10) , The depression of water table in a well due to pumping will be maximum[where R is the radius of influence]

11) The devices which are installed for drawing water from the sources are called

12) Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)

13) The type of valve, which is provided on the suction pipe in a tube-well, is

14) The maximum discharge of a tube-well is about