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Q: Sand generally contains salt if it is obtained from ...........
  • A. nala beds
  • B. river beds
  • C. sea beds
  • D. All options are correct
Correct Answer: Option C - Sea sand – As it obtained from sea it contain salt, which is used in attracting moisture from atmosphere. • Such absorption causes dampness and disintegration of work. • It is generally not used for engineering purpose due to its retard setting action of cement.
C. Sea sand – As it obtained from sea it contain salt, which is used in attracting moisture from atmosphere. • Such absorption causes dampness and disintegration of work. • It is generally not used for engineering purpose due to its retard setting action of cement.

Explanations:

Sea sand – As it obtained from sea it contain salt, which is used in attracting moisture from atmosphere. • Such absorption causes dampness and disintegration of work. • It is generally not used for engineering purpose due to its retard setting action of cement.