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Hello
It's quite difficult to predict how many questions in JEE mains comes from modern physics chapter as it keeps changing every year but if we go through past year trends then every year around question of 20 marks i.e 4 questions are asked from the chapter modern physics
some other important topics or chapters are listed below based on their weightage in past year JEE mains examination :-
PHYSICS
Heat and Thermodynamics-12 marks
Optics - 12 marks
Current Electricity- 12 marks
Electrostatics- 12 marks
Magnetics- 8 marks
You can get JEE mains chapterwise weightage for each of physics chemistry and maths by visiting our page the link for the same is given below
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https://engineering.careers360.com/articles/jee-main-syllabus-weightage/amp
Thank you
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