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

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

In case the post of President of India falls vacant, and there is no Vice-President also, who among the following would be the acting President?

Which of the following Indian President also served as Speaker of Lok Sabha?

Who among the following is not appointed by the President

Among the following Presidents of India, who was also the Secretary General of Non-Aligned Movement for some period ?