Find out the situations where solar pan-. els are made use of and list them:

Write down the situation where solar panels are used.

We know that heat is emitted along with light when a bulb glows. .LED lamps are better than filament bulbs for maximum reduction in the consumption of electrical energy. Explain. Are there situations where filament. bulbs are used for producing Light energy? Give examples.

Find out reasons for the situations Place some carom board coins in a pile. Using the striker, strike out the coin at the bottom. What do you observe ? What is the reason ?

Find out reasons for the situations place a small brick on a plank. When the plank is pulled suddenly the brick remains in the same position as before.

Three Galvanic cells are given: Find out the most reactive metal and least reactive metal among them.

Try to find out the answers using algebra:. 8 is added to a number and its square becomes 625 .Which is the number ?