Correct Answer - Option 1 : 0.12
Explanation:
CI. 26.5.2 of IS 456:2000 limits minimum steel reinforcement requirements in slabs in either direction as:
Astmin = 0.15% of gross area for Fe 250
Astmin = 0.12% of gross area for Fe 415
Minimum steel requirements in slab are based on shrinkage and temperature consideration and not on strength consideration because, in slabs, there occurs a better distribution of load effects unlike in beams, where minimum steel requirements are based on strength consideration