Quiz  /  Half Life Class 11 MCQ Questions With Answers

  • 1. 
    The time it takes for a radioactivity level to drop by a half is is the sample's ___________________.

  • quarter life
  • whole life
  • wonderful life
  • half life

  • 2. 
    Which order is correct for the most to least ionising

  • Alpha-Beta-Gamma
  • Beta-Alpha-Gamma
  • Gamma-Beta-Alpha
  • Gamma-Alpha-Beta

  • 3. 
    Which type of radiation has 2 protons and 2 neutrons

  • Alpha
  • Beta
  • Gamma
  • Neutron

  • 4. 
    You find a rock sample with radioactive atoms present.  If 25% of the original radioactive atoms were present, how many half-lives has the rock been around for? (Hint, at Half-Life = 0, you start with 100%)

  • zero
  • 1
  • 2
  • 3

  • 5. 
    If the radioactivity of a substance starts at 500 Bequerels. What will the radioactivity be after one half life?

  • 1000
  • 250
  • 125
  • 500

  • 6. 
    Which type of radiation is used by smoke detectors?

  • Alpha
  • Beta
  • Gamma
  • Neutron

  • 7. 
    Which of these defines irradiation

  • Radioactive particles are on the object
  • An object is exposed to radiation nearby
  • An object is radioactive itself
  • Radioactive particles don't affect the object

  • 8. 
    Using this graph, what is the half-life of the strontium?

  • 10 years
  • 25 years
  • 50 years
  • 150 years

  • 9. 
    The diagram shows 32 atoms32 of the Red are the parent isotope 0 of the atoms are daughter isotopes How many half-lives have occurred?

  • 0
  • 1
  • 2
  • 3

  • 10. 
    This is the correct equation for U-238 decay.

  • true
  • false

  • 11. 
    What type of decay is being illustrated in following picture?

  • beta decay
  • alpha decay

  • 12. 
    This is the correct equation for the decay of Ra.

  • true
  • false

  • 13. 
    Which is the best definition of half-life?

  • Half the mass of the substance is left.
  • Only half the time taken for decay to occur
  • time taken for radioactivity to halve.
  • Half total decay occurs in a certain time.

  • 14. 
    In beta decay a ______ is emitted from the nucleus

  • Neutron
  • Electron
  • Proton
  • Wave

  • 15. 
    Carbon dating relies on

  • the fact that all living things contain a small amount of carbon-14
  • organisms dying
  • washing your hands
  • organism remaining constant

  • 16. 
    If 10 mg of iodine 131 is given to a patient, how much is left after 8 days? The half-life of iodine-131 is 8 days.

  • 5.0mg
  • 1.25g
  • 10g
  • 10mg

  • 17. 
    Which two types of radioactive decay cause an atom of a new element to form?

  • Alpha and Beta
  • Beta and Gamma
  • Alpha and Gamma
  • None, no new element would form.

  • 18. 
    Why can't carbon-14 dating be used on dinosaur remains?

  • The remains of living creatures cannot be accurately dated with carbon-14
  • The carbon-14 isotope did not exist during the age of the dinosaurs.
  • Dinosaurs were reptiles who had no carbon-14 in their systems.
  • Carbon dating is only accurate to 60,000 years ago-- well after the age of the dinosaurs.

  • 19. 
    When using radioactivity for medical treatment, which of these options would you choose?

  • Alpha radiation, short half-life (few days)
  • Alpha radiation, long half-life (few years)
  • Gamma radiation, short half-life (few days)
  • Gamma radiation, long half-life (few years)

  • 20. 
    If the radioactivity of a substance starts at 800 Bequerels. What will the radioactivity be after two half lives?

  • 800
  • 400
  • 200
  • 100

  • 21. 
    The table shows the radioactive decay of carbon-14. Part of the table has been left blank.  After 22,800 years, approximately what percentage of the original carbon-14 remains?

  • 15%
  • 12.5%
  • 6.25%
  • 3.125%

  • 22. 
    The diagram shows 32 atoms.16 of the Red are parent isotopes16 of the Green are daughter isotopesHow many half-lives have occurred?

  • 0
  • 1
  • 2
  • 3

  • 23. 
    Complete the nuclear reaction85209At = ___ + 24He

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

  • 24. 
    If the radioactivity of a substance starts at 100 Bequerels. And the half life is 10 years. What will the radioactivity be after 20 years?

  • 100
  • 50
  • 25
  • 12.5

  • 25. 
    Which type of radiation is stopped by lead and concrete?

  • Alpha
  • Beta
  • Gamma
  • Neutron

  • 26. 
    In beta becay…..

  • A neutron becomes a proton and an electron
  • A proton becomes a neutrons and an electron
  • A electron becomes a protons and a neutron
  • It's just a wave

  • 27. 
    When radioactive particles get on objects. They are....

  • contaminated
  • irradiated
  • dead
  • isotopes

  • 28. 
    How many grams of Carbon-14 will remain after 17,100 years- C-14 has a half life 5,730 so 17,100 is about 3 half lives?

  • 32 g
  • 16 g
  • 8 g
  • 4 g
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