2981: Strips of two metals A and B are firmly joined together as shown in the figure.
2982: 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
2983: On another planet, the local terminology for earth, water, light, air and sky, are sky, light, air, water and earth respectively. If someone is thirsty there, what would he drink ?
(a) Sky
(b) Water
(c) Air
(d) Light
2984: The marine animal called dugong which is vulnerable to extinction is a/an
(a) Shark
(b) Mammal
(c) Amphibian
(d) Bony fish
2985: Which one of the following amendments to the Indian Constitution empowers the President to send back any matter for reconsideration by the Council of Ministers?
(a) 39th
(b) 40th
(c) 42nd
(d) 44th