Assuming that you are a NEET aspirant, the weightage will be as follows -

Usually Mechanics has the highest weightage in physics. There will be around 3 questions from laws of motion, 2 from Solids and Fluids mechanics, Rotational Motion - 3,

Then Magnetic effects of electric current and magnetism will have 3-4 questions, Modern Physics covers 7 questions, Thermodynamics again has 3 qsns, Current Electricity - 3, Ray Optics - 3, Wave Optics - 3 , rest there will be 0-2 qsns from other remaining chapters like elasticity, surface tension, wave nature, oscillations, circular motion, etc.

Refer to the sites below to know in more detail..

https://medicine.careers360.com/articles/neet-chapter-wise-weightage-and-important-topics

https://engineering.careers360.com/articles/jee-main-syllabus-weightage

Feel free to ask in the comments section if you want weightage of physics in some another exam ..

Best wishes. thankyou.

Vasanth, you haven't mentioned the entrance examination you are enquiring about. But we do see that you are a Medicine aspirant. If this is about NEET, here you go: The important topics are Mechanics, ElectroDynamics, Modern Physics, Heat and Thermodynamics, Optics, Simple Harmonic Motion, Waves. Formulae form an integral part of your preparation. The important topics are Optics, Ray Optics, Optical Instruments, Wave Optics, Electronic Devices, Electrostatics, Electric Charges and Fields, Thermodynamics, Electrostatic Potential, Current Electricity, Electromagnetic induction, Alternating current, Dual Nature of Radiation and Matter. Highest weightage goes to Optics at 10%. Thermodynamics, Electrostatics, Electronic devices share 9%. Current Electricity and Electromagnetic induction, Alternating current take 8%. Dual Nature of Radiation gets 6% while Motion systems of rigid particles and body and Magnetic effects of Currents, Electromgentic waves and Magentism get 5%. Work, Energy and Power take 4%, Atoms and nuclei, Oscillation and Waves, Properties of Bulk Matter, Laws of Motion and Kinematics share 3% and the rest of the topics carry 2% weightage. You can read our article for more information: https://medicine.careers360.com/articles/neet-chapter-wise-weightage-and-important-topics . But if this is not regarding NEET, please do let us know and we shall help you with relevant information.