Quiz  /  Half Life Class 12 MCQ Questions With Answers

  • 1. 
    The half life of iodine-131 is 8.040 days. What percentage of an iodine-131 sample will remain after 40.20 days?

  • 312.5%
  • 31.25%
  • .3125%
  • 3.125%

  • 2. 
    146C has a half life of 5730 years, how many years would it take the 4.0 g sample to decay to 0.25 g?

  • 4 years
  • 5730 years
  • 22,920 years
  • 28,650 years

  • 3. 
    What makes an element radioactive?

  • When it's nuclei expands
  • When it's electrons explode
  • When it's nuclei behave
  • When it's nuclei decay

  • 4. 
    Describe the structure of an alpha particle.

  • a fast-moving electron
  • 2 protons and 2 neutrons
  • a slow-moving neutron
  • a hydrogen nucleus

  • 5. 
    Technetium-99 isotope has a half-life of 6.0 hours. If 100.0 mg were injected into a patient how much remains after 18 hours?

  • 33.0 mg
  • 12.5 mg
  • .33 mg
  • 15.8 mg
  • 50.0 mg

  • 6. 
    Why does beta decay occur?

  • The nucleus is too large to be stable
  • The proton to neutron ratio is unstable
  • The nucleus is in an excited state. This usually follows other types of decay.
  • The nucleus is too small to be viable by itself
  • The isotope has too many high energy electrons

  • 7. 
    How many half-live will Ca-37 go through in 1092 ms?

  • 1
  • 3
  • 6
  • 9

  • 8. 
    Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80.0 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?

  • 0.250 g
  • 2.50 g
  • 25.0 g
  • 80.0 g

  • 9. 
    A 2.5 gram sample of an isotope of strontium-90 was formed in a 1960 explosion of an atomic bomb at Johnson Island in the Pacific Test Site. The half-life of strontium-90 is 28 years. In what year will only 0.625 grams of this strontium-90 remain?

  • 1988
  • 2016
  • 2044
  • 2072

  • 10. 
    What is the relative charge of an alpha particle?

  • -1
  • 0
  • 1
  • 2

  • 11. 
    Solve this equation for beta decay.614C = ___ + -10e

  • 410Be
  • 714N
  • 210He
  • 613C

  • 12. 
    If the half-life of uranium-232 is 70 years, how many years will it take for 10 g of it to be reduced to 1.25 g?

  • 350 years
  • 232 years
  • 210 years
  • 140 years
  • 17 years

  • 13. 
    Why does gamma decay occur?

  • The nucleus is too large to be stable
  • The proton to neutron ratio is unstable
  • The nucleus is in an excited state. This usually follows other types of decay.
  • The nucleus is too small to be viable by itself
  • The isotope has too many high energy electrons

  • 14. 
    Why do some elements have half-lives?

  • they radioactively decay
  • half of their atom gets stolen
  • They are Twizzlers that break in half

  • 15. 
    What is the term for an ongoing series of nuclear reactions?

  • radiation
  • chain reaction
  • fusion
  • nucleotide
  • radioactivity

  • 16. 
    Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?

  • 0.25g
  • 2.5g
  • 25g
  • 80g

  • 17. 
    If you change external conditions (i.e. temperature, pressure, etc.) the half-life of a substance will

  • Increase
  • Decrease
  • Stay the same

  • 18. 
    Nuclear fission rarely occurs spontaneously. Instead we can induce nuclear fission or this release of energy when the nucleus splits. How do we start the chain reaction of nuclear fission?

  • Shooting a high energy Proton at the sample
  • Shooting a high energy Neutron at the sample
  • Shooting a high energy Electron at the sample
  • Shooting a high energy Positron at the sample
  • Shooting a high energy Photon at the sample

  • 19. 
    The half life of iodine-131 is 8 days. What fraction of an iodine-131 sample will remain after 40 days?

  • 1/2
  • 1/64
  • 1/5
  • 1/32

  • 20. 
    If 10.0 mg of iodine-131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.

  • 1.25 mg
  • 2.50 mg
  • 5.00 mg
  • 10.0 mg

  • 21. 
    You have 100 grams of radioactive C-14. The half-life of C-14 is 5730 years. How many grams are left after 1 half-life?

  • 100 grams
  • 25 grams
  • 2 grams
  • 50 grams

  • 22. 
    The half-life of Zn-71 is 2.4 minutes. If you had 100. g to start, how many grams would you have left after 7.2 minutes has elapsed?

  • 100. g
  • 50.0 g
  • 12.5 g
  • 8.50 g

  • 23. 
    Why does alpha decay cause an atom to become a different element?

  • The number of protons decrease
  • The number of neutrons decrease
  • The number of electrons decrease

  • 24. 
    If you start with a complete sample, how much of the sample is left after the third half-life?

  • 1/2
  • 1/3
  • 1/16
  • 1/8
  • 1/5

  • 25. 
    Who's the better football team?!

  • Kentucky Wildcats
  • Georgia Bulldogs
  • Notre Dame Fighting Irish
  • Austin Peay Governors
  • Georgia Tech Yellow Jackets

  • 26. 
    When an element loses protons, its __________changes.

  • protonic number
  • electronic number
  • neutronic number
  • atomic number

  • 27. 
    What is the half-life of Radon-222?

  • 1599 years
  • 27.4 seconds
  • 3.823 days
  • 12.36 hours

  • 28. 
    Fission is the nuclear process of splitting an atom's nucleus into two smaller elements, which of the following types of radiation is most similar to the fission reaction?

  • Alpha radiation
  • Beta radiation
  • Gamma radiation
  • Fusion radiation
  • Electron capture

  • 29. 
    Positron emission causes that atomic number to

  • increase by 1.
  • decrease by 1.
  • decrease by 2.
  • remain the same.
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