Quiz  /  Radioactivity Class 11 MCQ Questions With Answers

  • 1. 
    Copper-63 undergoes gamma decay to produce what daughter isotope?

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

  • 2. 
    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

  • 3. 
    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

  • 4. 
    Which isotope of carbon is radioactive?

  • carbon-12
  • carbon-13
  • carbon-14
  • carbon-13 and carbon-14

  • 5. 
    An unstable nucleus has 145 neutrons and 92 protons. It emits a β-particle.How many neutrons and protons does the nucleus have after emitting the β-particle?

  • A
  • B
  • C
  • D

  • 6. 
    The name __________ references the native country of Marie Curie.

  • Aluminum
  • Polonium
  • Radium
  • Uranium

  • 7. 
    Suggest way that a scientist can protect themselves against exposure when handling radioactive sources.

  • Storing sources in a lead–lined box using tongs
  • Goggles and gloves
  • Tie hair back

  • 8. 
    What was unusual about the exposure of photographic plates by uranium?

  • The exposure was affected by a magnetic field.
  • The rate of exposure varied depending on the temperature.
  • No external energy input was required.
  • The rate of exposure was very slow.

  • 9. 
    Which line in the table describes the nature of an α-particle and of a γ-ray?

  • A
  • B
  • C
  • D

  • 10. 
    A Geiger counter detects radiation from radioactive sources.A radioactive source is inside a thick aluminium container as shown:Which type of radiation from this source is being detected?

  • α-particles
  • β-particles
  • γ-rays
  • radio waves

  • 11. 
    A nucleus with excess neutrons may decay radioactively with the emission of a/an

  • neutron
  • electron
  • proton
  • positron

  • 12. 
    Which type of radiation has the greatest ionising effect?

  • α-particles
  • β-particles
  • γ-rays
  • all have the same ionising effect

  • 13. 
    Ra decays with a half-life of 1600 s.Rn decays with a half-life of 52 s.Po decays with a half-life of 9.1 s.Pb decays with a half-life of 10.6 h.The changing count rate for one of these radioactive nuclides is shown in the graph.From the half-life shown by the graph, which was the decaying radioactive nuclide?

  • Ra
  • Rn
  • Po
  • Pb

  • 14. 
    Beta decay involves the emission of a proton from a radioactive nucleus.

  • true
  • false

  • 15. 
    Which of these is a use of alpha radiation?

  • Sterilising food
  • Smoke detectors
  • Monitoring paper thickness
  • Industrial tracers

  • 16. 
    What isotope produces Boron-11 when it emits a positron?

  • soidum-23
  • carbon-11
  • magnesium-23

  • 17. 
    Which isotope is formed when U-238 emits an alpha particle?

  • Ra-226
  • Th-234
  • U-238

  • 18. 
    Atoms of each element have a unique number of __________ .

  • protons
  • electrons
  • neutrons
  • isotopes

  • 19. 
    Ernest Rutherford was the first scientist to demonstrate that there were at least three distinct types of ___________ emissions, and that each differed in their mass and properties.

  • radioactive
  • alpha
  • gamma

  • 20. 
    A narrow beam of alpha-particles is fired at a thin piece of gold foil.Which is the final direction of the largest number of alpha-particles?

  • A
  • B
  • C
  • D

  • 21. 
    The equation shows the decay of the nuclide X:What are the values of P and Q ?

  • A
  • B
  • C
  • D

  • 22. 
    Henry Becquerel studied salts of which element?

  • radium
  • iron
  • uranium
  • technetium

  • 23. 
    A radioactive isotope has a half-life of 2 minutes. What can be deduced from this statement?

  • After 2 minutes, half of the isotope remains.
  • After 1 minute, half of the isotope remains.
  • After 4 minutes, half of the isotope remains.
  • After 4 minutes, none of the isotope remains.

  • 24. 
    The phenomenon of the spontaneous emission of certain kinds of radiation by some elements is called radioactivity.

  • True
  • False

  • 25. 
    Which gas is the most common source of background radiation

  • Radium
  • Radio
  • Radon
  • Rubidium

  • 26. 
    Who first used the term "radioactivity"?

  • Henning Brand
  • Marie Curie
  • Sidney Altman
  • Pierre Curie

  • 27. 
    Which line in the table describes the nature of an alpha-particle and a gamma-ray?

  • A
  • B
  • C
  • D
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