Hello  ankit ,

As you asked about physical science course along with computer science or chemistry.  So I will clearify things one by one.

Physical Science with cs:

BSc physical science has physics, chemistry, maths, computer science as it's subjects.

Whereas Bsc physical science is a course in which you have to study 4 subjects in every semester. It has subjects like Physics , Chemistry and Mathematics.

Hope it helps. 

Thank you :)