Am doin BE mechanical first year.is netbook enough or i need a laptop?can we use cad like softwares n netbook?

NO ...u need to buy a good laptop with atleast core2duo processor and good ram of 2GB to run CAD software ... my one of the friend persuing mechanical-final year and he found a great usage of processor ,ram and graphics while doing CAD work .. and now he's doing project work on SOLIDWORKS ...so core2duo processor, even internal video graphics(not dedicated) , 2Gb ram and 160-320GB hdd will be the good option and this will cost around Rs32000-Rs35000 in which u will get T6x00 processor ,2GB DDR3 ram ,320 GB hdd a good built in speakers ,dvd-rw,wifi,bluetooth,webcam everything ...so drop the idea for Netbook and go either in ACER or LENOVO ... don't buy Dell or Compaq (HP) products ..