161: Cloudy nights are warmer compared to clear cloudless nights, because clouds
(a) prevent cold waves from the sky from descending on Earth
(b) reflect back heat given off by Earth
(c) produce heat and radiate it towards Earth
(d) absorb heat from the atmosphere and send it towards Earth
162: The process by which metal surface is coated with thin layer of zinc is called:
(a) Vulcanising
(b) Galvanising
(c) Electroplating
(d) None of these
163: NASA'S Deep Impact space mission was employed to take detailed pictures of which comet nucleus ?
(A) Hale Bopp
(B) Halley's Comet
(C) Hyakutake
(D) Tempel 1
164: Assertion (A) :
The basic weakness of the early nationalist movement lay in its narrow social base.
Reason (R) :
It fought for the narrow interests of the social groups which joined it.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
165: Contour bunding is a method of conservation used in
(a) desert margins, liable to strong wind action
(b) low flat plains, close to stream courses, liable to flooding
(c) scrublands, liable to spread of weed growth
(d) None of the above