Parineeta bro,

Why do you want to get to Nepal through India or China???? Flying to Nepal through India or China is a good idea only if you received your legal documents here based on asylum. Other than that it is better to fly to Nepal from countries other than India, the route many airlines offer. Indian Laws allow people to carry one each of electronics like laptops, camera, cell phones etc. If you have only one with you, they won't bother you, if you have more than one, they might inquire you about it.

Good Luck.