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. Which statement is true for all three types of radioactive emission (alpha-particles, beta-particles and gamma-rays)?
2. A radioactive isotope has a half-life of 2 minutes.

What can be deduced from this statement?
3. Which row gives the range and electrical charge of an alpha-particle?
Range In AirElectrical Charge
AA few centimetresNegative
BA few centimetresPositive
CA few metresNegative
DA few metresPositive
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. Which statement defines isotopes?
6. A radioactive source has a half-life of 24 hours. At 1:00 am, it has an activity of 1000 counts per minute. At 1:00 pm on the same day, what is its most likely activity?
7. The nucleus of a nitrogen atom can be represented as $^{14}_{7} \text{N}$.

The nucleus of this atom consists of
8. Which action will most increase a person's exposure to radioactivity?
9. 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
A20020020030
B200303030
C120060020030
D120012003030
10. 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?

 

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