How many times AC supply in India reversed its direction in one second.

Frequency of an AC current implies number of complete waves present in a second. In India, the Ac current has a frequency of 50 Hertz. 50 Hertz frequency means that there are 50 waves present in a interval of one second. And we know from the previous question that in one wave current changes its direction twice, so in 50 waves it will change its direction 100 times.