Chandigarh University (CU)

Yes, absolutely. Chandigarh University is adjudged as the best private university in North India and the best option in Punjab for CSE which is absolute because of its curriculum and academic achievements. Compared to many universities out there, CU is not that costly though can be said as moderate.
http://www.cuchd.in/uie/computer-science-and-engg/

Yes, you can go with anything as long as you are comfortable with Chandigarh University and as you are from SC category, you may also get a scholarship.
http://www.cuchd.in/language-literture-and-culture/bachelor-of-arts.php

Hindustan University would be a better option over Chandigarh university if you have already got selected for Hindustan University then you are on a good path.

Chandigarh University is adjudged as best university for aerospace in Punjab and third best private university in North India within 6 years.
So, it would be a good option.
http://www.cuchd.in/engineering/be-aerospace.php

Summer internships are offered to Chandigarh University for the first university by the university itself and from the second-year students have to get their own internships by applying for companies through a request form of HOD. But, the industrial exposure is good during academics.

Foreign languages are offered by Chandigarh University to students of BA (any department) only.
http://www.cuchd.in/language-literture-and-culture/bachelor-of-arts.php

Yes, any student who has a valid in 10+2 board with a percentage of 60 is allowed to take admission for BBA in Chandigarh University.
www.cuchd.in/management/

BA LLB used to be the best course offered by PU but it was a few years back. Now, the scenario has changed that it is failing to meet the standards of the outer world. So, Chandigarh University would be a bit better option.
http://www.cuchd.in/legal-studies/ba-llb-integrated.php

To get a government job in the field of aerospace engineering, you need to take various prescribed entrance exams such as GATE which are widely accepted by PSUs and MNCs.