561: Which one of the following is the correct sequence of the given hills starting from the north and going towards the south?
(a) Nallamalai Hills-Nilgiri Hills-Javadi Hills-Anaimalai Hills
(b) Anaimalai Hills-Javadi Hills-Nilgiri Hills-Nallamalai Hills
(c) Nallamalai Hills-Javadi Hills-Nilgiri Hills-Anaimalai Hills
(d) Anaimalai Hills-Nilgiri Hills-Javadi Hills-Nallamalai Hills
562: Sun's halo is produced by the refraction of light in
(a) Water vapour, in Stratus clouds
(b) Ice crystals in Cirro-Cumulus clouds
(c) Ice crystals in Cirrus clouds
(d) Dust particles in Stratus clouds
Explanation:
Sun's halo is produced by the refraction of light in Ice crystals in cirrus clouds.
563: Why are dewdrops not formed on a cloudy night?
(a) Clouds absorb the radiation released from the Earths surface.
(b) Clouds reflect back the Earths radiation.
(c) The Earths surface would have low temperature on cloudy nights.
(d) Clouds deflect the blowing wind to ground level.
Explanation:
Dew is a type of precipitation where water droplets form on the ground, or on objects near the ground in a process called condensation of moisture. The favorable weather elements for dew include clear skies, light wind, decent soil moisture, and low night-time dew point depressions.
Dew forms when the temperature becomes equal to the dew point. This often happens first at ground level for two reasons. First, longwave emission causes the earth's surface to cool at night.Cloud cover prevent this from happening as it reflect's earth's radiation.
Condensation requires the temperature to decrease to the dew point. Second, the soil is often the moisture source for the dew. Warm and moist soils will help with the formation of dew as the soil cools overnight.
Source: https://www.weather.gov/source/zhu/ZHU_Training_Page/fog_stuff/Dew_Frost/Dew_Frost.htm
564: In the structure of planet Earth, below the mantle, the core is mainly made up of which one of the following?
(a) Aluminium
(b) Silicon
(c) Iron
(d) Chromium
Explanation:
The Earth has an outer silicate solid crust, a highly viscous mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core.
Seismic measurements show that the core is divided into two parts, a solid inner core with a radius of ~ 1220 km and a liquid outer core core extending beyond it to a radius of ~ 3400 km. the solid inner core was discovered in 1936 by Inge Lehmann and is generally believed to be composed primarily or iron and some nickel.
In early stages of Earth's formation about 4.5 billion years ago, melting would have caused denser substances to sink toward the center in a process called planetary differentiation, while less-dense materials would have migrated to the crust. The core is thus believed to largely be composed of iron (80 %0) along with nickel and one or more light elements, whereas other dense elements, such as lead and uranium, either are too rare to be significant or tend to bind to lighter elements and thus remain in the crust. some have argued that the inner core may be in the form of a single iron crystal.
565: Which one of the following is not a Bioshphere Reserve?
(a) Panchmarhi
(b) Agasthyamalai
(c) Nallamalai
(d) Nilgiri