alleryFrequency of AC in India is:
A25 Hz
B50 Hz
C60 Hz
D100 Hz
Answer & Solution
Correct answer: B. 50 Hz
1. India's mains AC frequency is standardised at 50 Hz.
2. So one full cycle takes 20 ms; AC reverses direction every 10 ms.
3. USA uses 60 Hz; some regions use 50 Hz too. 25 Hz is historical (early traction).
_Source: syllabus Science Ch 12 §12.7 (AC in India)_
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