In JEE MAIN 2019 of both Jan and April exam, from which topics the the questions asked are tough in Physics
In general the toughest questions are asked from rotational mechanics, simple harmonic motion, waves, electrostatics and newton's laws of motion whereas the questions asked from semiconductors and modern physics are much easier and also are less time consuming than the other questions. Hope this helps.
For knowing the difficulties wise paper analysis of jEE.mains paper 2019 you can refer to the link below.
https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-analysis/amp
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