While considering the design of R.C. buildings for providing ductility, the minimum grade of concrete limited by the Indian Code is _________
(a) M 10
(b) M 20
(c) M 35
(d) M 50
I have been asked this question by my college professor while I was bunking the class.
Question is taken from Earthquake Resistant R.C. Buildings in chapter Earthquake Resistant Buildings of Construction & Building Materials