What rank should I expect if I am getting 45 in the IIT JAM Physics 2019? Can I get into IIT Bhubaneswar, Jodhpur, Indore?

The qualifying marks for IIT JAM Physics 2019 general category was 24.99 and 15,501 students appeared for the exam. The cut off varies every year depending on the institute, subject, caste, level of difficulty of the paper. But as an approximation, a decent rank lying in the 100s range can be expected to be well above the cut off marks.

The cut off for 2019 of IIT Bhubaneswar in the general category for Physics was 259 and 339 as the opening and closing ranks respectively. In IIT Jodhpur the cutoff for Physics in the general category was 304 and 401 as the opening and closing ranks respectively. The cut off for 2019 of IIT Indore in the general category was 401 for Physics.

Considering the above cut-offs, it can be optimistically said that you have a good chance of getting admission to the above-mentioned institutes.