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At that top of the page is a graph showing the output on a CRO for a
constantly rotating coil in a particular generator. The question
specifically states the emf is being measured. The graph is a uniform
sine curve with 4 or 5 complete cycles shown. Beneath the graph is a
statement saying that it is impossible to state with certainty that
the output is being produced by an AC generator, that it may be a DC
generator causing the output on the CRO. They are then asked to
justify this statement.
I am putting this up for comment, as my staff disagree about the
validity of the question.