Who among the following is the author of the book 'Mudra Rakshasa'?

48) Vishnupad Temple' is situated in

49) Jiradei', the birthplace of Dr. Rajendra Prasad comes under which district of Bihar?

50) Indian Space Research Organisation (ISRO) is situated in

51) X is mightier than Y and Y is mightier than Z. P is mightier than Q but inferior to Y. Q is mightier than Z. Who is the weakest among all?