Explain the term symbol. State a reason why- the symbol of calcium is Ca and of copper is Cu.

Explain the symbols used in the equation of state.

Explain the term mechanical advantage. State its unit.

Write the symbols for all physical states.

State the reason why testes lie outside the abdomen in a scrotum?

State the reason, why GaAs is most commonly used in making of a solar cell.

What are the symbol of the following element ? Copper

Explain in detail the symbolic representation of electrochemical cells.

What is the oxidation state of : Copper is Cu_2O

Explain the term 'dry ice'. State its application. Give three reasons why carbon dioxide finds application in fire extinguishers.