M.Sc

Hi friend,
Yes, you can do M.Sc after completing B.com. But i can say that this option is not good for you. Because most of the science stream students do for M.Sc., so you can do for the LLB, M.Com and M.A after completing B.Com. M.Com is the the best option after completing B.Com. In M.Com, good job opportunities are there. You also have a good further scope about your future.
ALL THE BEST TO YOUR FUTURE.

M.Sc. Nursing is a two-year program which specializes in many branches; for example: Obstetrics and Gynaecology Nursing, etc. The mode of admission is mostly through entrance examination or through marks obtained in qualifying examination and personal interview.
The average tuition fee for the entire course ranges between 1.30 Lakhs INR to 2.80 Lakhs INR.

I think DTU doesn't offer M.Sc programs:
Kindly visit this link:
http://dtu.ac.in/Platforms/academic_PG/choice.htm

Good colleges/universities for M.Sc. in microbiology are:
Fergusson College, Pune
Oxford College of Science
Ramnarain Ruia College, Mumbai
St. Francis Degree College For Women
Garden City College
Lady Brabourne College
Kristu Jayanti College, Bengaluru
Ganpat University, Mehsana
Marwadi University
SIES College of Arts, Science, and Commerce, Mumbai
CMS College of Science & Commerce, Coimbatore.

Yes, if you fulfil the eligibility criteria:
This course is a research based graduate degree. Candidates need to have passed graduation from a recognised university as aminimumeligibility criterion to be fulfilled for the programme. Admission to various nanotechnology colleges is either entrance exam based or merit-based.

Yes, you should pursue MS after BE in India.

You have to revise the syllabus of B.Sc.