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Q: Good quality sand is never obtained from
  • A. River
  • B. Nala
  • C. Sea
  • D. Gravel powder
Correct Answer: Option C - See sand is not used in building construction because it contains sea salts organic impurities and other harmful elements which cause the corrosion of reinforcement.
C. See sand is not used in building construction because it contains sea salts organic impurities and other harmful elements which cause the corrosion of reinforcement.

Explanations:

See sand is not used in building construction because it contains sea salts organic impurities and other harmful elements which cause the corrosion of reinforcement.