Discussion
The minimum clear (nominal) covers (in mm) to the main steel bars in footing, column, beam and slab are respectively-
Answer: B
The covers are 50, 40, 25, 20 mm for footing, column, beam and slab.
IS 456 requires a minimum of 50 mm cover in footings, because they are in contact with soil, and 40 mm to the longitudinal bars of columns. For beams and slabs under mild exposure, the usual values in design practice are 25 mm and 20 mm respectively.
The options starting with 75 mm overstate the footing value, 35 mm is not a standard beam cover, and the first option's 20 mm for beams is below the 25 mm conventionally used for main beam bars.
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