Quiz  /  Radioactivity Class 10 MCQ Questions With Answers

  • 1. 
    Which type(s) of radiation is a fast moving electron?

  • alpha
  • beta
  • gamma
  • alpha and beta
  • beta and gamma

  • 2. 
    What change takes place to an atom during beta decay?

  • A proton changes into a neutron
  • A proton changes into an electron
  • An electron changes into a neutron
  • A neutron changes into a proton

  • 3. 
    The substance which disintegrate by the spontaneous emission of photographic rays are called radioactive substances.

  • True
  • False

  • 4. 
    Copper-63 undergoes gamma decay to produce what daughter isotope?

  • nickel-62
  • copper-63
  • nickel-63
  • copper-64

  • 5. 
    Which type of radiation releases an electron?

  • Alpha radiation
  • Beta radiation
  • Gamma radiation
  • Theta radiation

  • 6. 
    What is the symbol for an alpha particle?

  • 42He
  • 0-1e
  • 0+1 e
  • 10n

  • 7. 
    A source has an activity of 200. Over a period of 8 days, it drops to an activity of 50. What is its half-life?

  • 8 days
  • 6 days
  • 4 days
  • 2 days

  • 8. 
    The type of radioactive particle that can be stopped by a sheet of paper is the ____.

  • alpha particle
  • beta particle
  • gamma ray
  • uranium

  • 9. 
    Which of the following defines the Mass number of an atom?

  • number of protons + number of electrons
  • number of neutrons + number of electrons
  • number of protons + number of neutrons
  • number of electrons

  • 10. 
    In a nuclear reaction, a positron emission results in the...

  • Decrease of the atomic number by two unit
  • Increase of the atomic number by one unit
  • Decrease of the atomic number by one unit
  • Increase of the atomic number by two unit

  • 11. 
    Atoms with the same number of protons, but different numbers of neutrons, are called...

  • Isotopes
  • Ions
  • Atoms
  • Nucleons

  • 12. 
    Name the person who discovered electrons

  • Isaac Newton
  • Chadwick
  • J.J.Thomson
  • Rutherford

  • 13. 
    In the symbol 20682Pb what does 206 stand for?

  • Mass number
  • Atomic number
  • Atomic mass
  • Number of protons

  • 14. 
    Solve this equation for alpha decay.85209At = ___ + 24He (If you need to sing to remember, please do...)

  • 83205Bi
  • 86209Rn
  • 81207Tl
  • 85208At

  • 15. 
    What type of decay is shown here?

  • Alpha
  • Beta
  • Gamma
  • Photon

  • 16. 
    Two isotopes of the same element have

  • the same number of protons but different numbers of neutrons
  • the same number of protons but different numbers of electrons
  • the same number of neutrons but different numbers of protons
  • the same number of electrons but different numbers of protons

  • 17. 
    Which type of radioactive decay is occurring in this equation?

  • Alpha decay
  • beta decay
  • gamma decay
  • positron emission

  • 18. 
    Protons and neutrons which are the main constituents of the nucleus are called

  • Nucleons
  • Electrons
  • Nucleus
  • Protons

  • 19. 
    As a result of alpha decay, the atomic number of a nuclide _______________ , while the mass number _______________ .

  • increases by one; stays the same
  • decreases by two; decreases by four
  • decreases by one; stays the same
  • decreases by two; decreases by one

  • 20. 
    The isotopes of neutral atoms of an element differ in

  • Atomic number
  • Mass number
  • Number of electrons
  • Chemical properties

  • 21. 
    The splitting of a nucleus into smaller nuclei is

  • fusion
  • fission
  • decay
  • gamma radiation

  • 22. 
    A radioactive source has an activity of 120, and a half-life of 2 years. What will its activity be in 6 years?

  • 0
  • 15
  • 30
  • 60

  • 23. 
    Which of the following half-lives would be most suitable for a medical tracer used in a patient?

  • 3 minutes
  • 3 hours
  • 3 days
  • 3 years

  • 24. 
    Identify the missing substance in each of the following nuclear reaction. _____→13756 Ba + 0−1 e

  • 13755Ba
  • 13757La
  • 13856Ba
  • 13755Cs

  • 25. 
    A radioactive nuclide has a ____ stable nucleus than a non-radioactive nucleus of the same element.

  • more
  • less
  • identical
  • small

  • 26. 
    What makes something radioactive?

  • elements with an atomic number above 81
  • an unstable nucleus
  • contaminated sewage
  • It decays over time

  • 27. 
    The process of nuclear fusion results in the production of

  • one new atom with a smaller mass than the mass of the original two atoms.
  • one new atom with a larger mass than the mass of the original two atoms.
  • I am not a nuclear scientist, stop asking me these questions.
  • Can I phone a friend?
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