Biology
It was a joint team work done by around 20 students. The job was to investigate the protective action of the amino acid - proline in E. coli subjected to thermal shock.
Chemistry
Unfortunately I don't remember exactly what I did (I am writing this 2 years later) but it was most probably preparation of alum.
Physics
I think it was determination of the good old constant- g, done by me and one of my classmates Challenger Mishra. A freely falling ball intercepted three light barriers, which were connected to a PC interface named PHOENIX. The timing of interception gave the velocity and acceleration of the ball.