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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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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?
A sample’s activity is 10 000 Bq initially. After time t it is 625 Bq. How many half-lives occurred?
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?
A sample’s activity falls to one-quarter of its original value. How many half-lives have passed?
If activity (count rate) of a source is 1600 Bq, what will its activity be after 2 half-lives?
Isotope A has half-life 2 days, Isotope B half-life 10 days. Which is more suitable to use as a medical diagnostic tracer that must decay quickly?
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?
You measure that activity dropped from 10 000 Bq to 1250 Bq. How many half-lives elapsed?
Which statement is true: a shorter half-life implies which of the following?
Which formula gives the fraction of nuclei remaining after time t for an isotope with half-life T?
If an isotope’s activity halves every 5 years, how long until activity is 6.25% of original?