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29 questions · timed · auto-graded

Question 11 Mark
What is known as ozone layer ?
Answer
Stratosphere contains sufficient amount of ozone which absorbs the extremely hot ultra-violet rays of the sun. It is known as ozone layer.
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Question 21 Mark
In which layer of atmosphere do all weather conditions occur?
Answer
Troposphere is the layer where all weather conditions occur in different forms.
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Question 31 Mark
Mention the chief characteristics of stratosphere.
Answer
There is total absence of water vapour in this layer. It extends upto a height of 50 km. The temperature remains constant up to – 55°C.
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Question 41 Mark
What is known as troposphere?
Answer
Troposphere is the lowest and densest layer of atmosphere touching the land surface. It extends from 8km to 18 km. in height
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Question 51 Mark
State the gaseous composition of the atmosphere.
Answer
The atmosphere consists of 78% Nitrogen 21% oxygen and 1% other gases.
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Question 61 Mark
What is called weather?
Answer
Weather is the physical condition or state of the atmosphere (temperature, pressure, state of the sky, etc.) at a given locality or an area.
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Question 71 Mark
Name two chief characteristics of atmosphere.
Answer
Atmosphere protects the earth from harmful ultra-violet and infra-red rays of the sun.
It controls the hydrological cycle and provides life-giving gases.
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Question 81 Mark
Name important Greenhouse gases.
Answer
The main Greenhouse gases are CFCs (Chlorofluorocarbons) and nitrogen oxides which are emitted by fertilizers industries and transport engines along with carbon dioxide and methane.
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Question 91 Mark
What is known as Global Warming?
Answer
Global Warming is the increase in temperature of earth due to enhanced concentration of Greenhouse gases (CFCs) in the atmosphere.
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Question 101 Mark
What is known as atmosphere?
Answer
The blanket of air upto 1500 km surrounding the earth is known as atmosphere.
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Question 111 Mark
Atmosphere is the most dynamic element in Environment’. Discuss.
Answer
Atmosphere keeps on changing day and night. So the weather changes day-to-day. Great contrasts are found in day and night temperatures. Clouds change wind velocity.
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Question 121 Mark
The exosphere allows the gas molecules to easily escape into space.
Answer
The exosphere allows the gas molecules to easily escape into space due to lack of gravity.
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Question 131 Mark
The ionosphere (thermosphere) is suited to long distance communication.
Answer
The ionosphere is suited to long-distance communication because radio waves used for this purpose are reflected back to the earth by the electrically charged gas molecules in it.
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Question 141 Mark
The stratosphere is crucial to life on Earth.
Answer
The stratosphere is crucial to life on the earth because the ozone layer present in it absorbs the harmful ultraviolet radiation of the sun.
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Question 151 Mark
Solid particles play an important role in the atmosphere.
Answer
The solid particles play an important role in the atmosphere because they act as nuclei for the condensation of water vapour around them.
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Question 161 Mark
The amount of water vapour in the atmosphere varies from place to place.
Answer
The amount of water vapour in the atmosphere varies from place to place due to difference in temperature
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Question 171 Mark
The Earth does not experience extremes of temperature as in other planets.
Answer
The earth does not experience extremes of temperature as on other planets due to the presence of the atmosphere.
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Question 201 Mark
Mesosphere 
Answer
The layer of the atmosphere which extends to a height of 80 km above the stratosphere is called Mesosphere.
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Question 211 Mark
CFC’s 
Answer
These are chloro-fluoro carbons and are used as propellants in aerosol cans, refrigerants in refrigerators, air conditioning and as solvent cleaners in the microelectronic industry.
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Question 241 Mark
Greenhouse effect
Answer
The warming up of the atmosphere due to trapping of the solar radiation reflected by the earth by gases like carbon dioxide is called Greenhouse effect.
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Question 271 Mark
Ozone hole
Answer
The large depletion of ozone layer in certain parts of the atmosphere is called Ozone hole.
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Question 281 Mark
‘The atmosphere acts as a blanket or a glasshouse’. Discuss.
Answer
Atmosphere acts like a blanket keeping the earth warm. It absorbs incoming solar radiation and does not allow radiation to escape. So equable temperatures are found.
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Question 291 Mark
How does atmosphere govern life on earth?
Answer
Stratosphere absorbs the harmful ultra-violet rays of the sun and the troposphere regulates all weather conditions e.g. ideal temperature, rainfall and their impact on human life.
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[1 Mark Question Answer] - Geography STD 9 Questions - Vidyadip