Hi, B.sc (H) Computer Science is a course that will have introductory Physics and Mathematics. The focus of this course will remain on Computer Science and the subjects related to it for all three years.You can read more about the course and take a look at the syllabus that has been brought into effect since 2015 from here: http://cs.du.ac.in/programmes/bsc/
B.Sc Physical science with CS is basically an applied Physical Science degree with specialization in Computer Science. You'll be studying everything from Physics, Mathematics, Economics, it will involve Computer programming languages, networking,data structures, architecture, Mechanics,Thermal physics, Wave & optics,Calculus , metrices, geometry, Differential equations etc, biology, chemistry,enviorenmental sc, English ETC.. etc in three years. Each subject is then further divided into different papers. So, if you have Physics, you have two parts of it and two papers (each having a syllabus of one main paper from Hons. course). After completing this course is you can choose any specialization for your M.Sc or MS.
You can check the syllabus from here: http://www.du.ac.in/du/uploads/Syllabus_2015/B.Sc.%20Prog.-Physical%20Sciences%20Applied%20Physical%20Sciences.pdf
Good luck
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