SSC MTS EXAM

Detailed explanation-1: -Acoustics is a branch of physics that deals with the study of mechanical waves in gases, liquids, and solids including topics such as vibration, sound, ultrasound and infrasound.

Detailed explanation-2: -Optics. Optics is a significant Science branch of physics that studies light and its properties. Optics focuses on studying behaviour, properties of light, its interactions with matter and the changes in these behaviours and interactions. The branch studies the behaviour of visible, ultraviolet, and infrared light.

Detailed explanation-3: -relativistic mechanics, science concerned with the motion of bodies whose relative velocities approach the speed of light c, or whose kinetic energies are comparable with the product of their masses m and the square of the velocity of light, or mc2.