211. The sun’s heat and light energy reaches the earth by which of the following modes of transmission?
(a) Conduction
(b) Convection
(c) Radiation-
(d) Reflection
212. At the core of the earth, the temperature is estimated to be around____.
(a) 1,000 degree C
(b) 1,200 degree C
(c) 2,000 degree C-
(d) 2,600 degree C
213. What is meant by Archipelago?
(a) Cluster of Islands-
(b) Rocks Under Seas
(c) Cluster of Small States
(d) Cluster of Stars
214. The mean radius of the earth is approximately .
(a) 3,200 km
(b) 6,400 km-
(c) 9,600 km
(d) 12,800 km
215. Of the total volume of the earth, the three layers - the crust, the mantle and the core, constitute respectively .
(a) 16.5%, 0.5% and 83%
(b) 0.5%, 83% and 16.5%
(c) 83%, 16.5% and 0.5
(d) 0.5%, 16.5% and 83%-
216. Which of the following layers of the earth is believed to have the heaviest mineral materials of highest density?
(a) Central Core-
(b) Crust
(c) Mantle
(d) Both (b) and (c) above
217. The heavier silicates named as ‘Sima’ or silica + magnesium are most abundant in the
(a) Crust
(b) Core
(c) Mantle
(d) Ocean floors-
218. The principal reason for the formation of metamorphic rocks is .
(a) Deposition of sediments
(b) Deposition of remains of plants and animals
(c) Extreme of heat and pressure-
(d) Solidification of magma
219. Which of the following regions of the world is most thickly populated?
(a) East Asia
(b) South Asia-
(c) North-West Europe
(d) North and South America
220. What is the average density of population in the world in 2013?
(a) 27 persons per sq. km
(b) 37 persons per sq. Km
(c) 45 persons per sq. km-
(d) 221 persons per sq. km
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