Which of the following is not an example of muscular force?

How does the pressure of a liquid depend on its depth? Draw a labelled diagram to show that the pressure of a liquid (say, water) depends on its depth.

Explain why the walls of a dam are thicker near the bottom than at the top.

Which of the following is not an example of the force of gravity?

When we press the bulb of a dropper with its nozzle kept in water air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is due to :