For the following questions answer them individually
Arrange the following in chronological order:
I. Dandi March
II. Simon Commission
III. Poona Pact
IV. Gandhi Irwin Pact
Consider the following pairs;
Tributary Main River
1. Chambal Yamuna
2. Sone Narmada
3. Manas Brahmputra
Which one of the pairs given above is/are correctly matched?