Class 9 Geography Chapter 3: Drainage

Class 9 Geography  Chapter 3: Drainage

Basic Drainage Concepts

  • Q: What is meant by the term 'drainage'?

    • A: It describes the river system of an area.

  • Q: What is a 'drainage basin'?

    • A: The area drained by a single river system is called a drainage basin.

  • Q: What is a 'water divide'?

    • A: Any elevated area, such as a mountain or an upland, that separates two drainage basins is known as a water divide (e.g., the Ambala water divide between the Indus and Ganga river systems).

  • Q: Which is the world's largest drainage basin?

    • A: The Amazon River basin in South America.

The Himalayan Rivers

  • Q: Where does the river Indus originate?

    • A: It originates in Tibet, near Lake Mansarovar.

  • Q: According to the Indus Water Treaty (1960), what percentage of the Indus river system's water can India use?

    • A: India can use only 20% of the total water carried by the Indus river system.

  • Q: What are the two headwaters of the Ganga?

    • A: The Bhagirathi (originating from the Gangotri Glacier) and the Alaknanda.

  • Q: Where do the Bhagirathi and Alaknanda join to form the Ganga?

    • A: They meet at Devaprayag in Uttarakhand.

  • Q: Which river is known as the Tsangpo in Tibet and Jamuna in Bangladesh?

    • A: The Brahmaputra River.

  • Q: Around which mountain peak does the Brahmaputra take a 'U-turn' to enter India?

    • A: Namcha Barwa (7,757 meters).

The Peninsular Rivers

  • Q: Which are the only two long Peninsular rivers that flow west and make estuaries?

    • A: The Narmada and the Tapi.

  • Q: Where does the Narmada river originate?

    • A: It rises in the Amarkantak hills in Madhya Pradesh.

  • Q: Which famous waterfalls are formed by the Narmada river flowing over steep rocks?

    • A: The 'Dhuadhar falls' near Jabalpur.

  • Q: Which is the largest Peninsular river?

    • A: The Godavari River.

  • Q: Why is the Godavari often referred to as the 'Dakshin Ganga'?

    • A: Because of its large length and the massive area it covers in southern India.

  • Q: What is the name of the second biggest waterfall in India, which is made by the river Kaveri?

    • A: Sivasamudram falls.

Lakes in India

  • Q: Which is the largest freshwater lake in India?

    • A: Wular Lake in Jammu and Kashmir, which is the result of tectonic activity.

  • Q: Name an important saltwater lake in Rajasthan used for producing salt.

    • A: The Sambhar Lake.

  • Q: What is a lagoon?

    • A: A shallow body of salt water separated from the sea by sandbars or spits (e.g., Chilika lake, Pulicat lake, and Kolleru lake on the eastern coast).

  • Q: Why was the Guru Gobind Sagar (Bhakra Nangal Project) created?

    • A: It is a man-made lake created by damming rivers for the generation of hydel power.

Rivers and the Economy

  • Q: What does NRCP stand for?

    • A: National River Conservation Plan, which aims to improve the water quality of major rivers through pollution abatement works.


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