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UPSC CDS Answer Key 2018 with QUESTIONS for Paper 2 (General Knowledge)

   By GK Planet Team        Sunday, 4 February 2018

UPSC CDS 1 2018 GK Answer Key

Directions :The following seven[7] items consists of two statements, Statement I and Statement II. Examine these two statements carefully and select the correct answer using the code given below.
Code :
[a] Both the statements are individually true and Statement II is the correct explanation of Statement I
[b] Both the statements are individually true but Statement II is not the correct explanation of Statement I
[c] Statement I is true but Statement II is false
Statement I is false but Statement II is true

Q.1) Statement I :
By far the most common topographic form in a Karst terrain is the sinkhole
Statement II :
Topographically, a sinkhole is a depression that VARIES in depth from less than a matter to few hundred meters.
Answer B

A sinkhole is a hole in the ground that forms when water dissolves surface rock. Often, this surface rock is limestone, which is easily eroded, or worn away, by the movement of water.
In a landscape where limestone SITS underneath the soil, water from rainfallcollects in cracks in the stone. These cracks are called joints. Slowly, as the limestone dissolves and is carried away, the joints widen until the ground above them becomes unstable and COLLAPSES. The collapse often happens very suddenly and without very much warning. Water collects in these collapsed sections, forming sinkholes.

Sinkholes also form when the roofs of caves collapse. Sinkholes are often funnel-shaped, with the wide end open at the surface and the narrow