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the one on how the reading doesn't decrease but increases?what is the answer for the first question in radioactivity?
they will mark on two specific points - BACKGROUND radiation and spontaneousness on radioactivity.
a similar question came in a previous year, so I knew this was the way to answer it:
the radiaoactive substance had decayed to a stable particle, but the counts reading did not decrease and there was still background radiation (youcan mention some sources of it too). the reading increased a bit too as radioactivity is random or spontaneous, so the background radiation can spike at times.
note : by an increase they dont mean a huge increase, just minor ups and downs as you could see in the graph. hence the best fit line was drawn.