Has India ever competed in Olympic or World Championship track and field?

Answer 1

Yes.

At the 2008 Games in Beijing, India had 14 athletes that competed in Track and Field events:

1) Anju Bobby George - women's long jump.
2) Prameela Ganapathy - women's heptathlon.
3) Sathi Geetha - women's 4x400 meter relay.
4) Vikas Gowda - men's discus throw.
5) Harwant Kaur - women's discus throw.
6) Mandeep Kaur - women's 400 meter run and women's 4x400 meter relay.
7) Manjit Kaur - women's 4x400 meter relay.
8) Renjith Maheshwary - men's triple jump.
9) Krishna Poonia - women's discus throw.
10) J. J. Shobha - women's heptathlon.
11) Surendra Singh - men's 10000 meter run.
12) Sushmitha Singha Roy - women's heptathlon.
13) Chitra Soman - women's 4x400 meter relay.
14) Preeja Sreedharan - women's 10000 meter run.