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18 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
How is the early or late drying up of clothes related to humidity?
Answer
As the moisture-holding capacity is found to be high in low humidity air, it leads to early drying up of clothes. As the moisture-holding capacity is found to be low in high humidity air, it leads to late drying up of clothes.
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Question 21 Mark
Is there any relationship between formation of fungus and humidity?
Answer
There is a direct relationship between formation of fungus and humidity. Humidity supports the growth of fungus.
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Question 31 Mark
Observe how humidity affects the food materials at our home and write about the same.
Answer
Due to humidity, fungus flourish on food materials at our home and it gets spoiled.
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Question 41 Mark
How does the humidity affect the human body?
Answer
The rate of respiration and sweating increases due to humidity.
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Question 61 Mark
Which type of charge is found on the land below the cumulonimbus clouds?
Answer
Positive charge is found on the land below the cumulonimbus clouds.
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Question 71 Mark
Which type of charge is found at the low end of the cumulonimbus clouds?
Answer
Negative charge is found at the low end of the cumulonimbus clouds.
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Question 81 Mark
Which type of charge is found at the upper end of the cumulonimbus clouds?
Answer
Positive charge is found at the upper end of the cumulonimbus clouds.
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Question 91 Mark
Around what does the condensation of the water vapour in the air occur?
Answer
The condensation of the water vapour in the air occurs around the minute particles of dust or salt in the air.
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Question 121 Mark
What is a cloud? Write its types.
Answer
A. Meaning:
A visible mass of fine particles of ice and water accumulated around the dust particles in the air at high altitude is called a cloud.

B. Types:
The following are the types of clouds:

  1. High clouds: Clouds at an altitude of 7000 m to 14000 m are considered as high clouds. Cirrus, Cirro-Stratus and CirroCumulus are high clouds.
  2. Medium clouds: Clouds at an altitude of 2000 m to 7000 m are considered as medium clouds. Alto-Stratus and Alto Cumulus are medium clouds.
  3. Low clouds: Clouds at an altitude of less than 2000m are considered as low clouds. Strato-Cumulus, Stratus, Nimbostratus, Cumulus and Cumulonimbus are low clouds
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Question 131 Mark
What are the prerequisites for condensation?
Answer
High relative humidity and dew point temperature of the air are the j prerequisites for condensation.
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Question 141 Mark
How is humidity measured?
Answer

1. The amount of water vapour in 1 cu.m, of air is called the absolute humidity.
2. Absolute humidity is measured with the help the following formula:
Absolute humidity
$=\frac{\text { Mass of water vapour }}{\text { Volume of air }}$
3. The amount of water vapour present in air expressed as a percentage of the amount needed for saturation at the same temperature is called relative humidity.
4. Relative humidity is measured with the help of the following formula: Relative humidity (%)
Image
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Question 151 Mark
Why is the air in a region dry?
Answer
Due to the low amount of the moisture in the air, the air in a region is I dry.
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Question 161 Mark
What is meant by the saturation of the air?
Answer
The condition of air at a certain temperature, in which the moisture-holding capacity of air becomes equal to the I proportion of moisture present in it, is called saturation of the air.
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Question 171 Mark
What is meant by the moisture-holding capacity of air?
Answer
The capacity of air to hold moisture at a given temperature, is called the moisture-holding capacity of air.
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Question 181 Mark
What is evaporation?
Answer
The process of converting water into steam or water vapour is called evaporation.
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