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Q: Underburnt bricks are classified as :
  • A. third class bricks
  • B. second class bricks
  • C. first class bricks
  • D. fourth class brick
Correct Answer: Option A - Third class bricks are underburnt. They are soft and light-coloured producing a dull sound when struck against each other. • Water absorption is about 25% of dry weight. • Minimum compressive strength 3.5 N/mm2. Used– It is used for building temporary structures. • Fourth class bricks are over burnt and badly distorted in shape and size and are brittle in nature.
A. Third class bricks are underburnt. They are soft and light-coloured producing a dull sound when struck against each other. • Water absorption is about 25% of dry weight. • Minimum compressive strength 3.5 N/mm2. Used– It is used for building temporary structures. • Fourth class bricks are over burnt and badly distorted in shape and size and are brittle in nature.

Explanations:

Third class bricks are underburnt. They are soft and light-coloured producing a dull sound when struck against each other. • Water absorption is about 25% of dry weight. • Minimum compressive strength 3.5 N/mm2. Used– It is used for building temporary structures. • Fourth class bricks are over burnt and badly distorted in shape and size and are brittle in nature.