Air Exerts Pressure

Q. With the increase in speed of wind, air pressure ___________.

1. first increases and then decreases
2. remains same
3. increases
4. decreases

Q.

How can the floating of a human body be explained?

Q. The picture shows tree line along the sea coast on an island near the equator. As shown, the top of the tree is bent in one direction during the day. Are the trees bent towards the sea or away from it? Explain. [3 MARKS]

Q.

As we move to higher altitude the pressure exerted by air

1. decreases

2. increases

3. remain same

4. cannot say

Q.

Do humans naturally float?

Q.

Explain why atmospheric pressure decreases as we go higher up above the earths surface.

Q. A paper ball kept on the mouth of an empty plastic bottle will be pushed out if we press the bottle because:

1. The air pressure in the bottle is greater than the outside pressure.
2. The air pressure in the bottle is equal to the outside pressure.
3. The mass of paper ball and plastic bottle is equal.
4. The air pressure in the bottle is lower than the outside pressure.

Q. Which of the following is not affected by pressure difference?

1. Blowing of winds.
2. A vacuum cleaner used for cleaning.
3. Drinking a soft drink through a straw.
4. The motion of the Earth around the Sun.

Q.

In the given figure, two balloons are suspended freely by two light threads. Initially, they are at a distance of 10 cm. When we blow air in the space between the two balloons, the distance between them will be:

1. Equal to 10 cm.

2. Less than 10 cm.

3. Equal to 20 cm.

4. More than 10 cm.

Q. Atmospheric pressure _________ with ________ in altitude.

1. decreases, increase
2. increases, increase
3. decreases, decrease
4. remains constant, increase

Q. Given are three natural phenomena - hurricane, tornado, volcano. Which of the following is not caused by a difference in the air pressure?

1. Only hurricane and tornado.
2. Only tornado and volcano.
3. Only tornado.
4. Only volcano.