Winds and Pressure Difference

Q.

Does air exert pressure on us?we doesn't feel anything

Q. Why the balloon come close when air is blown between them.

Q.

Select the correct statement with respect to the given figure.

1. Water will not flow

2. Water will flow from B to A

3. Can’t be said

4. Water will flow from A to B

Q. When high speed wind blows, an umbrella held upright at times gets upturned due to above the umbrella.

1. high pressure
2. low pressure
3. low temperature
4. high temperature

Q.

State two experiences that made you think that air exerts pressure.

Q.

In the given figure of a cyclone, what will be the direction of wind flow?

1. No wind flows

2. Region I to Region II

3. Region II to Region I

4. Wind blows up

Q.

What is the magnitude of air pressure in pascals in the SI system?

Q. When air blows faster, without obstruction, then:

1. air pressure decreases
2. air pressure increases by same amount

3. air pressure remains the same

4. air pressure increases

Q. While drinking a soft drink with the help of a straw the pressure in the straw is _____ and the pressure in the bottle is ________.

1. High, less
2. Less, less
3. High, high
4. Less, high

Q. Rohit blows air with a straw near the opening of another straw which has its other end in a soft drink bottle as shown in the figure. Which of the following best explains the reason for the rise in the level of the drink?

1. Blowing of air warms up the air inside the straw.
2. Blowing of air decreases the pressure over the open end of the straw.
3. Blowing of air increases the pressure on the surface of the drink in the bottle.
4. Blowing of air increases pressure over theopen end of the straw.

Q. Suggest two methods to find out wind direction at a given place.

Q.

Give reason-

A gas exerts pressure on the wall of the container.

Q. When high speed wind blows, an umbrella held upright at times gets upturned due to above the umbrella.

1. high pressure
2. low pressure
3. low temperature
4. high temperature

Q. A piece of paper is kept on the table. You have to lift it from the table by blowing high-speed air over it. In which direction will you blow the air?

1. Sideways
2. In the upward direction
3. In the downward direction
4. In the upward direction below the table

Q.

Sushweta and Garima went to the railway station to see off Himanshu, who was going to his college. Garima told Sushweta that if she got close to the tracks when the train is passing by, she would feel a pull:

1. Towards the train

2. In the upward direction

3. Can’t be said

4. Away from the train

Q. An experiment is conducted to understand air pressure. Two identical balloons are filled with little water and blown. Then they have tied to a string some distance apart. What happens when air is blown in between them?

1. They move closer to each other.
2. They move further apart.
3. One moves up and other moves down
4. none of the above

Q. How does blowing inside the bottle make the paper ball come out ?

1. Air pressure near the mouth of the bottle drops and greater air pressure inside the bottle pushes the paper ball out.
2. Air pressure near the mouth of the bottle rises and reduced air pressure inside the bottle pushes the paper ball out.
3. None of these.
4. Air pressure drops inside the bottle and the air is pressed inside and the paper ball is pushed out.

Q. The pressure difference beneath and above the wings of aeroplane helps it to fly.

1. True
2. False

Q. When air blows faster, without obstruction, then:

1. air pressure remains the same

2. air pressure decreases
3. air pressure increases
4. air pressure increases by same amount

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 less than that outside

2. Pressure inside the can is more than that outside

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

4. Pressure inside the can is same as that outside

Q. Fill in the blanks.
Air moves from a region of _______ pressure to a region of ________ pressure.

1. low, high
2. high, high
3. low, low
4. high, low

Q.

Identify the odd one among the following with respect to the principle involved.

1. Skating on ice.

2. Formation of water droplets on the surface of a tumbler filled with ice.

3. Fogging of exhaled air in winter morning.

4. Formation of dew.

Q. The low pressure area at the centre of a cyclone is called

(a) spout
(b) typhoon
(c) the eye of the storm
(d) storm surge

Q. Which of the following help in reducing pressure?

1. Broad tyres
2. An arrow's tip
3. Rail sleepers
4. Pointed nail
5. Scissors
6. Flat skies
7. Blunt knife
8. Wide-strap bags

Q. Air moves from a region of higher pressure to a region of lower pressure.

1. False
2. True

Q. Increase in air speed is associated with ______________ .

1. Increase in air pressure
2. Decrease in air temperature
3. Increase in air temperature
4. Decrease in air pressure

Q. High speed winds are accompanied by :

1. Increased pressure
2. Reduced pressure
3. Water vapour
4. Static electricity

Q. The greater the difference in pressure, the faster the air moves.

1. True
2. False

Q.

When does a wind blow ?

1. When there is no change in temperature betwen the regions.

2. When there is a pressure difference between the regions.

3. During earthquake.

4. When there is no pressure difference between the region.

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