Hi i am strictly vegetarian and looking for omega-3 dha source. i wanted to know if ala in walnuts gets converted to dha sufficient well in our body?

Look for algal DHA: In the US there are available sources of DHA that is derived from algae. You may be able to find a similar product in India. Ovega-3 is the brand name of one product here, and similar products are available.I'd look to the real thing and not depend on conversion.

Not really: Research suggests that only about 0.5% of ALA is converted to DHA and some people may not be able to make that conversion at all. There are vegan sources of DHA from algae. See http://chriskresser.com/why-fish-stomps-flax-as-a-source-of-omega-3 and http://www.veganhealth.org/articles/omega3 and http://www.omegavia.com/omega-3-options-for-vegans/