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Q: Excess of silica in the clay.................
  • A. Makes the brick brittle and weak
  • B. Makes the brick crack and warp on drying
  • C. Changes the colour of the brick from red to yellow
  • D. Improves the impermeability and durability of the brick
Correct Answer: Option A - Silica is the main component of earth bricks. Silica content in earth bricks is (50-60)%. Silica controls cracking and shrinkage. Silica content increases the strength of brick.
A. Silica is the main component of earth bricks. Silica content in earth bricks is (50-60)%. Silica controls cracking and shrinkage. Silica content increases the strength of brick.

Explanations:

Silica is the main component of earth bricks. Silica content in earth bricks is (50-60)%. Silica controls cracking and shrinkage. Silica content increases the strength of brick.