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Different Half-lives Of Radioactive Isotopes (GCSE Physics)

The following is a GCSE Physics test covering 'Different Half-lives Of Radioactive Isotopes' from the broader topic Atomic Structure. The test is geared towards the AQA exam board style syllabus.
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Below a typical questions that will be covered in this test. You final score will be logged on your account

What is the SI unit for radioactivity (activity)?
Which precaution reduces hazard from long half-life radioactive waste?
Which formula gives the fraction of nuclei remaining after time t for an isotope with half-life T?
A rock sample has a radioactive isotope whose half-life is 64.37 s. After 257.48 s (4 × 64.37 s) the activity will be what fraction of original?
An isotope used in diagnostics has half-life of minutes; which handling practice is most important?
A sample’s activity is 3200 Bq initially. After 6 hours it is 400 Bq. What is the number of half-lives that have passed?
Which statement is true: a shorter half-life implies which of the following?
If a sample undergoes 3 half-lives, what fraction of the original nuclei remains?
You measure a sample’s remaining fraction to be (1/2)^(t/T) and rearrange to find T. To estimate half-life from measured N0 and N after time t, which equation is correct?
A sample’s activity is 10 000 Bq initially. After time t it is 625 Bq. How many half-lives occurred?
For a given activity A and decay constant ?, which relationship between number of atoms N and activity A is correct?