Irrigation Engineering
Presence of tail water in a gravity dam
i) increases the principal stress
ii) decreases the principal stress
iii) increases the shear stress
iv) decreases the shear stress
The correct answer is

(ii) and (iii)
(i)and(iv)
(ii) and (iv)
(i) and (iii)

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Irrigation Engineering
Pick up the correct statement from the following mention

Gravity water is harmful to crops
All of these
Capillary moisture held in the soil pores against gravity by surface tension, is utilised by plants
Hygroscopic water remains attached to soil molecules by chemical bond

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