In flat roof of reinforced cement concrete, the recommended angle of slope, is A. Zero B. A few degrees C. 10° D. 200°

The correct answer is B. A few degrees.

A flat roof is a roof with a slope of less than 10 degrees. The recommended angle of slope for a flat roof of reinforced cement concrete is a few degrees. This is because

a flat roof with a slope of a few degrees will shed water more effectively than a flat roof with no slope. A flat roof with no slope will be more likely to collect water, which can lead to leaks and other problems.

Option A, zero, is incorrect because a flat roof

with no slope will be more likely to collect water and lead to leaks. Option C, 10°, is incorrect because the recommended angle of slope for a flat roof of reinforced cement concrete is a few degrees, not 10°. Option D, 200°, is incorrect because a flat roof with an angle of slope of 200° is not considered to be a flat roof.