1Blood pressure is higher towards the feet than towards the head. Why is that?
2A fish that lives in river water finds it hard to survive in sea water. Why?
3What is meant by the pressure of a liquid? Write its formula and say what each symbol stands for.
4Three holes are made at different heights in the wall of a bottle, the bottle is filled with water, and all three holes are opened together. What is seen, and what does it prove?
5A narrow glass and a wide tank both hold water standing to a depth of 1 m. Is the pressure on their bases equal or different? Give the reason.
6Why are the bases of dams and water tanks built thick?
7Why is a household water tank placed at the highest point of the house?
8Why is the base of a bottle used for mercury made thicker than the base of a bottle for other liquids?
9The water in a tank stands 4 m deep. What pressure does it give on the base? Take the density of water as 1000 kg/m³ and g as 9.8 m/s².
10Why must a diver wear a special suit when going down into the deep sea?