Radioactivity Quiz

Who discovered X-ray accidentally in 1895?

• Marie Curie

• Wilhelm Roentgen

• Pierre Curie

• Henri Becquerel

What did Henri Becquerel discover in 1896?

• X-ray

• Polonium and Radium

• Uranium

• Proof of radioactivity

What is the S.I unit for radioactivity?

• Roentgen

• Sievert

• Becquerel

• Curie

What is the half-life of a radioactive substance?

• Time taken for the number of nuclei to decay to half of its original number

• Time taken for the number of nuclei to decay to one-fourth of its original number

• Time taken for the number of nuclei to decay to one-third of its original number

• Time taken for the number of nuclei to decay to one-tenth of its original number

If a radioactive substance had a half life of 5 days, what fraction would be left after 20 days?

• 1/2

• 1/4

• 1/8

• 1/16

Which type of radiation has the highest ionising power?

• Beta particles

• Gamma ray

• Alpha particles

• X-ray

What is the unit of dose rate measurement for background radiation?

• Curie

• Joule

• Sievert

• Watt

What can overexposure to ionising radiation cause?

• Skin burns

• Hair loss

• All of the above

• Nausea

What's the half life of this substance?

• 1 day

• 2 days

• 3 days

• 4 days

Which type of radiation is blocked by a piece of paper?

• X-ray

• Alpha particles

• Gamma ray

• Beta particles