10 m
20 m
30 m
40 m
Answer is Right!
Answer is Wrong!
The correct answer is: B. 20 m.
Expansion joints are provided in masonry walls to allow for movement due to changes in temperature, moisture, and settlement. The length of a masonry wall that requires an expansion joint depends on a number of factors, including the type of masonry, the climate, and the design
of the wall. However, as a general rule, expansion joints are typically provided every 20 m.Option A is incorrect because expansion joints are typically provided every 20 m, not 10 m.
Option C is incorrect because expansion joints are typically provided every 20 m, not 30 m.
Option D is incorrect because expansion joints are typically provided every 20 m, not 40 m.