अभेद्य (या बुलेट-प्रूफ) मिश्र धातु इस्पात बनाने के लिए मुख्य रूप से किस धातु का उपयोग किया जाता है?

The arrival of which commission in India triggered widespread protests, including mass hartals across the country in 1928?

Which of the following leaders was instrumental in initiating and leading India’s struggle for independence?

Which of the following viceroys of India is associated with the 'Ilbert Bill' controversy?