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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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Which precaution reduces hazard from long half-life radioactive waste?
A sample’s activity is 10 000 Bq initially. After time t it is 625 Bq. How many half-lives occurred?
If two isotopes have the same mass of sample but isotope A has a much shorter half-life than isotope B, which is true initially?
An isotope has half-life 0.62 s. Which use is most likely appropriate for this isotope?
An isotope’s activity is measured as A0 at time 0. After three half-lives the activity equals
For a given activity A and decay constant ?, which relationship between number of atoms N and activity A is correct?
Carbon-14 has half-life about 5700 years. After 11 400 years what percentage of the original C-14 remains?
Which formula gives the fraction of nuclei remaining after time t for an isotope with half-life T?
Which of these isotopes (half-lives in seconds) is the longest lived: N-18 = 0.62 s, N-17 = 4.17 s, F-17 = 64.37 s, F-18 = 6584.34 s?
If a sample undergoes 3 half-lives, what fraction of the original nuclei remains?
A sample initially contains 800 radioactive atoms. After 4 half-lives how many atoms remain?