Gaseous Pressure

Q.

When you press a rubber sucker on a smooth surface it sticks to the surface .Explain why this happens

Q.

What is a rubber sucker ? How does it work ? State any one use of a rubber sucker.

Q.

What is a rubber sucker? How does it work?

Q.

An inflated balloon is placed in a a jar, which is connected to an evacuating pump. What happens if the air inside the jar is pumped out? Explain.

Q. Why don't we feel atmospheric pressure as such?

1. It acts only on the atmosphere and not on us.
2. It is smaller in magnitude.
3. Our internal body pressure is equal to atmospheric pressure.
4. It does not act at the sea level.

Q. On heating water, bubbles being formed at the bottomof the vessel detach and rise. Take the bubbles to bespheres of radius R and making a circular contact ofradius r with the bottom of the vessel. If r << R and thesurface tension of water is T, the value of r just beforebubbles detach is (density of water is (pR22, pog6TR23T

Q. What happens when we blow up the balloon by mouth?

1. The atmosphere exert inward pressure on the balloon.
2. The air inside the balloon exert outward pressure on the balloon.
3. The atmosphere exert outward pressure on the balloon.
4. The air inside the balloon exert inward pressure on the balloon.

Q.

If an inflated balloon is punctured, air escapes from the balloon. What inference can we deduce from this?

1. The air inside it was hot.

2. None of these.

3. The air inside the balloon was exerting pressure in all directions.

4. Of acceleration due to gravity.

Q.

Why two holes are made in an oil can to pour out oil from it?

Q. Statement 1: Evaporation is a bulk phenomenon which can take place at all temperatures.​

Statement 2: Boiling is a surface phenomenon which takes place at a fixed temperature for a specific liquid.​

1. Both statements are correct.​
2. Statement 1 is incorrect, Statement 2 is correct.​
3. Statement 1 is correct, Statement 2 is incorrect.​
4. Both statements are incorrect.​

Q.

If an inflated balloon is punctured, air escapes from the balloon. What inference can we deduce from this?

1. Pressure in balloon is greater than atmospheric pressure.

2. The molecules of air inside the balloon are stationary.

3. Air inside the balloon is hot.

4. Air inside the balloon is cold.

Q.

By drawing a neat diagram explain the construction and working of an air pump.

Q.

Will you be able to drink water in space using a straw?

Why or why not?

Q.

What is a rubber sucker ? How does it work ? State any one use of a rubber sucker.

Q.

In high-pressure air, the molecules are _______ than in low-pressure air.

1. at rest

2. low temperature

3. far away

4. closer together

Q.

Describe an experiment to show that liquid pressure depends on the density of the liquid.

Q.

A balloon inflates when the air is pumped into it. Which one of the following is the correct conclusion that can be derived out of this?

1. Gases exert pressure

2. Gases don't exert pressure

3. Gases can change their volume

4. None of these

Q. If an inflated balloon is punctured, air escapes from the balloon. What inference can we deduce from this?

1. Air inside the balloon is cold.
2. Pressure in balloon is greater than atmospheric pressure.
3. The molecules of air inside the balloon are stationary.
4. Air inside the balloon is hot.

Q.

While inflating a balloon, the entire air that was blown into the balloon escapes from when its mouth is left open. This is because:

1. Of acceleration due to gravity.

2. The air inside the balloon was exerting pressure in all directions.

3. The air inside it was hot.

4. None of these.

Q.

Will you be able to drink water in space using a straw? Why/why not?

Q. Pressure exerted by atmosphere is known as ____

1. magnetic force
2. atmospheric force
3. liquid pressure
4. atmospheric pressure

Q. When a helium balloon rises too high then _______.

1. it shrinks
2. it bursts
3. its size remains same
4. its size keeps on varying

Q.

While inflating a balloon, the entire air that was blown into the balloon escapes from it when its mouth is left open. This is because:

1. The air inside the balloon was exerting pressure in all directions.

2. Of acceleration due to gravity.

3. The air inside it was hot.

4. None of these.

Q.

If an inflated balloon is punctured, air escapes from the balloon. What inference can we deduce from this?

1. Air inside the balloon is cold.

2. The molecules of air inside the balloon are stationary.

3. Air inside the balloon is hot.

4. Pressure in balloon is greater than atmospheric pressure.

Q. A balloon inflates when the air is pumped into it. Which of the following is the correct conclusion?

1. Gases exert pressure.
2. Gases don't exert pressure.
3. Gases are heavier than solids.
4. Gases do not occupy any volume.

Q.

A balloon inflates when air is pumped into it. Which of the following conclusions can be derived from this?

1. Gases exert pressure.

2. Gases don't exert pressure.

3. Gases don't have any mass.

4. Gases are heavier than solids.

Q.

why does our body not feel the enormous atmospheric pressure?

Q. Explain reasons for the following :

(a) A helium balloon bursts when it rises to high altitudes? [2 marks]

(b) We feel nauseated when we go deep underwater? [2 marks]

Q. What happens when we blow up the balloon by mouth?

1. The air inside the balloon exert inward pressure on the balloon.
2. The atmosphere exert outward pressure on the balloon.
3. The atmosphere exert inward pressure on the balloon.
4. The air inside the balloon exert outward pressure on the balloon.

Q.

If an inflated balloon is punctured, air escapes from the balloon. What inference can we deduce from this?

1. Of acceleration due to gravity.

2. The air inside the balloon was exerting pressure in all directions.

3. The air inside it was hot.

4. None of these.