Upvote:1
The ETV is perfectly fine for transiting an Airport landside. In most countries a Tourist visa is acceptable for Transit as well.
Upvote:2
I don't have a source to cite, but this is coming from my own experience.
The e-Tourist Visa is only valid if you use one of the designated airports. Bangalore BLR airport is one of them.
You can enter the country and leave the same day.
Chances are, you will not even need to use the visa for the transit. If your flight is only a few hours apart and you have both legs in the same reservation, you can. Make an airside transit at the airport. Bangalore is a modern city by Indian stands, and since you have already paid for the visa, you might as well visit the city. I am not sure if an unused e tourist visa counts towards your 2 eTV per calendar year though.