The flexural tensile strength of M25 grade of concrete,

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The flexural tensile strength of M25 grade of concrete, in N/mm², as per IS: 456-2000 is _______

1. 0.24
2. 0.214
3. 0.35
4. 5

Correct Option: C

Flexural tensile strength = 0.7 √ f_ck
= 0.7 × √25 = 3.5 N/mm².