When surface of transpiration is submerged under water, then potential evapotranspiration is________________?

Related Mcqs:

1. The amount of irrigation water required to meet the evapotranspiration needs of the crop during its full growth is called________________?

   A. effective rainfall
   B. consumptive use
   C. consumptive irrigation requirement
   D. net irrigation requirement

2. The stage of river carrying a discharge of Q m7sec at a point is 10 m and slope of water surface is (1/4000). The discharge of a flood at the same point and same stage of 10 m with a water surface slope of(l/1000) will be________________?

   A. V2 Q m3/sec
   B. 0.5 Q mVsec
   C. 2 Q m3/sec
   D. 4 Q m3/sec

3. The most suitable chemical which can be applied to the water surface for reducing evaporation is________________?

   A. methyl alcohol
   B. ethyl alcohol
   C. cetyl alcohol
   D. butyl alcohol

4. When the upstream face of a gravity dam is vertical, then the intensity of water pressure at the water surface and at the base respectively will be_______________?

   A. 0 and wH212
   B. wH2/2and wH2/3
   C. wH and 0
   D. OandwII

   where w is unit weight of water and H is the depth of water

5. Under the same conditions, which of the following shapes of water surface will give the highest rate of evaporation ?

   A. flat water surface
   B. convex water surface
   C. concave water surface
   D. independent of shape of water surface

6. Rate of evaporation from a water surface increases if_________________?

   1) difference of vapour pressure between water and air is increased
   2) velocity of wind is decreased
   3) concentration of soluble solids in water is decreased
   The correct answer is?

   A. (1) and (i2)
   B. (2) and (3)
   C. (2) and (3)
   D. (1), (2) and (3)

7. The ratio of average values of shear stresses produced on the bed and the banks of a channel due to flowing water is________________?

   A. less than 1
   B. equal to 1
   C. greater than 1
   D. equal to zero

8. Main purpose of mean water training for rivers is________________?

   A. flood control
   B. to provide sufficient depth of water in navigable channels, during low water periods
   C. to preserve the channel in good shape by efficient disposal of suspended and bed load
   D. all of the above

9. For supplying water to rabi crop, kharif crop and sugarcane, the channel is designed for a capacity equal to the greater of the water requirement of_______________?

   A. rabi or kharif
   B. rabi and kharif or sugarcane
   C. rabi and sugarcane or kharif and sugarcane
   D. rabi or kharif or sugarcane

10. 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__________________?

    A. water conveyance efficiency
    B. water application efficiency
    C. water use efficiency
    D. none of the above