The concept of 'Zone of Proximal Development' (ZPD), which describes the distance between what a learner can do without help and what they can do with help, was developed by which psychologist?

The Dandi March, also known as the Salt Satyagraha, was led by which influential leader?

Which act formally granted independence to India, marking the end of British rule?

Who was the key figure in establishing the Indian National Congress?