वार्षिक रूप से मनाया जाने वाला 'पृथ्वी दिवस' (Earth Day) निम्नलिखित में से किस दिन मनाया 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?