Dear candidate,

Yes, surely you can apply for the mechanical engineering but there are certain things that you should be aware of as they might help/come in the way of your career at the later stage.

1. See, If you opt for the civil branch for your engineering then there will be some advantages that you will get. i.e.

You will get direct admission in the 2nd year since you have completed your diploma.

During placements also, you will have the better edge because diploma holders are assumed to have better technical knowledge and there diploma+degree holders are given preference over candidates who have only complete their degree.

2. Now, if you want to take mechanical branch for your b.tech, then you will not be eligible for the lateral entry and then you have to appear freshly as the candidate who appears after 12th. In that case neither your diploma in civil will hold much value nor you will be able to extend your skills of your diploma in the degree course.

Hope the answer is helpful.

Good luck!