Assam Rivers and Tributaries MCQs (1–30)

With Answers and Detailed Explanations

Exam-Oriented for: APSC, ADRE, Assam Police, Assam TET, Grade III & Grade IV, SSC, Railway, Banking, and Other Competitive Examinations

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MCQ 1

1. Which is the largest river flowing through Assam?

A. Barak
B. Brahmaputra
C. Manas
D. Dhansiri

Answer: B. Brahmaputra

Explanation:

The Brahmaputra is the largest and most important river of Assam. It enters Assam from Arunachal Pradesh near Sadiya and flows westward across the state before entering Bangladesh. It forms one of the world’s largest river valleys and supports agriculture, fisheries, transportation, and biodiversity.

• Option A: Barak is the major river of southern Assam.
• Option C: Manas is an important tributary of the Brahmaputra.
• Option D: Dhansiri is also a tributary of the Brahmaputra.

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MCQ 2

2. The Brahmaputra enters Assam near which town?

A. Dhubri
B. Sadiya
C. Guwahati
D. Tezpur

Answer: B. Sadiya

Explanation:

The Brahmaputra enters Assam near Sadiya after flowing through Arunachal Pradesh, where it is known as the Siang (Dihang).

• Dhubri lies near the Bangladesh border.
• Guwahati and Tezpur are located downstream.

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MCQ 3

3. What is the Brahmaputra called in Tibet?

A. Jamuna
B. Siang
C. Tsangpo (Yarlung Tsangpo)
D. Dihang

Answer: C. Tsangpo (Yarlung Tsangpo)

Explanation:

The river originates in Tibet and is known there as the Yarlung Tsangpo. It enters India through Arunachal Pradesh as the Siang (Dihang) and becomes the Brahmaputra in Assam.

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MCQ 4

4. Which river is the principal river of southern Assam?

A. Manas
B. Barak
C. Jia Bharali
D. Dibang

Answer: B. Barak

Explanation:

The Barak River is the lifeline of southern Assam, especially the Barak Valley comprising Cachar, Karimganj, and Hailakandi districts.

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MCQ 5

5. Into which country does the Brahmaputra flow after leaving Assam?

A. Nepal
B. Bhutan
C. Bangladesh
D. Myanmar

Answer: C. Bangladesh

Explanation:

After flowing through Assam, the Brahmaputra enters Bangladesh, where it is known as the Jamuna before joining the Ganga (Padma).

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MCQ 6

6. Which of the following is a north-bank tributary of the Brahmaputra?

A. Kopili
B. Dhansiri
C. Manas
D. Digaru

Answer: C. Manas

Explanation:

The Manas River originates in Bhutan and joins the Brahmaputra from the north.

• Kopili and Dhansiri join from the south.
• Digaru is also a south-bank tributary.

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MCQ 7

7. The Manas River originates in which country?

A. China
B. Nepal
C. Bhutan
D. Bangladesh

Answer: C. Bhutan

Explanation:

The Manas River originates in the Himalayan region of Bhutan and enters Assam before joining the Brahmaputra.

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MCQ 8

8. Which National Park is associated with the Manas River?

A. Kaziranga National Park
B. Dibru-Saikhowa National Park
C. Orang National Park
D. Manas National Park

Answer: D. Manas National Park

Explanation:

Manas National Park, a UNESCO World Heritage Site, lies on the banks of the Manas River.

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MCQ 9

9. Which tributary of the Brahmaputra is famous for the Nameri National Park?

A. Jia Bharali
B. Dhansiri
C. Pagladiya
D. Beki

Answer: A. Jia Bharali

Explanation:

The Jia Bharali River flows beside Nameri National Park, famous for rafting and rich biodiversity.

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MCQ 10

10. Which tributary of the Brahmaputra flows through Kaziranga National Park?

A. Dhansiri (South)
B. Beki
C. Manas
D. Sankosh

Answer: A. Dhansiri (South)

Explanation:

The Dhansiri (South) River flows through Kaziranga National Park and contributes to its rich ecosystem.

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MCQ 11

11. Which river forms Majuli, the world’s largest inhabited river island?

A. Barak
B. Kopili
C. Brahmaputra
D. Dhansiri

Answer: C. Brahmaputra

Explanation:

Majuli has been formed by the Brahmaputra and its distributaries due to continuous deposition and erosion.

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MCQ 12

12. Which river is known for severe erosion in Assam?

A. Brahmaputra
B. Barak
C. Sonai
D. Jiri

Answer: A. Brahmaputra

Explanation:

The Brahmaputra is highly braided and carries enormous sediment, causing severe bank erosion every year.

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MCQ 13

13. Which river originates near Nagaland and joins the Brahmaputra?

A. Dhansiri (South)
B. Manas
C. Sankosh
D. Beki

Answer: A. Dhansiri (South)

Explanation:

The Dhansiri (South) originates in Nagaland and flows through Golaghat district before joining the Brahmaputra.

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MCQ 14

14. Which river is an important tributary of the Barak?

A. Sonai
B. Manas
C. Jia Bharali
D. Beki

Answer: A. Sonai

Explanation:

The Sonai River is one of the important tributaries of the Barak River.

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MCQ 15

15. Which river separates India and Bhutan in some stretches before entering Assam?

A. Manas
B. Kopili
C. Digaru
D. Kulsi

Answer: A. Manas

Explanation:

The Manas River forms part of the India-Bhutan boundary before entering Assam.

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MCQ 16

16. Which tributary joins the Brahmaputra near Guwahati?

A. Kulsi
B. Sonai
C. Jiri
D. Longai

Answer: A. Kulsi

Explanation:

The Kulsi River is an important south-bank tributary joining the Brahmaputra near Guwahati.

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MCQ 17

17. Which river is famous for the presence of the endangered Gangetic river dolphin?

A. Brahmaputra
B. Sonai
C. Longai
D. Jatinga

Answer: A. Brahmaputra

Explanation:

The Brahmaputra supports a significant population of the Gangetic river dolphin, India’s National Aquatic Animal.

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MCQ 18

18. Which tributary originates in Meghalaya and joins the Brahmaputra?

A. Kopili
B. Sankosh
C. Beki
D. Pagladiya

Answer: A. Kopili

Explanation:

The Kopili River originates in Meghalaya and joins the Brahmaputra after flowing through Assam.

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MCQ 19

19. The Barak River eventually flows into which major river system?

A. Godavari
B. Ganga-Padma-Meghna
C. Mahanadi
D. Narmada

Answer: B. Ganga-Padma-Meghna

Explanation:

After entering Bangladesh, the Barak splits into the Surma and Kushiyara rivers and becomes part of the Ganga-Padma-Meghna river system.

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MCQ 20

20. Which is a north-bank tributary of the Brahmaputra?

A. Beki
B. Kopili
C. Digaru
D. Kulsi

Answer: A. Beki

Explanation:

The Beki River originates in Bhutan and joins the Brahmaputra from the north.

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MCQ 21

21. Which river is famous for rafting and angling in Assam?

A. Jia Bharali
B. Sonai
C. Longai
D. Jiri

Answer: A. Jia Bharali

Explanation:

The Jia Bharali is well known for river rafting, angling, and eco-tourism, particularly near Nameri National Park.

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MCQ 22

22. Which district is situated near the point where the Brahmaputra enters Assam?

A. Tinsukia
B. Dhemaji
C. Dibrugarh
D. Goalpara

Answer: B. Dhemaji

Explanation:

The Brahmaputra enters Assam near Sadiya, close to Dhemaji district.

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MCQ 23

23. Which river is formed by the confluence of the Siang and Dibang rivers along with the Lohit before becoming the Brahmaputra?

A. Barak
B. Brahmaputra
C. Kopili
D. Kulsi

Answer: B. Brahmaputra

Explanation:

The Siang, Dibang, and Lohit rivers merge in Arunachal Pradesh to form the Brahmaputra before it enters Assam.

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MCQ 24

24. Which river valley is known as the “Barak Valley”?

A. Brahmaputra Valley
B. Barak River Valley
C. Manas Valley
D. Dhansiri Valley

Answer: B. Barak River Valley

Explanation:

Southern Assam is known as the Barak Valley, named after the Barak River.

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MCQ 25

25. Which river is associated with Dibru-Saikhowa National Park?

A. Brahmaputra
B. Barak
C. Kulsi
D. Sonai

Answer: A. Brahmaputra

Explanation:

Dibru-Saikhowa National Park is situated at the confluence region of the Brahmaputra and Lohit river systems.

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MCQ 26

26. Which river is one of the longest tributaries of the Brahmaputra originating in Meghalaya?

A. Kopili
B. Beki
C. Sankosh
D. Manas

Answer: A. Kopili

Explanation:

The Kopili River is among the longest south-bank tributaries originating in Meghalaya.

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MCQ 27

27. Which tributary of the Brahmaputra is known for causing floods in lower Assam?

A. Pagladiya
B. Sonai
C. Jiri
D. Longai

Answer: A. Pagladiya

Explanation:

The Pagladiya River frequently causes floods and erosion in lower Assam during the monsoon season.

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MCQ 28

28. Which river forms the western boundary of Assam with West Bengal in some stretches?

A. Sankosh
B. Kopili
C. Dhansiri
D. Digaru

Answer: A. Sankosh

Explanation:

The Sankosh River forms part of the boundary between Assam and West Bengal and later joins the Brahmaputra system.

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MCQ 29

29. Which of the following rivers is NOT a tributary of the Brahmaputra?

A. Manas
B. Jia Bharali
C. Barak
D. Kopili

Answer: C. Barak

Explanation:

The Barak River belongs to a separate river system in southern Assam and does not join the Brahmaputra.

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MCQ 30

30. Which statement about Assam’s rivers is correct?

A. The Brahmaputra flows from west to east in Assam.
B. The Barak flows through northern Assam.
C. The Brahmaputra Valley occupies most of Assam.
D. The Manas River originates in Meghalaya.

Answer: C. The Brahmaputra Valley occupies most of Assam.

Explanation:

The Brahmaputra Valley covers the major portion of Assam and is the state’s principal geographical region.

• Option A: Incorrect. The Brahmaputra flows east to west across Assam.
• Option B: Incorrect. The Barak flows through southern Assam.
• Option D: Incorrect. The Manas River originates in Bhutan.

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Quick Revision Facts

• Largest river of Assam: Brahmaputra
• Major river of Southern Assam: Barak
• Brahmaputra enters Assam near: Sadiya
• Name in Tibet: Yarlung Tsangpo
• Name in Bangladesh: Jamuna
• Major north-bank tributaries: Manas, Jia Bharali, Beki, Pagladiya, Sankosh
• Major south-bank tributaries: Kopili, Dhansiri (South), Digaru, Kulsi
• UNESCO National Park on river: Manas National Park
• Nameri National Park river: Jia Bharali
• Kaziranga National Park river: Dhansiri (South)
• World’s largest inhabited river island: Majuli (on the Brahmaputra)
• National Aquatic Animal found in Brahmaputra: Gangetic River Dolphin
• River of Barak Valley: Barak