25
30
35
40
Answer is Right!
Answer is Wrong!
The correct answer is B. 30.
The maximum ratio of span to depth of a slab simply supported and spanning in two directions is 30. This means that the length of the span of the slab should not be more than 30 times the thickness of the slab. This is to ensure that the slab is strong enough to support the loads placed on it.
Option A is incorrect because it is too small. A slab with a span to depth ratio of 25 would not be strong enough to support most loads.
Option C is incorrect because it is too large. A slab with a span to depth ratio of 35 would be very heavy and expensive to build.
Option D is incorrect because it is not a valid option.