*The branch of science concerned with the nature and properties of matter and energy
Ans : Physics
*Branches of physics are Dynamics,Thermody namics, Mechanics, Optics, Acoustics, Electronics, Astrophysics, Nuclear physics.

*Anything that possesses weight and occupies space is - Matter
*7 states of matter Solid, Liquid, Gas, Plasma, Bose Einstein Condensate, Fermionic condensate, Quark Gluon Plasma.
*Matter that has definite shape and volume
Ans : Solid
*Matter that doesn’t have definite shape, but has definite volume - Liquid
*Matter that doesn’t have definite shape and volume, but occupies the shape of container
Ans : Gas
*Fourth state of matter - Plasma
*Fifth state of matter - Bose-Einstein Condensate
*At ultra high temperature matter exist in plasma form.
*Molecules are seen in most irre..................
* Reflection is a phenomenon of bouncing back of light when a beam of light falls on a surface.
* Refraction is the bending of light when a ray of light travels from one medium to another.
*Due to change of medium, the phase velocity of the wave is changed but its frequency remains constant
*When a scale is immersed in a glass of water, it seems to be bended due to - refraction.
*Star appears to be twinkling due to -Refraction
*Optical illusion which is observed usually in deserts and highways on hot summerdays -Mirage
*The phenomenon of mirage in deserts is due to - Refraction  
*Fata Morgana is a term associated with -Mirage
*Snell’s law is related with Refraction.
*The tank appears shallow than its actual depth due to- Refraction
*Device which works by the principle of reflection and refraction 
Ans :  Periscope
*The measure of optical density of the m..................
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