किसी ध्वनि तरंग का धीमापन (मृदुता) या प्रबलता मुख्य रूप से किसके द्वारा निर्धारित होती 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?