Rivers and Lakes of India

Correct answer: A. Dihang

The correct answer is Dihang, also called Siang in parts of Arunachal Pradesh. In Tibet, the river is known as the Yarlung Tsangpo or Tsangpo. After cutting across the Himalayas and entering Arunachal Pradesh, it is commonly called Dihang or Siang. Farther downstream, the Dihang joins the Lohit and Dibang rivers near the eastern part of Assam; after this major confluence, the combined river is known as the Brahmaputra in Assam. Lohit is therefore a tributary rather than the name of the entire post-entry course. Kali is a separate Himalayan river associated with the Kali or Mahakali system, and Bhagirathi is a headstream of the Ganga. The sequence of changing names makes Dihang the appropriate answer.

Correct answer: C. Brahmaputra

The correct answer is Brahmaputra. The river is known as Yarlung Tsangpo or Tsangpo in Tibet and as Dihang or Siang after entering Arunachal Pradesh. In the eastern part of Assam, Dihang joins the Lohit and Dibang rivers. After this important confluence, the combined channel is known mainly as the Brahmaputra as it flows westward through the Assam Valley. Subansiri is another major tributary of the Brahmaputra, not the name of the combined main river. Teesta is a separate Himalayan river that joins the Brahmaputra system farther downstream in Bangladesh, while Meghna is the name of a major river in Bangladesh formed within the Ganga–Brahmaputra–Meghna delta system. The sequence of regional names and confluences therefore makes Brahmaputra unambiguous.

Correct answer: B. Narmada

A delta develops when a river loses speed near its mouth and deposits sediment in several distributary channels. An estuary is a broad, tidal river mouth where freshwater mixes with seawater; strong tidal action can remove or redistribute sediment and prevent the formation of a large delta. The Narmada flows westward through a rift valley and enters the Arabian Sea near the Gulf of Khambhat through an estuarine mouth. Therefore option B, Narmada, is correct. Godavari, Krishna, and Mahanadi flow generally eastward and are well known for forming large deltas on the Bay of Bengal coast. The answer depends on identifying the river-mouth landform and drainage direction, not simply on comparing river lengths. The contrast between estuary-forming Narmada and delta-forming east-flowing rivers makes the choice unambiguous.

Correct answer: B. Mahi

The governing concept is the identification of a river by its source region and final drainage outlet. The Mahi rises in the Vindhyan or Aravalli-related upland region of central-western India and flows generally southwest through Rajasthan and Gujarat before entering the Gulf of Khambhat, which is part of the Arabian Sea. Thus option B is correct. Luni mainly drains toward the marshy Rann of Kachchh, while Ghaggar is an inland or ephemeral river system and Banganga does not follow the stated course to the Gulf of Khambhat. The outlet is the decisive clue.

Correct answer: B. Kali

The correct answer is the Kali River, which is also called the Sharda or Mahakali in different stretches. It rises in the Himalayan region and forms, or is associated with, part of the boundary between Nepal and India before flowing into the plains. Gandak and Kosi are important Himalayan tributaries of the Ganga, but neither is commonly identified by the name Sharda. Teesta flows through Sikkim, West Bengal and Bangladesh and is not the India-Nepal boundary river described here. The clue combines an alternative name with a geographical boundary, so option B is unambiguous.

Correct answer: A. Bihar

The governing concept is the drainage relationship between a tributary and its main river. The Ghaghara, known as the Karnali in its upper Himalayan course, enters the northern plains and flows through the Uttar Pradesh region before joining the Ganga near Chhapra in Bihar. Thus Bihar is the appropriate answer, and option A is correct. Kerala and Maharashtra are peninsular states with different drainage systems, while Rajasthan lies outside the Ghaghara’s route. The question is not asking where the river rises or which state it first enters; it asks where its important confluence with the Ganga occurs. Tracing the river downstream to its meeting point with the Ganga distinguishes Bihar from the plausible but geographically unrelated alternatives.

Correct answer: B. Ganga river system

The governing concept is classification of a river according to the larger drainage basin into which it ultimately flows. The Saryu, especially the river associated with Ayodhya, is commonly linked in school geography with the Ghaghara. The Ghaghara is a major tributary of the Ganga, so the Saryu is generally placed in the Ganga river system. Therefore option B is correct. The Godavari drains much of peninsular India toward the east, the Narmada flows westward into the Arabian Sea, and the Indus system belongs mainly to the northwestern drainage region. Regional names can create some confusion because “Saryu” is used locally, but the standard school-level association through the Ghaghara is with the Ganga system.

Correct answer: B. Ganga

The governing concept is the distinction between a tributary and the main river receiving its water. The Ramganga rises in the Kumaon region of Uttarakhand, flows through the Himalayan foothills and northern plains, and joins the Ganga in Uttar Pradesh. It is therefore a tributary of the Ganga, making option B correct. The Yamuna is another major tributary of the Ganga, but Ramganga does not join the Yamuna. Narmada and Tapi are west-flowing peninsular rivers with separate drainage routes and are not connected with the Ramganga’s confluence. Identifying the river’s downstream course, rather than merely its Himalayan origin, gives the required answer.

Correct answer: A. Rohtang Pass

The key geographical association is between the Beas, Beas Kund and Rohtang Pass. The Beas is traditionally regarded as originating from Beas Kund, a high-altitude source near Rohtang Pass in Himachal Pradesh. From there it flows through the Kullu Valley and later joins the Sutlej. Thus option A is correct. Nathu La is located in Sikkim, Khardung La is in the Ladakh region, and Shipki La lies near the Himachal Pradesh–Tibet border. Shipki La may seem plausible because it is also in Himachal Pradesh, but it is not the traditional source location of the Beas. Remembering the source pair “Beas Kund–Rohtang Pass” resolves the question accurately.

Correct answer: A. Bhaga and Chandra

The governing concept is the formation of a river through the confluence of two headwater streams. In Himachal Pradesh, the Chandra and Bhaga streams meet at Tandi in the Lahaul region. Their combined flow is known as the Chandrabhaga and is later commonly called the Chenab after entering the Jammu region. Therefore option A is correct. Jhelum and Ravi are separate rivers of the Indus system, not the streams that form the Chenab. Beas and Sutlej have their own courses and do not create the Chenab, while Spiti and Parvati are unrelated to this confluence. The names may be listed in either order, but the essential pair is Chandra–Bhaga.

Correct answer: A. Ravi

The correct answer is the Ravi. The Ujh is a smaller river of the Jammu region and joins the Ravi drainage in the broader Indus river system. Its location makes it useful for understanding the network of tributaries in the northwestern Himalayan and border areas. The Sutlej, Jhelum and Beas are also important rivers of the Indus basin, but the Ujh is not conventionally listed as a tributary of any of them. The question asks for the immediate larger river, not merely the ultimate basin; although Ravi itself belongs to the Indus system, Ujh is specifically associated with Ravi. Therefore option A is correct.

Correct answer: A. Sutlej

The governing concept is tracing a tributary to the larger drainage system that receives its water. The Spiti is a high-altitude river of Himachal Pradesh. It flows through the cold, dry Spiti Valley and joins the Sutlej near Khab. After this confluence, its water becomes part of the Sutlej basin and ultimately the wider Indus system. Therefore option A is correct. The Yamuna belongs to the Ganga drainage system, while the Godavari and Kaveri are major peninsular rivers of southern India. The wording is important: Spiti does not usually join the main Indus River directly; it first joins the Sutlej, which carries its flow into the Indus system. This downstream relationship identifies the answer.

Correct answer: B. Bangladesh

The correct answer is Bangladesh. The Teesta rises in the Himalaya of Sikkim, flows through Sikkim and West Bengal, and then crosses into Bangladesh. There it joins the Jamuna, which is the name used in Bangladesh for the main channel of the Brahmaputra, before the river system continues toward the Ganga-Padma and Meghna network. Nepal and Bhutan are part of the broader Himalayan drainage region but are not the country where this confluence takes place. Myanmar has no role in the Teesta’s course. Therefore the international route and final confluence clearly identify option B.

Correct answer: A. Brahmaputra

The correct answer is the Brahmaputra. The Subansiri rises in the Himalayan region, flows through Arunachal Pradesh and Assam, and joins the Brahmaputra in Assam. It is one of the important northern-bank tributaries of the Brahmaputra and contributes substantial water and sediment to the river system. The Ganga basin lies to the west and south, while Narmada and Krishna are peninsular rivers with entirely different courses and drainage patterns. The location in northeastern India and the tributary relationship are the key clues. Hence option A correctly identifies the large river receiving the Subansiri.

Correct answer: A. Barak river system

The governing concept is the association of regional rivers with the larger drainage basin to which they belong. Tuiwai and Tuirial are rivers of Mizoram in northeastern India, and their regional drainage is mainly connected with the Barak system and the associated northeastern river network. Therefore option A is the intended answer. The Narmada and Sabarmati systems are located in central and western India, while the Kaveri system belongs to the southern peninsula. Those alternatives are inconsistent with the location clue. The question uses the state and river names together, so identifying northeastern India first and then matching its major drainage network leads to the Barak system.

Correct answer: A. Krishna system

A river system includes a main river, its tributaries, and the connected drainage area. The Mula and Mutha flow through the Pune region and join the Bhima drainage network. The Bhima is a major tributary of the Krishna River, so the water carried by the Mula and Mutha ultimately belongs to the Krishna basin. Therefore, option A is correct. The Ganga, Indus, and Brahmaputra systems drain different parts of the subcontinent and have no downstream connection with these Pune rivers. The question concerns the larger drainage system, not merely the river flowing closest to Pune. This distinction between a local tributary and its ultimate river basin is the governing geographical concept.

Correct answer: A. It crosses the Tropic of Cancer twice

Option A is correct: the Mahi River is noted for crossing the Tropic of Cancer twice. This unusual course results from the river’s looping path through parts of Madhya Pradesh, Rajasthan and Gujarat before it drains into the Gulf of Khambhat. The statement is a distinctive geographic fact used to identify the river in examinations. The Mahi is not the longest tributary of the Ganga, so option B is incorrect. It is a mainly rain-fed peninsular river rather than an entirely glacial river, ruling out C, and it reaches the sea rather than remaining an inland desert stream, ruling out D.

Correct answer: A. Luni system

The Luni system is the correct answer. Sukri and Jawai are tributaries associated with the Luni drainage of western Rajasthan and adjoining areas. The Luni rises near the Aravalli region and flows through an arid landscape, where many channels are seasonal and their discharge is strongly dependent on rainfall. This explains why these rivers are studied as part of a desert or inland-drainage setting. The Godavari and Kaveri are major peninsular systems of central and southern India, while the Brahmaputra is a Himalayan river system of the northeast. Thus only option A fits both the tributaries and the desert-region clue.

Correct answer: A. Ganga system

The Ganga system is the correct answer through a sequence of tributary relationships. The Rihand, also known as the Renu or Rehand in some references, is a tributary of the Son River. The Son then joins the Ganga near Patna, so the chain is Rihand to Son to Ganga. This step-by-step drainage logic explains why the Rihand belongs to the Ganga basin even though it does not directly join the Ganga. The Kaveri and Mahi are separate peninsular systems, while the Indus system drains toward the northwest. Hence option A is the only appropriate answer.

Correct answer: A. Godavari system

The correct answer is the Godavari river system. The Wainganga flows through parts of Madhya Pradesh and Maharashtra and joins the Wardha to form the Pranhita, which then enters the Godavari. This makes Wainganga an important upstream component of the Godavari drainage network, even though it may first appear as a separate regional river. The Indus system is mainly associated with the northwestern Himalayas, while Kaveri is a separate southern basin. Sabarmati is a west-flowing river of Gujarat and Rajasthan and does not connect with the Godavari network. Following the sequence Wainganga plus Wardha, then Pranhita, then Godavari provides the reasoning for option A.

Correct answer: A. Brahmaputra system

The correct answer is the Brahmaputra river system. Dibru-Saikhowa is a protected wetland and national park landscape in Assam, situated within the broad floodplain environment shaped by the Brahmaputra and its tributaries. Its wetlands, grasslands and river channels reflect the heavy monsoon flow, sediment deposition and shifting courses characteristic of the Brahmaputra valley. Narmada flows westward through central India, Krishna drains the Deccan plateau toward the Bay of Bengal, and Luni is an inland-draining river of arid Rajasthan. None of those systems creates the Assam floodplain environment. The regional location in Assam and the associated alluvial wetlands therefore make option A correct.

Correct answer: C. Narmada

The correct answer is Narmada. The Narmada rises near Amarkantak in central India and flows westward through a structural rift valley before entering the Gulf of Khambhat. Its course is closely associated with hard basaltic formations of the Deccan Trap region and the Narmada–Son lineament. Therefore, option C is correct. Mahi also flows westward to the Gulf of Khambhat, which makes it a plausible distractor, but its source and drainage route are different. Sabarmati drains through Gujarat to the Gulf of Khambhat, while Luni ends in the Rann of Kachchh and does not reach that gulf. The key clues are the Narmada’s central Indian source, rift-valley course and westward outlet.

Correct answer: A. Dhasan

The correct answer is Dhasan. The Dhasan is an important river of the Bundelkhand region and is commonly studied with the Betwa and Ken rivers in the drainage geography of central India. Dhasan is also associated with the Betwa system, which ultimately forms part of the Yamuna–Ganga drainage network. Bundelkhand’s rivers are strongly influenced by the hard, uneven peninsular terrain and seasonal monsoon rainfall, so their discharge varies through the year. Tapi is a west-flowing river of central India, Periyar is a major river of Kerala, and Teesta is a Himalayan river of Sikkim and North Bengal. Their regional settings do not match the Bundelkhand clue.

Correct answer: A. They cut across the Eastern Ghats

The correct answer is that these rivers cut across the Eastern Ghats. Mahanadi, Godavari, Krishna, and Cauvery generally flow eastward across peninsular India and drain into the Bay of Bengal. On their way to the coast, their valleys and erosional channels interrupt the continuity of the Eastern Ghats. Consequently, the range appears as separate hill sections rather than as one unbroken wall. This is the meaning of a discontinuous range in physical geography. The rivers do not cover the Western Ghats, create Himalayan glaciers, or directly form coral islands. Those alternatives describe unrelated geographical processes. Therefore, river incision and valley formation explain the broken character of the Eastern Ghats.

Correct answer: C. Mahanadi, Godavari, Krishna, and Cauvery cut them

Option C is correct. The Eastern Ghats are not a continuous wall because several major rivers flowing generally eastward cut across them on their way to the Bay of Bengal. The Mahanadi, Godavari, Krishna, and Kaveri have carved valleys and gaps through different sections of the range, interrupting its continuity. The Indus and Jhelum belong mainly to the northwestern river system and do not explain the Eastern Ghats. Narmada and Tapi flow westward and do not cover this range, while the Ganga and Yamuna are northern rivers with no such meeting pattern in the Eastern Ghats. The river evidence therefore supports C.