306: In terms of economy, the visit by foreign nationals to witness the XIX Common Wealth Games in India amounted to
(a) Imports
(b) Exports
(c) Consumption
(d) Production
307: Which one of the following can be used to confirm whether drinking water contains a gamma emitting isotope or not?
(a) Microscope
(b) Lead plate
(c) Scintillation counter
(d) Spectrophotometer
308: Consider the following statements:
1. During the process of osmosis, the solvent travels from concentrated solution to the diluted solution.
2. In the reverse osmosis, external pressure is applied to the dilute solution.
Which of the following statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
309: Which of the following rivers has a bird's foot delta?
(a) The Amazon
(b) The Brahmaputra
(c) The Mississippi
(d) The Nile
310: Within biological communities, some species are important in determining the ability of a large number of other species to persist in the community. Such species are called
(a) Keystone species
(b) Allopatric species
(c) Sympatric species
(d) Threatened species