Irrigation, Water Resources Engineering and Hydrology MCQs

33. Irrigation water having the concentration of Na++ , Ca++ and Mg++ as 20, 3 and 1 Milli equivalent per litre respectively will be classified as__________________?

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A. low sodium water
B. medium sodium water
C. high sodium water
D. very high sodium water
✅ The correct answer is option B.

35. The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years. The probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by_____________?

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A. (0.99)10
B. 1 – (0.99)10
C. (0.9)’00
D. l-(0.9)100
✅ The correct answer is option B.

40. The ratio of the quantity of water stored in the root zone of the crops to the quantity of water actually delivered in the field is known as__________________?

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A. water conveyance efficiency
B. water application efficiency
C. water use efficiency
D. none of the above
✅ The correct answer is option B.