There are two ways for you to apply for an Indian visa: Indian normal visa and Indian eVisa, each of which comes with different processing time. Take a look at each process to find out the Indian visa process that benefits you the most.
No, you are not permitted to apply in that case.
The Indian eVisa is valid for 60 days from the date of arrival in India.
Yes, you can. However, Indian eVisa can only be used by passengers coming into through 5 designated seaports such as Chennai, Cochin, Goa, Mangalore, Mumbai.
International Traveller who is visiting in India for recreation, sightseeing, casual visit to meet friends and relatives, short duration medical treatment or casual business visit can apply and use the Indian e-Tourist Visa.
Indian e-Tourist Visa is only entitled to recreation, sightseeing, casual visit (meeting friends or relatives).