PRESSURE
1. The pressure exerted by air around us is known as .
2. Strength of the force is expressed by its
3. Force per unit area is called .
4. It is easier to cut with a sharp knife than with a blunt one because
5. Porters place a round piece of cloth on their heads, when they have to carry heavy loads because
6. If a force is applied on a smaller area of contact, the pressure exerted by it is-
7. Why do the pillars holding the track of Metro trains have a broader base?
8. Define Pressure. Explain why shoulder bags are provided with broad straps and not thin strap
9. Describe an activity to show that
(i) The pressure exerted by a liquid at the bottom of the container, depends on the height of its column.
(ii) Liquids exert pressure on the walls of the container.
(iii) Liquids exert equal pressure at the same depth.
10. Explain why we do not feel the atmospheric pressure.
11. Bhola was impressed by the miracle performed by baba Shyamdev, when Baba lied down on a bed of nails. The nails did not hurt him. Bhola narrated this miracle to his friend Rahul. Rahul explained to Bhola that, there is no magic or miracle here. Even he can do the same trick.
(a) Why did Rahul say that, there is no miracle in this trick? Why did Baba Shaymdev not hurt himself?
(b) Which quality is shown by Rahul here?
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Answer:
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Explanation:
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