The correct answer is B. 425.
The number of bricks required for one cubic metre of brick masonry depends on the type of brick, the mortar used, and the type of bond used. For a standard brick size of 215 x 102 x 65 mm and a standard mortar joint thickness of 10 mm, the number of bricks required for one cubic metre of brick masonry is 425.
Option A is incorrect because it is the number of bricks required for one cubic metre of concrete masonry. Option C is incorrect because it is the number of bricks required for one cubic metre of rubble masonry. Option D is incorrect because it is the
number of bricks required for one cubic metre of stone masonry.The number of bricks required for one cubic metre of brick masonry can be calculated using the following formula:
Number of bricks = 1 / (Volume of one brick) x (1 + Mortar joint thickness / Brick length) x (1 + Mortar joint thickness / Brick width)
For a standard brick size of 215 x 102 x 65 mm and a standard mortar joint thickness of 10 mm, the number of bricks required for one cubic metre of brick masonry is:
Number of bricks = 1 / (215 x 102 x 65) x (1 + 10 / 215) x (1 + 10 / 102) = 425