How will my doubts be cleared in the absence of physical interactions? -

The classes will have enough interaction to get your doubts cleared. You will also have additional options:

1. A discussion forum is open in every course, where you can post your queries to be answered by peers in the class as well as mentors.
2. Review session scheduled periodically where you can ask the faculty and get your doubts clarified.
3. One-on-one sessions with mentors can be scheduled during the program.