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Q28 (IAS/2016) Geography â€ș Indian Physical Geography â€ș Himalayan river systems Official Key

Which of the following is/are tributary/tributaries of Brahmaputra? 1. Dibang 2. Kameng 3. Lohit Select the correct answer using the code given below.

Result
Your answer: —  Â·  Correct: D
Explanation

The correct answer is option D because all three rivers—Dibang, Kameng, and Lohit—are tributaries of the Brahmaputra.

The Brahmaputra receives its main left bank tributaries, namely Dibang (or Sikang) and Lohit[1], after which it is known as the Brahmaputra. Kameng is mentioned as one of the important right bank tributaries of the Brahmaputra[1] along with Subansiri, Manas, and Sankosh.

Additionally, the river called Dihang is joined by the Dibang, the Lohit, and many other tributaries to form the Brahmaputra in Assam[2]. This confirms that both Dibang and Lohit are indeed tributaries that contribute to the formation of the Brahmaputra.

Therefore, all three rivers listed in the question—Dibang (statement 1), Kameng (statement 2), and Lohit (statement 3)—are tributaries of the Brahmaputra, making option D (1, 2 and 3) the correct answer.

Sources
  1. [1] INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.) > Chapter 3: Drainage System > The Brahmaputra System > p. 23
  2. [2] CONTEMPORARY INDIA-I ,Geography, Class IX . NCERT(Revised ed 2025) > Chapter 3: Drainage > The Brahmaputra River System > p. 20
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Q. Which of the following is/are tributary/tributaries of Brahmaputra? 1. Dibang 2. Kameng 3. Lohit Select the correct answer using the code

At a glance
Origin: From standard books Fairness: High fairness Books / CA: 10/10 · 0/10
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This is a classic 'reward for reading' question. It is lifted directly from the NCERT Class XI Drainage chapter. If you missed this, your static geography foundation is shaky. No current affairs or obscure sources were needed—just the core text and a basic mental map of North East India.

How this question is built

This question can be broken into the following sub-statements. Tap a statement sentence to jump into its detailed analysis.

Statement 1
Is the Dibang River a tributary of the Brahmaputra River (India)?
Origin: Direct from books Fairness: Straightforward Book-answerable
From standard books
INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.) > Chapter 3: Drainage System > The Brahmaputra System > p. 23
Presence: 5/5
“Himalayas near Namcha Barwa (7,755 m). The river emerges from the foothills under the name of Siang or Dihang. It enters India west of Sadiya town in Arunachal Pradesh. Flowing southwest, it receives its main left bank tributaries, viz., Dibang or Sikang and Lohit; thereafter, it is known as the Brahmaputra. The Brahmaputra receives numerous tributaries in its 750 km long journey through the Assam valley. Its major left bank tributaries are the Burhi Dihing and Dhansari (South) whereas the important right bank tributaries are the Subansiri, Kameng, Manas and Sankosh. The Subansiri which has its origin in Tibet, is an antecedent river.”
Why this source?
  • Explicitly names Dibang (or Sikang) as a main left-bank tributary received before the river is known as the Brahmaputra.
  • Describes the upper river emerging as Siang/Dihang and then receiving Dibang and Lohit, establishing Dibang's role in forming the Brahmaputra in India.
CONTEMPORARY INDIA-I ,Geography, Class IX . NCERT(Revised ed 2025) > Chapter 3: Drainage > The Brahmaputra River System > p. 20
Presence: 5/5
“The Brahmaputra rises in Tibet east of Mansarowar lake very close to the sources of the Indus and the Satluj. It is slightly longer than the Indus, and most of its course lies outside India. It flows eastwards parallel to the Himalayas. On reaching the Namcha Barwa (7757 m), it takes a 'U' turn and enters India in Arunachal Pradesh through a gorge. Here, it is called the Dihang and it is joined by the Dibang, the Lohit, and many other tributaries to form the Brahmaputra in Assam.”
Why this source?
  • States the river called Dihang is joined by the Dibang and the Lohit to form the Brahmaputra in Assam.
  • Directly links Dibang as one of the tributaries contributing to the Brahmaputra's formation within India.
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Statement analysis

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