In case of flat slab, the minimum thickness of slab shall be : 

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UKPSC JE Civil 8 May 2022 Official Paper-I
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  1. 100 mm
  2. 115 mm
  3. 125 mm
  4. 130 mm

Answer (Detailed Solution Below)

Option 3 : 125 mm
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Explanation:

Thickness of flat slab:

As per CI 31.2.1 of IS 456:2000, 

(i) The thickness of the flat slab shall be generally controlled by considerations of span to effective depth ratios.

(ii) Span to effective depth ratios shall be applied directly; otherwise, the span to effective depth ratios obtained in accordance with provisions in CI 23.2 of IS 456:2000  shall be multiplied by 0.9. For this purpose. the longer span shall be considered. The minimum thickness of the slab shall be 125 mm. 

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