some of the branches of physics are being given below:
Mechanics

 This branch deals with the bodies at rest and the bodies in motion.

Heat and Thermodynamics

It deals with heat engines and refrigerators.

Electromagnetism 

    It deals with generators and motors and the electromagnetic waves.

Optics 

It deals with law a of light and the optical instruments like telescope,microscope etc.

Acoustics

 It deals with effects of sound waves and their applications.

Nuclear Physics

It deals with nuclei of the atoms, fission and fusion.

Particle Physics

 It deals with the smallest Particles of which the matter is composed

solid state physics

 Under this topic we study the structures and properties a of solids.

Plasma Physics

 It deals with the study of plasma which is fourth state of matter.

10. Quantum mechanics

a theory based on the idea that most physical quantities like energy, angular momentum can take up only certain discrete values and cannot vary continuously.