NCERT Class 9 Geography — Chapter 2: Physical Features of India

mcqeasy

In the context of the Himalayas, what are 'Duns'?

Official previous-year question

Verified 1 Aug 2026.

Options

AGlaciers in the Great Himalayas
BDeep gorges carved by rivers
CHigh altitude lakes
DLongitudinal valleys between lesser Himalaya and Shiwaliks

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Solution

The correct option is

Longitudinal valleys between lesser Himalaya and Shiwaliks

Explanation

The Himalayas consist of three parallel ranges: the Great Himalayas (Himadri), the Lesser Himalayas (Himachal), and the Outer Himalayas (Shiwaliks). The longitudinal valleys found between these ranges are significant physiographic features.

Detailed Analysis:

Duns are longitudinal valleys formed between the Lesser Himalayas and the Shiwaliks.
These valleys are filled with sediment and gravel brought down by the Himalayan rivers. As the Shiwalik range rose, it obstructed the flow of rivers, leading to the accumulation of sediments in these depressions.
Unlike deep gorges carved by erosion or high-altitude glacial lakes, Duns are structural valleys characterized by their flat floors and agricultural utility.
Prominent examples include Dehra Dun, Kotli Dun, and Patli Dun. Dehra Dun is the largest and most well-known among them.

Key Takeaway: Duns are specific longitudinal valleys situated between the Lesser Himalayas and the Shiwalik range, distinct from other Himalayan features like passes, gorges, or glacial lakes.

Your note

More from Chapter 2: Physical Features of India

Which of the following is the highest peak in the Eastern Ghats?

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The Chilika Lake is an important feature along the eastern coast. It lies in the state of:

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Consider the following statements regarding the Central Highlands: 1. They are wider in the west but narrower in the east. 2. The eastward extensions are known as the Malwa Plateau. 3. The Chotanagpur plateau marks the further eastward extension. Which of the statements given above is/are correct?

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Consider the following statements regarding the rivers of the Northern Plains: 1. In the lower course, the velocity of the river decreases due to gentle slope. 2. The decrease in velocity prevents the formation of any depositional features. 3. The rivers in their lower course split into numerous channels known as tributaries. Which of the statements given above is/are correct?

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Which of the following hills are located to the southeast of the Eastern Ghats? 1. Shevroy Hills 2. Javadi Hills 3. Cardamom Hills 4. Anaimalai Hills Select the correct answer using the code given below:

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The correct option is

Longitudinal valleys between lesser Himalaya and Shiwaliks

Explanation

Detailed Analysis:

Duns are longitudinal valleys formed between the Lesser Himalayas and the Shiwaliks.
These valleys are filled with sediment and gravel brought down by the Himalayan rivers. As the Shiwalik range rose, it obstructed the flow of rivers, leading to the accumulation of sediments in these depressions.
Unlike deep gorges carved by erosion or high-altitude glacial lakes, Duns are structural valleys characterized by their flat floors and agricultural utility.
Prominent examples include Dehra Dun, Kotli Dun, and Patli Dun. Dehra Dun is the largest and most well-known among them.

Key Takeaway: Duns are specific longitudinal valleys situated between the Lesser Himalayas and the Shiwalik range, distinct from other Himalayan features like passes, gorges, or glacial lakes.