(i) What do you mean by resonance ? (ii) Mention any two uses of its from your daily life.

Observe your surroundings carefully and write any three situations of your daily life where you can observe lines and angles. Draw the pictures in your note book and collect some pictures.

Using Pascal's law, explain with a neat figure, the working of a hydraulic lift. Mention any one situation from your daily life where hydrostatic paradox is useful.

mention two uses of cathode ray tube in our daily life.

Describe any commercial method of preserving fish with at least one advantage. What do you mean by LTH? Give two reasons for food spoilage.

Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why?

Define oxygen dissociation curve. Can you suggest any reason for its sigmoidal pattern?

Give any two characteristics of Dye.

Draw the characteristic curve of a LED. Can you recognise any difference from the characteristic curve of an ordinary semiconductor diode?

Which of the following sentences are statements ? Give reason for your answers How far is Kolkata from your house ?