Air Pressure

Q.

What is the difference between air and wind?

Q. What is air pressure?

Q.

Question 18

When strong/high speed wind blows, an umbrella held upright at times gets upturned. Explain the reason.

Q.

Air moves faster between two places when the pressure difference between the places is __________.

1. less

2. zero

3. more

4. equal to the atmosheric pressure

Q.

Question 5
Explain why holes are made in hanging banners and hoardings.

Q. In which direction does air exerts pressure?

1. In all directions
2. Upward direction
3. Downward direction
4. Sideways only

Q.

Why are we not able to drink water from a straw with a small hole?

Q. An increased wind speed is accompanied by air pressure.

1. reduced
2. increased
3. the same

Q.

Pressure is exerted by solids and liquids but not by gases.

1. True
2. False

Q. A deflated balloon fitted to the mouth of an empty bottle gets inflated as soon as the bottle is dipped halfway through into a bath of hot water. Which of the following could be inferred from this activity?

1. Air expands on heating.
2. Air expands on cooling.
3. Hot air is lighter than normal air.
4. Hot air occupies lesser space than normal air.

Q.

Why do huge hoardings have holes in them?

1. To increase the air pressure difference between the two faces of hoardings.
2. To decrease the air pressure difference between the two faces of hoardings.
3. Holes have no role in increasing or decreasing the air pressure difference.
4. To give a fancy look to the hoarding.

Q.

Complete The Second Pair Such That It Shares The Same Relation As The First Pair: Breeze : Cyclone: : Drizzle:?

Q.

The horizontal movement of air is called

Q. Which of the following statement is correct about air pressure?

1. Air exerts pressure in all directions.
2. Air exerts pressure only in upward direction.
3. Air exerts pressure only in downward direction.
4. Air does not exert any pressure.

Q.

Take a tin can with a lid and fill it half with water. Heat the can on a candle flame till water boils. Let it boil for a few minutes and immediately put the lid tightly on the can. Pour fresh water over the can. You can see a shape change for the tin box. What is the reason for the change in shape?

1. Pressure inside the can is more than that of outside

2. Pressure inside the can is less than that of outside

3. Pressure inside the can is same as that of outside

4. Pressure inside the can is equal to the atmospheric pressure

Q. Explain how winds are caused and what is global wind pattern? Also comment on land breeze and sea breeze

Q.
If the boy blows air between two balloons, then in which direction will the balloons move?

1. Both balloons will move apart.
2. Both balloons will move towards each other.
3. Both balloons will swing to the right.
4. Both balloons will swing to the left.

Q.

41 When an empty glass bottle is inverted and inserted into a trough filled with water, water does not enter the bottle. Specify?

Q.

The outermost layer of the atmosphere is ______ (exosphere/troposphere).

Q. Greater the difference in air pressure, greater is the wind speed.

1. True
2. False

Q. In which of the following examples is compressed air not used?

1. Tyres of a vehicle.
2. Floating of a heavy ship.
3. Use of a syringe.
4. Blowing up balloon.

Q. Fill a bucket with water. Take a bottle with a narrow mouth and immerse it in the bucket till it fills with water. Which of the following statement(s) can be inferred from this activity?

1. Water bubbles are seen coming out of the bottle's mouth.
2. Nothing can be added to the bottle unless the air inside is removed.
3. The shape of the bottle distorts because of air pressure.
4. The bottle that initially appears empty is actually full of air.

Q. What is the definition of low pressure and high preassure?

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

Q. is the amount of moisture present in air.

1. Temperature
2. Air Pressure
3. Humidity
4. Heat

Q.

Water is used as a coolant in motor car radiators. Explain the statement.

Q. An anemometer is an instrument that measures .

1. wind speed
2. temperature
3. humidity

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

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

Q.

Question 5
Explain why holes are made in hanging banners and hoardings.

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. More than 10 cm.

3. Less than 10 cm.

4. Equal to 20 cm.