Question

For 1^st class bricks, the water absorption capacity should not be more than ________.
1. 10%
2. 20%
3. 30%
4. 40%

Answer 1

Correct Answer - Option 2 : 20%

Water absorption for class 1 brick should not exceed 20% of its dry weight. For class II brick it should be between 22%. 

Reference: 

As per IS 1077: 1992, clause 7.2, after immersion in cold water for 24 hours, water absorption shall not be more than 20 percent by weight up to class 12.5 and 15 percent for higher classes.