56: Which one of the following layers of the atmosphere is responsible for the deflection of radio waves ?
(a) Troposphere
(b) Stratosphere
(c) Mesosphere
(d) Ionosphere
Explanation:
In the lower part of the Thermosphere region between 100 to 400 km, ionisation of atmospheric gases takes place. This layer is called Ionosphere. There is a peak concentration of ionized particles at 250 km, that is why this layer deflects radio waves.
57: Which one of the following countries of South-West Asia does not open out to the Mediterranean Sea?
(a) Syria
(b) Jordan
(c) Lebanon
(d) lsrael
Explanation:
The countries with coastlines on the Mediterranean Sea are Albania, Algeria, Bosnia-Herzegovina, Croatia, Cyprus, Egypt, France, Greece, Israel, Italy, Lebanon, Libya, Malta, Morocco, Monaco, Montenegro, Northern Cyprus (recognized only by Turkey), Palestine, Slovenia, Spain, Syria, Turkey, and Tunisia.
Hence Correct option is B.
59: In India, in which one of the following types of forests is teak a dominant tree species?
(a) Tropical moist deciduous forest
(b) Tropical rain forest
(c) Tropical thorn scrub forest
(d) Temperate forest with grasslands
Explanation:
Teak tree naturally occurs in Tropical moist deciduous forest.
Hence first option is Correct.