Thanks to immi help posts, I was able to prepare well for the interview. I would like to give back, by sharing my experience as follows.
Sep 21 Bio metric
Sep 24 Monday - Visa Interview
Sep 25 Tuesday -Morning - Admin processing
Sep 25 Tuesday -Evening - Visa issued on website.
Sep 26 Wednesday -Afternoon - Passport ready to be picked up.
I used this site to track both, visa approval and passport,
http://www.ustraveldocs.com/in/in-niv-passporttrack.asp#options
I had a mistake on my DS160, that I was able to update the same day and appear for my biometric. Off course this can be a nerve wracking experience, please review each and every information on your DS-160, few weeks prior to interview.
On the day of interview, VO asked the following questions:
1. Kindly provide your 797A.
2. Kindly provide your previous 797A (I had an amendment made early this year, due to new job in same company).
3. What is your designation ?
4. Which project are you currently working on ?
5. What is your salary ?
6. Is this your first time getting H1B visa ?
A: This is my extension, of previously approved H1B.
7. Which visa did you had prior ? ---Checked old passport for F1 Visa.
8. When did you graduate ?
9. What did you do after your graduation before you got your H1 Visa ?
A: Mentioned I was on OPT.
10. Can you provide OPT Card ?
11. How long did you work on OPT ?
12. Do you know your rights, when you filled your DS-160 application ?
Your Visa is approved, we will let you know, she kept the passport.
I was a little concerned when she said we will let you know, but everything worked out well. The interview lasted for about 5-7 minutes.
Kindly wear formals to interview, if you are appearing for work Visa. Be confident, and stay calm.