Polytechnic

The major difference between the 2 degrees is that, BCA is a professional degree whereas B.Sc is a graduation degree. Although, both has almost equal recognition, B.Sc in Computer Science is valued more in comparison to BCA. So, pursuing a B.Sc (Bachelor in Science) will be beneficial.

Hello Jatin,
Yes, you can surely seek admission in B.Sc course after your Diploma. UP government recognises Diploma as equivalent to class 12th. You can get this certificate from your institute where you are doing Diploma. This may be required when you seek admission in B.Sc.
Best wishes to you.

Yes, many of the colleges allow this. Some of the colleges in the private sector are Lovely Professional University and Oriental College of Technology.

Hi,
It comes under UG category.

Hi Rajeev,I can say, yes if you are under the age limit and entrance qualification, if you have the both I am sure you can write the Entrance exam for the Diploma.

Yes, go for it and browse the the course which interests you.

Hi,
Please find the link below for detailed information:
https://www.shiksha.com/b-tech/course/b-e-in-mechanical-engineering-madras-institute-of-technology-chrompet-chennai-253294

Yes, you can get entry in Government College after Diploma through lateral entry.