Physics Spl

You have not written about the state where you wish to pursue B.Tech course. However, on the basis of your 12th marks you can get admission in B.Tech courses in the following universities.
1. LPU Phagwara
2. SRM University
3. Chandigarh University

You have to study chemistry in B.Sc. Zoology (Hons. ) but not Physics. For detailed syllabus, refer this link:
https://www.ugc.ac.in/pdfnews/7639004_B.Sc.-Hons-Zoology.pdf

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No, it's not compulsory. As per JEE Mains eligibility criteria, candidates should have obtained a minimum of 75% marks in class 12 or equivalent exam or they must be in the top 20 percentile in their class 12th examination. For SC/ ST, the eligibility is to obtain a minimum of 65% marks in class 12 or equivalent. Therefore, it is not necessary to obtain 75% marks in PCM in 12th.

Hi,
It doesn't mean that after doing B.Sc in physics you can't get engineering type of job. Yes, obviously you will get. But one thing is that after doing B.Tech your opportunity will be much more broader than the previous one & you will get a stamp of as an engineer which will be helpful for you for future betterment. So, my suggestion is that after giving the entrance exam if you will get a Tier 1/2 type college then go for B.Tech & also if you are having financial backup support. Otherwise, go for B.Sc.