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7. | According to IS : 456 -1978, the modulus of elasticity of concrete Ec (in N/mm2) can be taken as? | |
A. | Ec = = 5700 | |
B. | Ec = = 570 | |
C. | Ec = = 5700fck | |
D. | Ec = where fck N/mm2 = 700 is the characteristic strength in | |