Radioactivity MCQ

Below Radioactivity quiz are Multiple Choice Questions (MCQs) type Quiz. These Radioactivity MCQ Questions helps you to refresh your Radioactivity, you can see the correct option by clicking on it. .
  • 1. The half-life of a radioisotope is 2400 years. The activity of a sample is 720 counts /s.How long will it take for the activity to fall to 90 counts /s?

    • 300 years
    • 2400 years
    • 7200 years
    • 19 200 years
  • 2. A detector is used to measure the count-rate near a radioactive source. The reading is 4000counts per minute. After 30 minutes the count-rate has fallen to 500 counts per minute.What is the half-life of the radioactive source? You may ignore the effects of backgroundradiation.

    • 3 minutes
    • 5 minutes
    • 6 minutes
    • 10 minutes
  • 3. The centre of an atom is called

    • the electron
    • the proton
    • the nucleus
    • the neutron
  • 4. Which isotope of carbon is radioactive?

    • carbon-12
    • carbon-13
    • carbon-14
    • carbon-13 and carbon-14
  • 5. Radioactivity is a nuclear phenomenon

    • True
    • False