Unit-7          Classification of elements                

Ø  The systematic arrangement all elements into different groups according to their similarities and dissimilarities is called classification of elements.

Unit-6                 Electricity and Magnetism             

Ø Electricity is a form of energy produced due to the flow of electrons through a conductor or the change in number of electrons in a body.

Ø There are two forms of electricity:

                         I.   Static electricity:- Electricity produced due to change in number of electrons in a body which does not transfer from one place to another is called static electricity.

      Unit-5                              Light                                                       

Ø            Light is a form of energy which creates sensation of vision.

·       Lens:-

Unit-4                                       HEAT                                               

Ø  Heat is a form of energy that gives sensation of warmth.

Ø  Heat is the total kinetic energy of molecules of a system.

Ø  It’s SI unit is joule & CGS unit is calorie.  1 calorie =4.2 joule

Ø  It’s formula :- Q = msdt

Ø   One calorie heat energy is defined as the amount of heat energy required to raise the temperature of one gram of pure water through one degree Celsius ( 1⁰C )

# Effects of heat :-

    i. It can changes the temperature of body                     ii. It can changes the size of body.

Unit-3                                                ENERGY                             Class:- 10

Ø  Energy is the capacity of doing work. It’s SI unit is joule.

Ø Pressure is defined as the force acting normally over the surface of unit area.

Ø Pressure (P) =  Force / Area

Ø SI unit is Nm^-2 ( Newton per meter square ) or Pascal ( Pa)