अधिकांश उच्च-तापमान अतिचालक (superconductors) निम्नलिखित में से किसके यौगिकों से प्राप्त होते हैं?

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?