Class 9 SST Part 1 Chapter 3 MCQs – Atmosphere & Climate

Class 9 Social Science (SST) Part 1 Chapter 3 MCQs with answers: chapter-wise multiple choice questions on Atmosphere and Climate, NCERT, CBSE 2026-27

Welcome to the Class 9 SST Part 1 Chapter 3 Mock Test on Atmosphere and Climate. This interactive test is designed to help you prepare for your CBSE exams (2026-27) with confidence.

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Question 1

What is the atmosphere?

(a) A layer of water surrounding the Earth.
(b) A blanket of air surrounding the Earth.
(c) The solid crust of the Earth.
(d) The molten core of the Earth.

Question 2

Which two gases are the most abundant in the Earth's atmosphere?

(a) Carbon dioxide and Argon
(b) Oxygen and Carbon dioxide
(c) Nitrogen and Oxygen
(d) Hydrogen and Helium

Question 3

What percentage of the atmosphere is composed of Nitrogen?

(a) 78%
(b) 21%
(c) 0.93%
(d) 0.04%

Question 4

What percentage of the atmosphere is composed of Oxygen?

(a) 78%
(b) 21%
(c) 0.93%
(d) 0.04%

Question 5

Which gas is present in the atmosphere at about 0.04% but plays a crucial role in trapping heat?

(a) Argon
(b) Helium
(c) Carbon dioxide
(d) Neon

Question 6

In which layer of the atmosphere do nearly all weather phenomena occur?

(a) Troposphere
(b) Stratosphere
(c) Mesosphere
(d) Thermosphere

Question 7

What is the average height of the Troposphere?

(a) 50 km
(b) 12 km
(c) 80 km
(d) 700 km

Question 8

Which layer of the atmosphere contains the ozone layer?

(a) Troposphere
(b) Mesosphere
(c) Stratosphere
(d) Exosphere

Question 9

Why do aeroplanes fly in the Stratosphere?

(a) It is free of clouds and weather disturbances.
(b) It has the highest air density.
(c) It is the hottest layer.
(d) It contains the most oxygen.

Question 10

In which layer do most meteorites burn up?

(a) Troposphere
(b) Stratosphere
(c) Thermosphere
(d) Mesosphere

Question 11

Which layer helps in radio transmission by reflecting radio waves?

(a) Mesosphere
(b) Thermosphere
(c) Stratosphere
(d) Exosphere

Question 12

In which layer do the Northern and Southern lights (auroras) occur?

(a) Thermosphere
(b) Mesosphere
(c) Stratosphere
(d) Troposphere

Question 13

Which is the uppermost layer of the atmosphere?

(a) Mesosphere
(b) Thermosphere
(c) Exosphere
(d) Stratosphere

Question 14

What is the transition zone between the Troposphere and Stratosphere called?

(a) Stratopause
(b) Tropopause
(c) Mesopause
(d) Exopause

Question 15

What is the difference between weather and climate?

(a) Weather is day-to-day; climate is long-term average.
(b) Weather is long-term; climate is day-to-day.
(c) Weather is only about rainfall; climate is about temperature.
(d) Weather is global; climate is local.

Question 16

What is insolation?

(a) The heat trapped inside the Earth.
(b) The reflection of sunlight by clouds.
(c) The incoming solar energy intercepted by the Earth.
(d) The radiation emitted by the Earth back into space.

Question 17

Why does temperature decrease from the equator towards the poles?

(a) Because the poles are closer to the Sun.
(b) Because insolation decreases towards the poles.
(c) Because the poles have more vegetation.
(d) Because the equator has less rainfall.

Question 18

What does humidity refer to?

(a) The presence of water vapour in the air.
(b) The weight of the air.
(c) The speed of the wind.
(d) The temperature of the air.

Question 19

What is the process called when water vapour condenses and falls to the Earth?

(a) Evaporation
(b) Condensation
(c) Precipitation
(d) Transpiration

Question 20

Where is atmospheric pressure highest?

(a) At the top of Mount Everest
(b) At sea level
(c) In the stratosphere
(d) At the equator only

Question 21

Which type of weather is associated with high-pressure areas?

(a) Clear and sunny skies
(b) Cloudy and wet weather
(c) Heavy rainfall
(d) Strong storms

Question 22

What is wind?

(a) The movement of water in the ocean.
(b) The rise of hot air.
(c) The sinking of cold air.
(d) The movement of air from high-pressure to low-pressure areas.

Question 23

When does a sea breeze blow?

(a) During the night, from land to sea.
(b) During the day, from sea to land.
(c) During the day, from land to sea.
(d) During the night, from sea to land.

Question 24

When does a land breeze blow?

(a) During the night, from land to sea.
(b) During the day, from sea to land.
(c) During the day, from land to sea.
(d) During the night, from sea to land.

Question 25

Which organization recognizes four main seasons in India?

(a) ISRO
(b) DRDO
(c) IMD
(d) WHO

Question 26

Which season lasts from December to early April in India?

(a) Summer
(b) Winter
(c) Monsoon
(d) Post-monsoon

Question 27

Which season is also known as the pre-monsoon season in India?

(a) Summer
(b) Winter
(c) Monsoon
(d) Autumn

Question 28

Which months generally mark the monsoon season in India?

(a) December to March
(b) March to June
(c) October to December
(d) June to September

Question 29

Which season is known as the retreating monsoon season?

(a) Winter
(b) Summer
(c) Post-monsoon
(d) Spring

Question 30

The word 'monsoon' is derived from which Arabic word?

(a) Mausam
(b) Mausim
(c) Monsoon
(d) Mawsim

Question 31

What is the main cause of the south-west monsoon?

(a) Unequal heating of land and sea
(b) Rotation of the Earth
(c) The Himalayas
(d) Ocean currents

Question 32

Which monsoon brings most of the rainfall to India?

(a) North-east monsoon
(b) Winter monsoon
(c) South-west monsoon
(d) Retreating monsoon

Question 33

Which regions receive rainfall from the north-east monsoon?

(a) Punjab and Haryana
(b) Tamil Nadu and Andhra Pradesh
(c) Rajasthan and Gujarat
(d) Kerala and Karnataka

Question 34

What is the main cause of climate change?

(a) Human activities like burning fossil fuels and deforestation
(b) Natural volcanic eruptions only
(c) Ocean currents only
(d) Changes in the Earth's orbit only

Question 35

What is a 'carbon footprint'?

(a) The footprint left by a carbon molecule.
(b) The amount of oxygen produced by plants.
(c) The total amount of greenhouse gases released by human activities.
(d) The amount of carbon in the soil.

Question 36

What was the main cause of the 2025 Punjab floods mentioned in the chapter?

(a) An earthquake
(b) Heavy monsoon rains and river swelling
(c) A tsunami
(d) A glacial lake outburst

Question 37

Which ancient text contains records of scientific measurements of rainfall?

(a) Kautilya's Arthashastra
(b) The Ramayana
(c) The Mahabharata
(d) The Rigveda

Question 38

What is the objective of the National Monsoon Mission (NMM)?

(a) To stop the monsoon from happening.
(b) To reduce rainfall in India.
(c) To build dams across all rivers.
(d) To enhance monsoon predictions for India.

Question 39

Which layer of the atmosphere is most important for life on Earth?

(a) Exosphere
(b) Thermosphere
(c) Troposphere
(d) Mesosphere

Question 40

What does the ozone layer protect us from?

(a) Ultraviolet radiation
(b) Gamma rays
(c) X-rays
(d) Infrared radiation

Question 41

How does the atmosphere regulate the Earth's temperature?

(a) By blocking all sunlight.
(b) By trapping some of the Sun's energy and preventing it from escaping.
(c) By cooling the Earth completely.
(d) By creating more oxygen.

Question 42

Which component of the atmosphere plays a significant role in cloud formation?

(a) Nitrogen
(b) Oxygen
(c) Argon
(d) Water vapour

Question 43

What holds the atmosphere around the Earth?

(a) The rotation of the Earth
(b) The magnetic field
(c) Gravity
(d) Solar winds

Question 44

The transition zone between the troposphere and the stratosphere is called the:

(a) Stratopause
(b) Tropopause
(c) Mesopause
(d) Exopause

Question 45

In which two layers does temperature decrease with increasing altitude?

(a) Troposphere and Mesosphere
(b) Stratosphere and Thermosphere
(c) Troposphere and Stratosphere
(d) Mesosphere and Exosphere

Question 46

What is the approximate height range of the Thermosphere?

(a) 0 to 12 km
(b) 12 to 50 km
(c) 80 to 700 km
(d) 700 km and above

Question 47

Which human-made factor aggravated the 2025 Punjab floods?

(a) Afforestation
(b) Building dams
(c) Strong embankments
(d) Weak and old river embankments

Question 48

What happens in areas with high temperatures regarding air pressure?

(a) High pressure is created.
(b) Low pressure is created.
(c) No pressure change occurs.
(d) Air stops moving.

Question 49

Which ancient text mentions the date of the onset of the monsoon over central India?

(a) Kalidasa's Meghadutam
(b) The Arthashastra
(c) The Rigveda
(d) The Ramayana

Question 50

The word 'aurora' originates from which language?

(a) Greek
(b) Sanskrit
(c) Latin
(d) Arabic

Test Completed!

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Chapter Summary: Atmosphere and Climate

The atmosphere is a vital blanket of air surrounding the Earth, composed mainly of Nitrogen (78%) and Oxygen (21%), along with trace gases like Carbon Dioxide and Argon. It is structured into five distinct layers—Troposphere, Stratosphere, Mesosphere, Thermosphere, and Exosphere—each with unique characteristics. The Troposphere is where all weather occurs, while the Stratosphere contains the protective Ozone layer.

Weather refers to the day-to-day atmospheric conditions, while climate is the average weather over a long period. India experiences a tropical monsoon climate, heavily influenced by the seasonal reversal of winds. The South-West Monsoon brings the majority of rainfall, while the North-East Monsoon brings rain to the eastern coast. Understanding these patterns is crucial, especially in the context of climate change, which poses significant challenges to agriculture, water resources, and human livelihoods. Mitigation strategies like reducing our carbon footprint are essential for a sustainable future.

Important Topics Covered

Composition and Structure of the Atmosphere
Layers: Troposphere, Stratosphere, Mesosphere, Thermosphere, Exosphere
Weather vs. Climate
Elements of Weather: Temperature, Humidity, Precipitation, Pressure, Wind
Mechanism of the Indian Monsoon (South-West and North-East)
Seasons in India (Winter, Summer, Monsoon, Post-Monsoon)
Climate Change and Carbon Footprint

Why is this Chapter Important?

This chapter is fundamental to understanding the environment we live in. It explains the natural processes that dictate our weather and climate, which directly impact agriculture, water supply, and daily life. By learning about the monsoon mechanism and climate change, students can appreciate the delicate balance of nature and the urgent need for sustainable practices to protect our planet.

Frequently Asked Questions (FAQs)

Q1: What is the composition of the atmosphere?

The atmosphere is composed mainly of Nitrogen (78%) and Oxygen (21%), with small amounts of Argon (0.93%), Carbon Dioxide (0.04%), and trace gases like Helium, Neon, and water vapour.

Q2: What is the difference between weather and climate?

Weather refers to the day-to-day conditions of the atmosphere (hot, cold, rainy), while climate is the average weather condition of a place over a long period (usually 30 years or more).

Q3: What is the mechanism of the Indian monsoon?

It is caused by the unequal heating of land and sea. In summer, the land heats up faster, creating low pressure, which draws in moist winds from the high-pressure Indian Ocean, bringing rain.

Q4: What is a carbon footprint?

A carbon footprint is the total amount of greenhouse gases released into the atmosphere as a result of human activities, such as energy use, transportation, or the production of goods.

Class 9 SST all chapters Chapter 3 Solutions Important Questions

Based on latest NCERT class 9 book.