Hi Pramila,
Be sure to carry all your documents and the invitation letter from the US company. Make sure your photos are of the specified dimensions and background. They will ask you why you are going, how long are you planning to stay and who is going to sponser you all that. They will also ask about your previous experience, how long have you been working with the present company etc.
Just be confident and reply everyting calmly.
All the best.