What is the difference between the excise duty and the sales tax ?

This is a very tricky question and you will have to answer accordingly. The exact answer is that when a goods move from one state to the another then you will have to pay the sales tax and when the goods come out of the industry then you will have to pay the excise duty. Do not try to go more deep. Just give this answer and keep your mouth shut. Otherwise you will have to face a series of questions which will be very difficult to answer. However if you have guts then I would definitely advice you to answer in detail.