Q. Based on surface tension, what is the name of the part of field capacity water?

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Q. By what type of forces the soil grains retain water on their surfaces?

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Q. How many days are generally taken to obtain field capacity after free gravity drainage?

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Q. Field capacity is different from gravity water.

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Q. What is the name of water which flows under gravity?

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Q. Which zone is the most important from an irrigation point of view?

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Q. What is the correct expression of parameter Eₐ in Penman’s equation?

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Q. Compute the total consumptive use for a drainage basin by Penman’s formula. The slope of saturation vapour pressure V/s chart at 40°C is 2.95 mm of Hg/°C and the net incoming solar radiation is 5.705 mm of evaporative water/day. Assume, Eₐ = 18.07 mm/day and Psychrometric constant = 0.49 mm of Hg/°C.

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Q. What is the consumptive use for a crop in the month of April having a consumptive use coefficient equal to 0.80 and pan evaporation is 35 cm?

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Q. The pan evaporation can also be determined by Christiansen formula.

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Q. Penman’s equation can also be used to compute evaporation from a water surface like a lake if _________

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Q. Albedo or reflection coefficient factor is used in which method?

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Q. Penman’s equation for the estimation of PET has been derived by using ___________

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Q. What are the dimensions of the standard class-A pan?

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Q. Which method involves the use of crop factor?

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Q. Determine the pan evaporation from the following data using the Christiansen method.

Extra-terrestrial radiation in cm = 47.3 cm
Coefficient of temperature(Cₜ) = 1.403
Coefficient for wind velocity (Cw)= 1.2
Coefficient for relative humidity (Cₕ) = 1
Coefficient for percent of possible sunshine(Cₛ) = 1.073
Coefficient of elevation(Cₑ) = 1.014

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Q. The monthly consumptive use is given by _____________

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Q. The average value of Eₜ/Eₚ for citrus crops?

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Q. Which method is widely used in India for the computation of consumptive use?

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Q. What is the range of reflection coefficient for close-grained crops?

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