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Test: Air Around Us - UPSC MCQ


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10 Questions MCQ Test - Test: Air Around Us

Test: Air Around Us for UPSC 2024 is part of UPSC preparation. The Test: Air Around Us questions and answers have been prepared according to the UPSC exam syllabus.The Test: Air Around Us MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Air Around Us below.
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Test: Air Around Us - Question 1
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What is the main role of oxygen in the atmosphere?

Detailed Solution for Test: Air Around Us - Question 1
Oxygen is essential for supporting burning (combustion) and respiration in living organisms. Without oxygen, fires would not burn and animals and plants could not survive. Oxygen is crucial for the processes that keep us and other living things alive. An interesting fact is that oxygen makes up about 21% of the Earth's atmosphere, which is just enough to sustain life.
Test: Air Around Us - Question 2
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Which gas is most abundant in the air we breathe?

Detailed Solution for Test: Air Around Us - Question 2
Nitrogen is the most abundant gas in the air, making up about 78% of the atmosphere. It is a major component of the air we breathe and is important for various biological processes, though it does not support combustion. Nitrogen acts as a buffer to prevent the air from becoming too reactive.
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Test: Air Around Us - Question 3
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How can you demonstrate that air occupies space?

Detailed Solution for Test: Air Around Us - Question 3
Dipping an inverted bottle into water shows that air occupies space. When the bottle is submerged, the air inside the bottle prevents water from entering, creating bubbles as the air escapes. This simple demonstration effectively proves that air takes up space and cannot be seen but occupies volume.
Test: Air Around Us - Question 4
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What does a weather cock indicate?
Detailed Solution for Test: Air Around Us - Question 4
A weather cock (or weathervane) shows the direction in which the wind is blowing. It is a tool used to determine wind direction, which can help in weather forecasting and understanding local weather patterns. Wind direction is crucial for various weather-related applications.
Test: Air Around Us - Question 5
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Why do plants and animals depend on each other for gases in the atmosphere?
Detailed Solution for Test: Air Around Us - Question 5
Plants and animals depend on each other because plants produce oxygen through photosynthesis, which animals need to breathe. Conversely, animals produce carbon dioxide during respiration, which plants need for photosynthesis. This interdependence helps maintain the balance of gases in the atmosphere essential for life.
Test: Air Around Us - Question 6
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What happens to the air in a sealed container when heated?
Detailed Solution for Test: Air Around Us - Question 6
When air in a sealed container is heated, it expands and exerts more pressure. This is because heating causes the air molecules to move faster and spread out, increasing the volume and pressure within the container. This principle is used in various applications, including hot air balloons and pressure cookers.
Test: Air Around Us - Question 7
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Which gas in the air is used by plants for photosynthesis?
Detailed Solution for Test: Air Around Us - Question 7
Plants use carbon dioxide for photosynthesis, a process in which they convert carbon dioxide and sunlight into glucose and oxygen. This process is essential for plant growth and also helps maintain the balance of carbon dioxide and oxygen in the atmosphere.
Test: Air Around Us - Question 8
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How does dust affect the air quality?
Detailed Solution for Test: Air Around Us - Question 8
Dust can negatively affect air quality by making the air harmful to breathe, especially for people with respiratory conditions. Dust particles can cause irritation and lead to health problems when inhaled. High levels of dust can also reduce visibility and contribute to air pollution.
Test: Air Around Us - Question 9
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What is the primary function of the atmosphere surrounding the Earth?
Detailed Solution for Test: Air Around Us - Question 9
The primary function of the Earth's atmosphere is to block harmful radiation from the sun, protecting living organisms from ultraviolet (UV) rays. It also helps in regulating temperature and supporting life by providing essential gases like oxygen. The atmosphere plays a critical role in maintaining the Earth's climate and weather systems.
Test: Air Around Us - Question 10
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Which gas in the air is a major contributor to the greenhouse effect?
Detailed Solution for Test: Air Around Us - Question 10
Carbon dioxide is a major contributor to the greenhouse effect. It traps heat in the Earth's atmosphere, leading to global warming. Carbon dioxide levels have increased due to human activities such as burning fossil fuels and deforestation, impacting the climate and environment.
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