Correct Answer:
Option A - Class-15–As per IS : 1077 1992 for class-15 the average compressive strength not less than (15.0 N/mm²) and water absorption of these bricks less than 15%, According to data A2 and A4 are used for the wall construction.
A. Class-15–As per IS : 1077 1992 for class-15 the average compressive strength not less than (15.0 N/mm²) and water absorption of these bricks less than 15%, According to data A2 and A4 are used for the wall construction.