Practice MCQs For Radioactivity and the nuclear atom

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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1. $^{14}_{6} \text{C}$ represents a nuclide of the element carbon and $^{14}_{7} \text{N}$ a nuclide of nitrogen.

How does a neutral atom of $^{14}_{7} \text{N} $ differ from a neutral atom of $^{14}_{6} \text{C} $?
2. A detector is used to measure the count-rate near a radioactive source. The reading is 4000 counts 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 background radiation.
3. The half-life of radioactive carbon is 5600 years. What will be the time after which the activity has reduced to one-quarter?
4. The half-life of a radioactive material is 24 years.

The activity of a sample falls to a fraction of its initial value after 72 years.

What is the fraction?
5. The diagram shows the apparatus used in an experiment in which barriers of various materials are placed in turn between different radioactive sources and a detector.

G-M tube and barrierThe table shows the count rates recorded by the detector for four sources.

Which source emits alpha-particles only?
SourceCount Rate (Counts Per Minute)
No barrierPaperThin AluminiumThick Lead
6. The neutral atoms of all isotopes of the same element contain the same number of __________.
7. A nucleus is represented by $^{230}_{91} \text{Z}$. It emits one alpha-particle and then one beta-particle. What is the resulting nucleus X?
8. What is the safest way to dispose of a large quantity of highly radioactive waste?
9. Which statement defines isotopes?
10. Which conclusion can be drawn from the Geiger-Marsden alpha-particle scattering experiment?


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