What is meant by the term potential energy ? Give its two examples.

What do you mean by the term potential energy ? Give some examples of bodies possessing potential energy ?

What is meant by a renewable source of energy ? Give two example of renewable sources of energy.

(i) What is meant by the term hydrated salt? (ii) Give two examples of hydrated salt which are white and state their chemical formula.

What is meant by a non-renewable source of energy ? Give two example of non-renewable sources of energy.

What is meant by simple harmonic motion ? Give any two examples. Write its differential form.

Answer the following question : What is meant by complex compounds ? Give two examples.

What is meant by the term electric potential difference ?

What is meant by the term physical change? Give an example.