531. Which civilization invented water clock and sundial to know the time ?
Babilonian civilization
532. When did the first linguistic State of Andhra come into existence?
October 1 ; 1953
533. Of which allocation does Gadgil Formula refer to?
Tax proceeds between the States
534. Burdwan Trophy is associated with?
Weightlifting
535. Which gas is used for refrigeration?
Ammonia
536. The Currency of Barbuda?
Dollar
537. ATM system was first launched in London in the year?
1967
538. Risk; Uncertainty; and Profit was written by ?
Frank H. Knight
539. Which together constitute the plants and animals of a region?
Flora and Fauna
540. Who stated "In the struggle for survival; the fittest win out at the expense of their rivals because they succeed in adapting themselves best to their environment' ?