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Q: The minimum compressive strength of 2nd class bricks should be.................
  • A. 70kg/cm²
  • B. 90 kg/cm²
  • C. 100 kg/cm²
  • D. 120 kg/cm²
Correct Answer: Option A - First class brick – It is free from pebbles lime lump, organic matter and sodium salt. • Its colour is cherry (Red) and size 19 × 9 × 9 cm. • Its compressive strength 105 kg/cm2 and absorb water 20% of own dry weight after 24 hr immersion in cold water. Second class brick – Compressive strength of second class brick is 75 kg/cm² and it is absorb water 22% of own dry weight after 24 hr of immersion in cold water. Third class absorb water brick – Compressive strength – 35 kg/cm² – 25% of own dry weight Surface – irregular and distorted edge.
A. First class brick – It is free from pebbles lime lump, organic matter and sodium salt. • Its colour is cherry (Red) and size 19 × 9 × 9 cm. • Its compressive strength 105 kg/cm2 and absorb water 20% of own dry weight after 24 hr immersion in cold water. Second class brick – Compressive strength of second class brick is 75 kg/cm² and it is absorb water 22% of own dry weight after 24 hr of immersion in cold water. Third class absorb water brick – Compressive strength – 35 kg/cm² – 25% of own dry weight Surface – irregular and distorted edge.

Explanations:

First class brick – It is free from pebbles lime lump, organic matter and sodium salt. • Its colour is cherry (Red) and size 19 × 9 × 9 cm. • Its compressive strength 105 kg/cm2 and absorb water 20% of own dry weight after 24 hr immersion in cold water. Second class brick – Compressive strength of second class brick is 75 kg/cm² and it is absorb water 22% of own dry weight after 24 hr of immersion in cold water. Third class absorb water brick – Compressive strength – 35 kg/cm² – 25% of own dry weight Surface – irregular and distorted edge.