Basic Civil Engineering Questions and Answers – Types of Bricks
Explanation: As per IS codes, the minimum crushing strength of first class brick is 10.5 N/mm 2, second class is 7 N/mm 2 and third class is 3.5 N/mm 2. 5. Which of the following is not a feature of second class bricks? a) Have small irregularities b) Water absorption is between 20-25% c) Rectangular in shape