This quiz contains practice questions for GCE ‘O’ level topic: Radioactivity and the nuclear atom. There are explanations for some of the questions after you submit the quiz. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. If you wish to contribute questions to this quiz, please contact us.

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question 1 what is the answer i didn’t know exactly?

As the source is too far from the counter the alpha particles are not able to reach till there as they can only travel few centimeters in the year.

can anybody explain me Q3?

its just the definition of isotopes

Can i get an explanation for Q6 answer?

As the definition for half-life is the time take for the acitivity of the radioactive material to be reduce by half.

So if original was “1”, after 5600 years it will be 1/2. So after another cycle of 5600 years, it will reduce by half again so 1/2 divided by 2 is 1/4. So the time taken is 5600+5600=11200 years.

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