Who among the following is not appointed by the President

Who among the following Chief Justices of India also acted as the President of India?

Who of the following before becoming the President of India did not hold the office of Vice-President?

Which one among the following statements pertaining to the President's term of office is not correct?

Who among the following Presidents of India was associated with Trade Union Movement?

Which one of the following statements about the President of India is not correct?