Questions · Page 2 of 2

Question(1 Marks)

Question 511 Mark
What is the significance of greenhouse gas?
Answer
Without the greenhouse gas the earth would have been too cold to line in.
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Question 531 Mark
Define dew point?
Answer
: The temperature at which the air becomes fully saturated is known as dew point.
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Question 551 Mark
Define Mesosphere.
Answer
This is the third layer of the atmosphere. It lies above the stratosphere. It extends up to the height of 80km. Meteorites burn in this layer on entering from the space.
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Question 561 Mark
Why is there no air pressure on the moon?
Answer
There is no air on the moon and therefore no air pressure.
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Question 581 Mark
What is global warming?
Answer
When the level of carbon dioxide increases in the atmosphere due to factory smoke or car fumes, the heat retained increases the temperature of the earth. This is called global warming.
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Question 591 Mark
What are different forms of precipitations?
Answer
Different forms of precipitations are: dew, rainfall, hail, snowfall, fog, sleet.
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Question 601 Mark
What is the freezing and boiling point of water in celsius?
Answer
What is the freezing and boiling point of water in celsius?
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Question 621 Mark
What is the significance of ozone in the atmosphere?
Answer
One important feature of stratosphere is that it contains a layer of ozone gas it protects us from the harmful effect of the sun rays.
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Question 631 Mark
Why do we feel uncomfortable on a humid day?
Answer
It is because sweat from our body does not evaporate easily.
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Question 641 Mark
How does carbon dioxide create a greenhouse effect on earth?
Answer
Carbon dioxide released in the atmosphere create a green house effect by trapping the jeart radiated from the earth.
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Question 651 Mark
Which layer is free from water vapour and dust particle?
Answer
The stratosphere is free from water vapour and dust particle.
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Question 671 Mark
In which layers of the earth's atmosphere does the temperature rises very rapidly with increasing height?
Answer
In thermosphere temperature rises very rapidly with increasing height.
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Question(1 Marks) - Page 2 - Social Studies STD 7 Questions - Vidyadip