A. It's pushed back repelled by the nucleus when it passes by very near.
    Explanation
    The alpha particle is back-scattered because it is repelled by the nucleus when it passes by very near. As the alpha particle approaches the gold nucleus, it experiences a strong electrostatic repulsion due to the positive charge of the nucleus. This repulsion causes the alpha particle to change direction and be scattered backwards. The closer the alpha particle gets to the nucleus, the stronger the repulsion and the greater the scattering angle.

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  • 13. 

    The diagram shows the paths of some alpha particles as they approached a nucleus of a gold atom.   Explain why the alpha particle (2) shown was undeflected as it passed the gold nucleus.

    • A.

      They have unlike charges.

    • B.

      It's too close to the nucleus.

    • C.

      They have like charges but it's far away from the nucleus.

    • D.

      All alpha particles are deflected.

    Correct Answer
    C. They have like charges but it's far away from the nucleus.
    Explanation
    The alpha particle (2) was undeflected as it passed the gold nucleus because it had like charges with the nucleus, but it was far away from it. Like charges repel each other, so if the alpha particle had been closer to the nucleus, it would have been deflected. However, since it was far away, the repulsive force between the like charges was not strong enough to cause any deflection.

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  • Current Version
  • May 03, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • May 31, 2015
    Quiz Created by
    Frank
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