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3. Humidity and Clouds question answer Geography class 8

Class 8 Humidity and Clouds question answers geography

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Q 1. Match the column and complete the chain:


{ for complete table rotate your mobile}

A

B (Ans)

C (Ans)

(A) Cirrus

(ii) higher altitude

(d) snow flake clouds

(B) Cumulonimbus

(i) Vertical extent in the sky

(a) Roaring clouds

(C)Nimbostratus

(iv) Low altitude

(c)continuous rainfall

(D) Alto-cumulus

(iii) Medium altitude

b) Floating clouds

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Q 2. Choose the correct word from the brackets and complete the sentence:

(Cumulonimbus, Relative humidity, Absolute humidity, Condensation, Vapour-holding capacity)


1) The ———— of air is dependent on the temperature of air.

 

Ans:  The Vapour-holding capacity of air is dependent on the temperature of air.

 

2)The amount of vapour in 1 cu.m. of air shows the —————-.

Ans: The amount of vapour in 1 cu.m. of air shows the Absolute humidity.


3)As ——————– is less in desert areas, the air is dry there.

 Ans: As Relative humidity is less in desert areas, the air is dry there.

 

4) —————–type of clouds are indicators of storm.

Ans: Cumulonimbus type of clouds are indicators of storm.

 

5)In a free environment, the ————— of the vapour present in the atmosphere takes place around dust particles.

Ans: In a free environment, the Condensation of the vapour present in the atmosphere takes place around dust particles.

 

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Q 3. Differentiate between:

 

Difference between humidity and clouds

(a) Humidity and clouds

Ans:

 

Humidity

clouds

1.The proportion of water vapour in the air is called its humidity.

1.A mass of fine particles of ice and water accumulated around the dust particles in the air at high altitude is called a cloud.

2.absolute humidity and relative humidity are two types of the humidity.

2.High cloud, Medium cloud, and Low cloud are three types of the Clouds.

3.It is Invisible

3. It is visible.



Difference between humidity and absolute humidiy

(b) Relative humidity and Absolute humidity

Ans:

 

Relative humidity

Absolute humidity

1. It is the ratio between the maximum capacity of the air to hold the moisture at the given temperature and the amount of water vapour actually present in the air.

1. The amount of water vapour in 1 cu.m. of air is the absolute humidity of the air.

2. It is expressed in percentage.

2.It is expressed in grams of water vapour per cubic metre of air (gm/m3 )

3. Relative humidity is more near coastal areas while it is less in desert areas.

3. Absolute humidity is higher in the equatorial areas while it reduces as we move towards the poles.

4. The amount of water vapour changes according to difference in temperature. Similarly, relative humidity also changes

4. The distribution of land and water on earth and the seasons also affect absolute humidity



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Difference between cumulus clouds and cumulonimbus clouds

(c) Cumulus clouds and cumulonimbus clouds

Ans:

 

Cumulus clouds

cumulonimbus clouds

1. The vertical flow of the air adds to the formation of cumulus clouds.

1.the vertical expanse of cumulus clouds increase so much that they turn into cumulonimbus clouds.

2. These are huge and dome-shaped.

2. These look like huge mountains.

3. These clouds are grey in colour.

3. These clouds are dense and dark in colour.

4. Cumulus clouds are an indicator of pleasant weather.

4. cumulonimbus clouds are indicators of thunderstorm.

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Q 4. Answer the following questions:

 

(a) Why is the air in a region dry?

Ans:

1)The dryness of the air in a region depends on the proportion of water vapour in the air, i.e. humidity.

2)In dry air there is no water vapour present in the air. When the humidity in the air is 0gm/cu.m., the air is said to be dry.

3)In cold regions, the air is cooler. Hence the vapour holding capacity is also less.

Therefore, in some regions, especially , at high altitudes the air is dry.

 

(b) How is humidity measured?

Ans:

The humidity of the air is measured in grams per cubic meter (gm/m3)

 

(c) What are the prerequisites for condensation?

Ans:

1)The process of changing of water vapour in the air into water is called condensation or densification.

2)If the temperature of the air reduces, its vapour holding capacity also reduces.

3)When relative humidity of the air becomes 100%, vapour starts condensing.

The temperature of the air should be at dewpoint. .

 

(d) What is a cloud? Write its types.

Ans:

                    A mass of fine particles of ice and water accumulated around the dust particles in the air at high altitude is called a cloud.

1)There are three main types of the clouds are as follows:High cloudes: these clouds are mainly made up of ice particles. They can be classified into cirrus clouds, cirrocumulus clouds and cirrostratus clouds.

2)Medium clouds: These cloud include alto-cumulus clouds and alto-stractus cloud.

3)Low clouds: These consist of five types of clouds. Strato-cumulus, stratus, Nimbo-stratus, Cumulus clouds and Cumulonimbus cloud.

 

(e) Which type of clouds give rain?

Ans:

1)Nimbo-stratus clouds has thick layers. They are grey- -ash in colour and cause continuous rainfall and even snowfall.

2)Cumulonimbus clouds are bring rain with storm and may sometime bring hailstones. But such a type of rain does not last long.



(f) On what does the percentage of relative humidity depend?

Ans:

1)Relative humidity is the ratio between the maximum capacity of the air to hold the moisture at the given temperature and the amount of water vapour actually present in the air. It is express in percentage.

2)The amount of water vapour changes according to difference in temperature. Similarly, relative humidity also changes.

3)The percentage of relative humidity is depends on the absolute humidity and vapour-holding capacity of the air at a given temperature.

 


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Q 5. Give geographical reasons:

 

(a) Clouds float in the sky.

Ans:

1)A mass of fine particles of ice and water accumulated around the dust particles in the air at high altitude is called a cloud.

2)Condensed water or snow particles in the clouds are very fine and almost weightless

Therefore, clouds float in the sky.

 

 (b) The proportion of relative humidity changes according to altitude.

Ans:

1)Relative humidity is the ratio between the maximum capacity of the air to hold the moisture at the given temperature and the amount of water vapour actually present in the air.

2)The amount of water vapour changes according to difference in temperature. Similarly, relative humidity also changes.

3)As one goes at higher altitude, the temperature also reduces which means that the vapour holding capacity also reduces. This means that the relative humidity is more as the temperature is less.

4)At lesser altitude, the temperature is more so the relative humidity is less as the vapour holding capacity is more.

Thus, the proportion of relative humidity changes according to altitude.

 


(c) Air becomes saturated.

Ans:

1)The moisture-holding capacity of the air depends on its temperature. Higher the temperature, higher is the holding capacity. Lower the temperature, lower is the moisture holding capacity of air.

2)But sometimes at certain temperature, the moisture holding capacity of air becomes equal to the proportion of moisture present in it.

3)At this state no more moisture can be absorbed by the air.

This cause air become saturated.

 


(d) Cumulus clouds change into cumulonimbus clouds.

Ans:

1)The vertical flow of the air adds to the formation of cumulus clouds.These are huge and dome-shaped.

2)The vertical expanse of cumulus clouds increase so much that they turn into cumulonimbus clouds.These look like huge mountains.

Thus, cumulus clouds change into cumulonimbus clouds.

 

Q 6. Solve the following:


(a) When the temperature of the air is 30° C, its vapour-holding capacity is 30.37 gms/cu.m. If absolute humidity is 18 gms / cu.m. then what would be the relative humidity?

Ans:

Given:-

Vapour holding capacity = 30.37gms/cu.m.

Temperature of the air= 30° C

Absolute humidity = 18gms/cu.m.

Relative humidity = ?

Relative humidity (R.H.) (%)

= Absolute humidity / Vapour holding capacity ×100

= 18/30.37 *100

= 59.27 %

Therefore when the temperature of the air is 30° C, the Relative humidity (R.H.) would be 59.27 %

 

(b) What would be the absolute humidity of air if 1 cu.m. air contains 4.08 gms of vapour at 0°C temperature? .

Ans:

Temperature of the air = 0°C

Vapour holding capacity at 1 cu.m. = 4.08 gms

Absolute humidity= ?

Now, the amount of water vapour in 1 cu.m. of air is the absolute humidity of the air.

Therefore, The absolute humidity of the air is 4.08 gms/cu.m.

 



 Q 7. Collect the weather related information from newspapers for the month of July. Relate the difference in the maximum and minimum temperatures with humidity.

Ans: ……………….

 

Activity:

 

Make a table showing the types of clouds. Use various photographs.

Ans:


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