Hello Aryan

It would be difficult to provide you the exact marks required as the cutoff vary every year depending on various factors. However, previous year closing rank of IIT Roorkee for Physics was 221 for General category, 378 for OBC NCL category.
You can go through the link below and check the previous year cutoff for reference and to have an idea about the expected cutoff

 https://images.careers360.mobi/sites/default/files/jam3rdround.pdf

 https://university.careers360.com/articles/jam-cutoff

Good Luck!

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As per previous years trends cutoff ranks for Physiscs in JaM at IIT roorkee was 110 approximately under General category.

Minimum qualification marks shall be between 14.79 to 17.05 in Physiscs in General category. 

https://university.careers360.com/articles/jam-cutoff