Answer the following in short 1. Define Pressure. Give its mathematical representation.
2. Define Thrust.
3. What are the factors on which the pressure exerted by a body depends?
4. What is Pascal. Explain briefly.
5. Why do thumb nails have a broad head and pointed tip?
6. Why do deep sea divers wear special suits?
7. Define atmospheric pressure. Give its SI unit.
8. The atmospheric pressure is so high that its almost equal to carrying seven compact cars on our head. Why don’t we get crushed under such pressure?
9. What is Karman line? What height is it found?
10.What is a barometer? Who invented the first barometer and what is it called?
Answer the following in detail 1. How are force, area and pressure related to each other? Explain with an example.
2. Give two examples of objects made to creating greater pressure which we use in our daily life and explain briefly.
3. Why do pillars of the bridge have broader base than the top?
4. Give reasons for the following:
a. Army tanks are provided with broad steel tracks called caterpillar tracks under their wheels.
b. How does high raise building having massive weight not sink into the ground?
c. Walls of the dam are made thicker at the base.
d. Astronauts wear specially designed suits in space.
5. What is lateral pressure? Explain with an example or activity.
6. List all the characteristics of liquid pressure.
7. How does atmospheric pressure change with altitude? What happens to mountaineers at high altitude?
8. Describe the function of a simple mercury barometer.
9. State the advantages of mercury with respect to water as a barometer liquid.
10.State the disadvantages of mercury barometer.