मानक विद्युत आपूर्ति नियमों के अनुसार, AC आपूर्ति की आवृत्ति में परिवर्तन घोषित आवृत्ति से ____% से अधिक नहीं होना चाहिए।

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?