Who was among following to receive first Bharat Ratna?

Who among the following is not appointed by the President

Among the following who has been Speaker of Lok Sabha prior to his Election as President of India ?

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

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

Who amongst the following has the power to withhold assent to a Bill, after it has been passed by the two Houses of Parliament?