90) The river basin which is called ’Ruhr of India’ is

91) Which was an economic system where lower castes performed various functions for upper castes and in turn received grain.

92) The river Mississipi falls in?

93) Where are the coal reserves of India largely concentrated?

94) In Nov 1949 Nathuram Godse (who shot Mahatma Gandhi) was hanged at which Jail.