UPSC Prelims 2004 · General Studies

Question 70: Geography

Assertion (A): West-flowing rivers of Peninsular India have no deltas. Reason (R): These rivers do not carry any alluvial sediment.

aBoth A and R are individually true and R is the correct explanation of A

bBoth A and R are individually true but R is not the correct explanation of A

cA is true but R is false

dA is false but R is true

AnswerThe answer is (c).

The assertion is true: west-flowing rivers such as the Narmada and Tapi enter the sea through estuaries, not deltas. The reason is false: they do carry sediment. They lack deltas because they run swiftly through rift valleys and down a steep coast, and the sea carries their silt away.

A. West-flowing peninsular rivers form estuaries, not deltas.
R. These rivers do carry alluvial sediment.

How you could have got this

If you were sure statement 1 is correct, (d) goes. Then judge the second statement; if it is correct too, decide whether it explains the first.

This follows an unofficial answer: UPSC has not published its key for this year, and if that answer is wrong, so is this path.

Which options go is worked out from UPSC’s key and the options, not by a model.

Why each option is right or wrong

(a) R is false, so this cannot be right.
(b) R is false, so this cannot be right.
(c) Correct: A is true but R is false.
(d) A is true, so this cannot be right.

Explanation: written by UPSC Grade, not by UPSC.

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Source: UPSC, Civil Services (Preliminary) Examination 2004, General Studies. UPSC's own paper isn't online; the words are from a published compilation. The paper on upsc.gov.in.