Give reasons for the following:

Water does not run out of a dropper unless its rubber bulb is pressed.

Give reasons for the following:

Two holes are made in a sealed oil tin to take out oil from it.

In figure below, a force F is applied in a direction passing through the pivoted point O of the body. Will the body rotate? Give reason to support your answer.

When does a man exert more pressure on the floor: while standing or while walking?