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Q: Pick up the correct statement from the following
  • A. Sand obtained from pits, is washed to remove clay and silt
  • B. Sand obtained from flooded pits, need not be washed before use
  • C. Sea shore sand contains chlorides which cause efflorescence
  • D. All option are correct
Correct Answer: Option D - General pits contains all particle size i.e. sand, silt & clay also. So when the sand is obtained by the pits, it is necessary to wash that sand so as to remove the fine soil particles like silt & clay. In case of flooded pits, sand is not needed to be washed because during flood that soil is already washed. When the sand is obtained by the sea shores the chloride & alkali content is very high which causes efflorescence.
D. General pits contains all particle size i.e. sand, silt & clay also. So when the sand is obtained by the pits, it is necessary to wash that sand so as to remove the fine soil particles like silt & clay. In case of flooded pits, sand is not needed to be washed because during flood that soil is already washed. When the sand is obtained by the sea shores the chloride & alkali content is very high which causes efflorescence.

Explanations:

General pits contains all particle size i.e. sand, silt & clay also. So when the sand is obtained by the pits, it is necessary to wash that sand so as to remove the fine soil particles like silt & clay. In case of flooded pits, sand is not needed to be washed because during flood that soil is already washed. When the sand is obtained by the sea shores the chloride & alkali content is very high which causes efflorescence.