(a) When land is steep and soil is easily erodible
(b) when the crops are deeply rooted
(c) when soil of low permeability is used
(d) when water table is very low

Ans. (a) : When land is steep and soil is easily erodible
Explanation:
Sprinkler irrigation is suitable for when land is steep and soil is easily erodible.
This method is adopted when
(i) The land cannot be prepared for surface methods
(ii) Slopes are excessive
(iii) Topography is irregular
(iv) Soil is erosive
(v) Soil is excessively permeable or impermeable
(vi) Depth of soil is shallow over gravel or sand.
(vii) When seepage loss is more
(viii) When fertilizers and insecticides are to be mixed
with irrigational water.
(vix) The availability of water is difficult.