CBSE Class 11 Geography Chapter 7: Natural Hazards and Disasters NCERT Solutions

Reviewed by · Updated on

NCERT Solutions PDF Class 11 PDF

This chapter provides essential NCERT Solutions for Class 11 Geography, focusing on Chapter 7: Natural Hazards and Disasters. It delves into various natural phenomena that pose risks to human life and property, including frequent floods in states like Assam and West Bengal, landslides in Uttarakhand's Pithoragarh district, and the unique winter floods affecting Tamil Nadu. The solutions also explain the formation of cyclones, the reasons behind frequent earthquakes in the seismically active Himalayan and North-Eastern regions of India due to plate tectonics, and the differences in flood patterns between Eastern and Western India. These solutions are designed to help students grasp the causes, characteristics, and geographical distribution of natural hazards and disasters, aiding in their exam preparation and understanding of environmental risks.

Home

Quick info

BoardCBSE
ClassClass 11
SubjectGeography
Session2026
LanguageEnglish
TypeNCERT Solutions
Chapter7. Natural Hazards and Disasters

Chapter summary

Chapter 7 of the Class 11 Geography syllabus focuses on Natural Hazards and Disasters. The NCERT Solutions cover key concepts such as the conditions that turn a hazard into a disaster, the geographical factors contributing to frequent floods in specific Indian states like Assam and West Bengal, and the occurrence of landslides in regions like Uttarakhand. It also explains the formation of cyclones, the seismic activity in the Himalayas and North-East India due to plate tectonics, and the distinct flood patterns in Eastern versus Western India. These solutions provide clear explanations for understanding these natural events.

Learning outcomes

  • Identify states prone to frequent floods in India.
  • Locate specific disaster-prone areas like Malpa in Uttarakhand.
  • Differentiate between hazards and disasters.
  • Explain the causes of earthquakes in the Himalayan region.
  • Understand the basic requirements for cyclone formation.
  • Distinguish between flood types in Eastern and Western India.

Topics covered

Paper topics

  • Natural Hazards
  • Natural Disasters
  • Floods in India
  • Landslides
  • Cyclones
  • Earthquakes
  • Plate Tectonics
  • Himalayan Seismicity
  • North-Eastern Region Seismicity
  • River Islands
  • Atmospheric Hazards
  • Regional Disaster Patterns

Important topics

  • Distinction between Hazard and Disaster
  • Causes of Earthquakes in the Himalayas
  • Flood Prone Regions of India
  • Cyclone Formation Requirements
  • Regional Variations in Natural Disasters

PDF preview

Read page by page below. PDF is streamed from the official NCERT website — no download button on this page.

Loading document …
Page of
Loading page …

Questions and Solutions

Question 1

Choose the right answer from the four alternatives given below.

Which one of the following states of India experiences floods frequently?

  1. Bihar
  2. West Bengal
  3. Assam
  4. Uttar Pradesh
Solution: The correct option is (c) Assam.

Assam, along with West Bengal and Bihar, is among the states in India that are highly susceptible to floods. These floods are often an annual occurrence in these regions due to various geographical and meteorological factors.

Question 2

In which one of the following districts of Uttarakhand did the Malpa Landslide disaster take place?
  1. Bageshwar
  2. Champawat
  3. Almora
  4. Pithoragarh
Solution: The correct option is (d) Pithoragarh.

The devastating Malpa landslide disaster occurred in the Pithoragarh district of Uttarakhand, highlighting the vulnerability of hilly regions to such geological events.

Question 3

Which one of the following states receives floods in the winter months?
  1. Assam
  2. West Bengal
  3. Kerala
  4. Tamil Nadu
Solution: The correct option is (d) Tamil Nadu.

While many parts of India experience floods during the monsoon season, Tamil Nadu is known to receive floods during the winter months, primarily due to the retreating monsoon rains.

Question 4

In which of the following rivers is the Majuli River Island situated?
  1. Ganga
  2. Brahmaputra
  3. Godavari
  4. Indus
Solution: The correct option is (b) Brahmaputra.

The Majuli River Island, recognized as one of the largest river islands in the world, is located in the Brahmaputra River in the state of Assam.

Question 5

Under which type of natural hazards do blizzards come?
  1. Atmospheric
  2. Aquatic
  3. Terrestrial
  4. Biological
Solution: The correct option is (a) Atmospheric.

Blizzards are severe weather phenomena characterized by strong winds and heavy snowfall. Therefore, they are classified under atmospheric natural hazards.

Question 6

Answer the following questions in less than 30 words.

When can a hazard become a disaster?

Solution: A natural hazard transforms into a disaster when its impact causes widespread death, loss of property, and significant disruption to social systems, exceeding the community's coping capacity.

Question 7

Why are there more earthquakes in the Himalayas and in the north-eastern region of India?

Solution: The Himalayas and the north-eastern region experience frequent earthquakes because they are located in a seismically active zone where the Indian tectonic plate is converging with the Eurasian plate. This continuous plate movement causes stress accumulation and sudden release of energy, resulting in seismic activity.

Question 8

What are the basic requirements for the formation of a cyclone?

Solution: The basic requirements for the formation of a tropical cyclone include:
  1. A large and continuous supply of warm and moist air.
  2. A strong Coriolis force to prevent the low-pressure center from filling up.
  3. Unstable atmospheric conditions throughout the troposphere.
  4. Absence of a strong vertical wind shear that could disrupt the storm's structure.

Question 9

How are the floods in Eastern India different from the ones in Western India?

Solution: Floods in Eastern India, particularly in states like Assam, West Bengal, and Bihar, are often characterized by extreme precipitation and are a recurring annual feature. In contrast, while Western India can also experience floods, the patterns and primary causes might differ, sometimes involving flash floods or riverine floods influenced by different monsoon dynamics or localized heavy rainfall events, though the provided text focuses more on the high flood proneness of Eastern states.

Common mistakes

  • Confusing hazard with disaster.
  • Not recognizing specific regional patterns of natural events.
  • Incomplete understanding of tectonic plate movement's role in earthquakes.
  • Overlooking the specific conditions required for cyclone formation.

Revision tips

  • Map the flood-prone states of India mentioned in the solutions.
  • Understand the plate tectonic theory as it relates to Himalayan earthquakes.
  • Create a table comparing the characteristics of different natural hazards.
  • Review the conditions necessary for cyclone formation and relate them to real-world events.

Practice MCQs

Q1. Which Indian state is frequently affected by floods?

Q2. The Malpa landslide disaster occurred in which district of Uttarakhand?

Q3. Which of the following is a key requirement for the formation of a cyclone?

Q4. Earthquakes are frequent in the Himalayas due to:

Q5. Blizzards are classified under which type of natural hazard?

Frequently asked questions

What is the difference between a natural hazard and a natural disaster?

A natural hazard is a potential threat in the natural environment that can cause harm. A natural disaster occurs when a hazard strikes, causing widespread death, property loss, and social disruption on a scale that people have little control over.

Which regions in India are most prone to floods?

States like Assam, West Bengal, and Bihar in Eastern India are highly prone to frequent floods, often experiencing them annually.

Why are earthquakes common in the Himalayas?

The Himalayas are seismically active because the Indian tectonic plate is constantly moving northwards and colliding with the Eurasian plate, causing stress and energy release that results in earthquakes.

What are the basic conditions needed for a cyclone to form?

Key conditions include a large supply of warm, moist air, a strong Coriolis force to maintain low pressure at the center, and unstable atmospheric conditions throughout the troposphere.

Where is the Majuli River Island located?

The Majuli River Island, one of the world's largest river islands, is situated in the Brahmaputra River.

How can these NCERT Solutions help with exam preparation?

These solutions provide clear, concise answers to key questions about natural hazards and disasters, helping students understand complex concepts, remember important facts, and prepare for potential exam questions.

Important links

Content reviewed by the NCERT Help team. Editorial Team and update policy

NCERT Solutions PDF PDF on NCERT Help. URL unchanged for search indexing.