Winds Storms and Cyclones Test

Result

Winds Storms and Cyclones Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

When a balloon is filled with air, which of the following holds true?

A
air pressure inside the balloon increases

B
air pressure inside the balloon decreases

C
air pressure inside the balloon remains the same

D
insufficient information

Solution

When a balloon is filled with air, air presses against the walls of the balloon giving it its shape. When a balloon is filled with air, air pressure inside the balloon increases.
Question 2
1 / -0

Paheli's father gifted her a polka dot balloon one summer day. Her mother turns the air conditioning on. What would Paheli observe with the balloon after an hour inside the cold room?

A
The dots will move closer together

B
The dots will move farther apart

C
The dots remain at the same distance as they were before

D
They may or may not move

Solution

Hot air expands and cold air contracts. As the air inside the balloon slowly cools it will contract and the balloon dots will move closer together.
Question 3
1 / -0

In the experiment to demonstrate that air exerts pressure, when ice cold water is poured over a sealed tin can containing hot air, the can collapses. Pick the correct explanation for the experiment.

A
The can collapses because the pressure inside the can falls below the pressure outside the can

B
The can collapses because the pressure outside the can falls below the pressure inside the can

C
The air pressure inside the can is same as the pressure outside the can

D
Insufficient information

Solution

When cold air is poured on the can, some steam in the can condenses into water, reducing the amount of air inside. The pressure of the air inside the can decrease than the pressure exerted by the air from outside the can. As a result, they can get compressed.
Question 4
1 / -0

A magician fills up one third of a glass with water. He places a card over the mouth of the glass and inverts it. Why doesn't the water fall?

A
The air pressure outside the glass keeps the cardboard in place

B
The weight of the the water is balanced by the weight of the cardboard

C
It is magic

D
The air pressure inside the glass is higher

Solution

The air outside exerts an upward pressure on the index card. This air pressure is more than the weight of the water in the glass.
Question 5
1 / -0

Boiling tubes with balloons tied to their necks are placed in different beakers containing liquids at different temperatures as shown. Which of the following represent the correct order of the temperature of the liquids?

A
$$A>B>C$$

B
$$B>A>C$$

C
$$C>A>B$$

D
$$A>C>B$$

Solution

We know hot air expands and cold air contracts. As the balloon in the beaker, $$B$$ seems to be inflated, it should be hotter compared to the rest of the beakers. In the beaker, $$C$$ the balloon seems deflated, which means air has contracted so it should have the least temperature.
Question 6
1 / -0

Which balloon has higher air pressure inside?

A
Deflated balloon

B
Inflated balloon

C
Both have same air pressure

D
Both have no air pressure

Solution

Air exerts pressure. When a balloon is inflated its surface feels tighter due to the air pressure on the walls. The balloon gets its shape from the air pressure inside. Hence, the inflated balloon will have greater air pressure.
Question 7
1 / -0

Boiling tubes with a balloons tied to their necks are immersed in three different liquid samples as shown in the image. Which sample contains hot water?

A
A

B
B

C
C

D
Cannot be determined

Solution

In beaker B the balloon is slightly more inflated. This means the air inside the boiling tube has expanded more in comparison to the rest of the tubes. As we know air expands on heating we can say water in beaker B is hotter.
Question 8
1 / -0

Consider the following statements.
A. Air has the capacity to do work.
B. Air exerts pressure

A
Both A and B are correct

B
A is correct and B is incorrect

C
A is incorrect and B is correct

D
Both A and B are incorrect

Solution

Work is given by
$$Work=Force\times Displacement$$
We know that air exerts pressure and hence force.
As air can exert force and can displace and distort objects, we can say it has the capacity to do work.
Question 9
1 / -0

Which of the following is not true for hot air in comparison to colder air?

A
Hot air is lighter than cold air

B
Hot air rises up

C
Hot air expands

D
None of the above

Solution

Air expands on heating. As hot air expands, its density decreases and it becomes lighter and rises up in atmosphere.
Question 10
1 / -0

What can you say about the density of air inside a hot air balloon?

A
Density of air inside a hot air balloon is more than the density of air outside it

B
Density of air inside a hot air balloon is less than the density of air outside it

C
Density of air inside a hot air balloon is the same as the density of air outside it

D
Either A or B

Solution

Hot air inside baloon is lighter than colder air outside. The reason for this is when air gets heated up it expands and becomes less dense than the air surrounding it ,also the distance between the molecules increases. So hot air occupies more volume and density decreases because less mass is present in same volume.