641. Who is the author of “Wake up India”?
Annie Besant
642. In terms of area; India is which largest country of the world?
Seventh
643. By whom are the planets are kept in motion in their respective orbits?
Gravitation and centrifugal force
644. Who is the author of “Ram Rahim”?
Raja Radhika Prasad
645. Why does the phenomenon of ‘trade winds’ takes place?
Due to convection of heat
646. Which was a revolutionary who later turned into a yogi and a philosopher?
Aurobindo Ghosh
647. Who is the author of Our Films; Their Films ?
Satyajit Ray
648. Inside the body; why does blood not coagulate?
Due to the presence of heparin
649. Who is the author of Twenty Years After ?
Alexander Dumas
650. Which compound does not contains an OH group?
Aldehyde