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Important Questions: Air - UPSC MCQ


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15 Questions MCQ Test Geography for UPSC CSE - Important Questions: Air

Important Questions: Air for UPSC 2025 is part of Geography for UPSC CSE preparation. The Important Questions: Air questions and answers have been prepared according to the UPSC exam syllabus.The Important Questions: Air MCQs are made for UPSC 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions: Air below.
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Important Questions: Air - Question 1

What is released in the air from the burning of fuels?

Detailed Solution for Important Questions: Air - Question 1

Hydrocarbon fuels like methane (CH4) burn in the presence of oxygen to produce carbon dioxide and water. This process of combustion releases energy. 

Important Questions: Air - Question 2

How does the air around us help to keep the Earth at a comfortable temperature?

Detailed Solution for Important Questions: Air - Question 2

The air around us acts like a cozy blanket, protecting us from the strong rays of the sun. Without this protective layer, we would either feel too hot during the day or too cold at night. This blanket of air helps to keep the Earth at just the right temperature for us to live comfortably.

Important Questions: Air - Question 3

The most plentiful gas in the air is _____.

Detailed Solution for Important Questions: Air - Question 3

Nitrogen is the most plentiful gas in the air. When we inhale, we take some amount of nitrogen into our lungs and exhale it. Plants cannot take nitrogen directly from the air. Bacteria in the soil help plants use nitrogen.

Important Questions: Air - Question 4

What do we call the movement of air from high pressure areas to low pressure areas?

Detailed Solution for Important Questions: Air - Question 4

Wind is the movement of air from high pressure areas to low pressure areas. You can feel wind blowing gently on a calm day or strongly during a storm. Wind helps in spreading seeds, carrying pollen, and even powering wind turbines to create electricity.

Important Questions: Air - Question 5

The standard unit of measuring temperature is degree _____.

Detailed Solution for Important Questions: Air - Question 5

Celsius is the standard unit we use to measure how hot or cold something is. Water freezes at 0 degrees Celsius and boils at 100 degrees Celsius. 

Important Questions: Air - Question 6

State whether the following statement is True or False

Temperature decreases from the equator towards the poles.

Detailed Solution for Important Questions: Air - Question 6
  • True! The temperature decreases as we move from the equator towards the poles. This happens because the amount of solar energy, called insolation, decreases from the equator towards the poles.
  • That's why places near the poles are colder compared to places near the equator where it's warmer.
Important Questions: Air - Question 7

The water vapor in the air is known as _______.

Detailed Solution for Important Questions: Air - Question 7

The water vapor in the air is called humidity. This is how we describe how much water is in the air around us.

Important Questions: Air - Question 8
What upsets the balance of oxygen and carbon dioxide in the atmosphere?
Detailed Solution for Important Questions: Air - Question 8
The balance of oxygen and carbon dioxide is upset by cutting trees and burning fossil fuels, which increase the amount of carbon dioxide in the atmosphere, affecting climate and weather patterns.
Important Questions: Air - Question 9
In which layer do meteorites burn up upon entering the Earth's atmosphere?
Detailed Solution for Important Questions: Air - Question 9
- Meteorites enter the Earth's atmosphere at high speeds, typically between 11 to 72 kilometers per second.
- As they descend, they encounter air resistance, which generates intense heat.
- This heating causes the meteorites to vaporize and burn up, primarily occurring in the mesosphere.
- The mesosphere extends from about 50 km to 85 km above the Earth's surface, making it the ideal layer for this phenomenon.
- Hence, meteorites do not reach the surface and disintegrate in this layer.
Important Questions: Air - Question 10
What type of gases are found in the exosphere?
Detailed Solution for Important Questions: Air - Question 10
The exosphere contains very thin air and is composed of light gases like helium and hydrogen that can escape into space.
Important Questions: Air - Question 11

What is the primary factor that influences the distribution of temperature on Earth?

Detailed Solution for Important Questions: Air - Question 11

The primary factor that influences the distribution of temperature on Earth is insolationInsolation refers to the amount of solar energy received by the Earth's surface. It varies based on factors such as latitude, time of year, and the angle of the sun's rays. This variation in solar energy affects the temperature patterns across different regions.

Important Questions: Air - Question 12
What instrument is used to measure atmospheric pressure?
Detailed Solution for Important Questions: Air - Question 12
A barometer is used to measure atmospheric pressure. It helps in understanding weather patterns, as pressure differences drive wind and weather systems.
Important Questions: Air - Question 13
What is the effect of cutting trees on hillsides in terms of rainfall?
Detailed Solution for Important Questions: Air - Question 13
Cutting trees on hillsides can lead to rainwater flowing down bare mountains, causing flooding in low-lying areas. Trees help in preserving water and preventing floods.
Important Questions: Air - Question 14

Why do astronauts wear special protective space suits?

Detailed Solution for Important Questions: Air - Question 14

Astronauts wear special protective space suits because the lack of air pressure in space means there is no external force to counteract the pressure exerted by their bodies. Without these suits, the internal pressure would cause their blood vessels to burst, leading to severe injury or death. The suits also provide protection against extreme temperatures, micrometeoroids, and offer a supply of oxygen for breathing.

Important Questions: Air - Question 15
Carbon dioxide released into the atmosphere creates a ______________.
Detailed Solution for Important Questions: Air - Question 15
Carbon dioxide is a significant greenhouse gas that traps heat in the Earth's atmosphere. This trapping of heat is known as the greenhouse effect. The primary greenhouse gases include water vapor, carbon dioxide, methane, nitrous oxide, and ozone. These gases absorb and emit radiant energy, which increases the temperature of the Earth's surface and atmosphere, contributing to global warming and climate change.
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