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25.

When surface of transpiration is submerged under water, then potential evapotranspiration is                        
A. much more than evapotranspiration B. much less than evapotranspiration
C. equal to evapotranspiration D. equal to or less than evapotranspi-ration



26.

Unit of runoff in M.K.S. system is                        
A. cubic metre/sec B. metre/sec
C. cubic metre D. square metre



27.

The runoff increases with                        
A. increase in intensity of rain B. increase in infiltration capacity
C. increase in permeability of soil D. all of the above




28.

The area between the isohyets 45 cm and 55 cm is 100 square km and between 55 cm and 65 cm is 150 square km. The average depth of annua! precipitation over the above basin of 250 square km will be                        
A. 50 cm B. 55 cm
C. 56 cm D. 60 cm



29.

A current meter is used to measure the                        
A. velocity of flow of water B. depth of flow of water
C. discharge D. none of the above



30.

If it rains between 2 P.M. and 3 P.M. and the entire basin area just starts contributing water at 3 P.M. to the outlet, then time of concentration will be                        
A. 15 minutes B. 20 minutes
C. 30 minutes D. 60 minutes



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