Define power and explain its units .

Define power of a Lens. Write its S.I. Unit.

Define collision .Explain its types with examples.

Define and explain Hess 's law with an example.

Define biodiversity and explain how biodiversity is important for mankind.

Define and explain the common -emitter current amplification factor beta.

Define and explain the term co -ordination sphere.

Define and explain electrochemical equivalent.How is it related with chemical equivalent of the substance ?

Define Resolving power of an optical instrument.