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UPSC Civil Service Exam Questions

Q1: Mean precipitation over an area is best obtained from gauged amounts by

A arithmetic mean method

B Thiessen method

C linearly interpolated isohyetal method

D orographically weighted isohyetal method

ANS:D - orographically weighted isohyetal method

Option (D) is correct Isohyets are contours of equal rainfall. The orographically weighted isohyets are prepared by tracing paper for mountainous areas and therefore they are more accurate than linearly interpolated isohyets.



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