Explanation : Please refer to ‘square of opposition’. If a statement is false, its contradictory is taken to be true. The
contradictory of ‘No politician is dishonest’ (E type) is
‘Some politicians are dishonest’ (I type). So it is true.
Explanation : As there is a single proposition, we can apply
immediate inference to draw conclusion. This is an
E-type proposition with ‘teacher’ as subject and ‘(persons) on time for the class’ as the predicate which can
conclude only E type. After conversion, ‘persons who
are on time’ becomes subject, and teacher becomes
predicate. So, option (a) is the answer.