151. The longest river is located in
(a) Asia
(b) Africa-
(c) Latin America
(d) North America
152. Broadly, there are three layers of the earth -the crust, the mantle and the core. The crust forms what percentage of the total volume of the earth?
(a) 0.5 per cent-
(b) 2.5 per cent
(c) 10.5 per cent
(d) 16.0 per cent
153. The land-mass of which of the following continents is the least?
(a) Africa
(b) Asia
(c) Australia-
(d) Europe
154. A nautical mile is equal to.
(a) 1,005 metres
(b) 1,250 metres
(c) 1,575 metres
(d) 1,852 metres-
155. A violent whirlwind characterised by a black funnel-shaped cloud hanging from heavy cumuionimus is known by the name of
(a) Antipodes
(b) Hurricane
(c) Tornado-
(d) Typhoon
156. Atmospheric temperature increases at the higher altitudes due to____.
(a) Conduction
(b) Convection-
(c) Inversion
(d) Radiation
157. Which of the following crops needs maximum water per hectare?
(a) Barley
(b) Maize
(c) Sugarcane-
(d) Wheat
158. The polar diameter of the earth is shorter than the equatorial diameter by .
(a) 25 km
(b) 60 km
(c) 43 km-
(d) 95 km
159. Earth completes one rotation on its axis in
(a) 23 hours and 30 minutes
(b) 23 hours 56 minutes and 4.9 seconds-
(c) 24 hours
(d) 24 hours 1 minute and 10 seconds
160. The Earth rotates on its axis from .
(a) East to West
(b) West to East-
(c) North to South
(d) South to North
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