Rivers and Lakes of India

The correct answer is the Krishna Valley. Nagarjuna Sagar is a major multipurpose irrigation and hydroelectric project constructed across the Krishna River, on the Telangana–Andhra Pradesh region. The governing concept is the identification of river-valley projects by the river on which their dams or reservoirs are built. The reservoir stores Krishna water for irrigation and supports power generation. Narmada Valley refers to projects such as Sardar Sarovar, while the Ganga and Mahanadi valleys contain different projects. Since Nagarjuna Sagar is directly linked with the Krishna River system, option B is correct. The word reservoir does not change the river-system classification.

The correct answer is the Krishna River. Malaprabha rises in the Western Ghats of Karnataka and joins the Krishna river system through its drainage network. The governing geographical concept is a tributary relationship: a smaller river contributes its water to a larger main river, either directly or through another channel. Malaprabha is therefore classified within the Krishna basin, not the Kaveri, Godavari, or Mahanadi basins. The association can be reinforced by remembering other important Krishna tributaries, including Bhima, Tungabhadra, Ghataprabha, and Malaprabha. Thus option C correctly identifies the major river system.

The correct answer is the Krishna system. The Koyna River rises in Maharashtra and is an important tributary of the Krishna River. The governing concept is drainage-basin classification: rivers are grouped according to the larger river system into which their water ultimately flows. Koyna is also associated with the Koyna hydroelectric project and dam, but the question asks for its river system rather than the project itself. The Ganga and Brahmaputra systems drain northern and northeastern parts of India, while the Mahi has a separate west-flowing basin. Because Koyna contributes to the Krishna basin, option A is correct.

The correct answer is the Yamuna. The Betwa rises in Madhya Pradesh and flows through the Bundelkhand region before joining the Yamuna. The governing concept is the hierarchy of river systems: Betwa is a tributary, Yamuna is the larger receiving river, and Yamuna itself is part of the Ganga basin. The Ken is another important river of the Bundelkhand area, but the question specifically asks about Betwa. Narmada and Mahanadi have separate drainage basins and do not receive the Betwa. Therefore, tracing the river downstream leads to the Yamuna, making option C correct.

The Pennar, also called the Penna, is an east-flowing river of peninsular India, so option B is correct. It rises in the interior uplands and generally moves across parts of Karnataka and Andhra Pradesh toward the eastern coast. Since the Bay of Bengal lies east of the Indian peninsula, the river ultimately drains into it. The question asks for the main overall direction, although a river may make smaller bends along its course. Westward flow would normally lead toward the Arabian Sea, while northward or southward are not the dominant directions of the Pennar’s complete course. The governing concept is the relationship between peninsular relief, broad river direction, and the sea into which the river drains.

The correct answer is Kerala. The Periyar is the longest river in Kerala and is an important source of water for domestic use, irrigation, and electricity generation in the state. The governing concept is the regional association of a river with the state through which it mainly flows and where its basin has major importance. The river is also connected with the Idukki reservoir and hydroelectric project, although the Periyar basin extends into a wider geographical setting. Tamil Nadu, Karnataka, and Andhra Pradesh have other major rivers and projects, but Periyar is most strongly identified with Kerala. Therefore, option A is correct.

The correct answer is Mount Abu. Nakki Lake is a well-known lake situated at Mount Abu in Rajasthan, which is a hill station in the Aravalli Range. The governing concept is the geographical association between a notable lake and the hill station where it is located. Mount Abu is Rajasthan’s prominent hill station, and Nakki Lake is one of its principal tourist and geographical landmarks. Nainital is associated with Naini Lake in Uttarakhand, Ooty with lakes and hills in the Nilgiris, and Shillong with lakes and upland landscapes of Meghalaya. Since Nakki Lake is located at Mount Abu, option A is correct.

The correct answer is Udaipur. Pichola Lake is a famous artificial freshwater lake in Udaipur, Rajasthan, and it is an important part of the city’s historic landscape and tourism. The governing concept is the identification of lakes by their associated city. Udaipur is popularly known as the City of Lakes because of Pichola, Fateh Sagar, and other notable water bodies. Jaipur is associated with a different urban and historical setting, Jodhpur is known for its blue-city landscape and forts, and Ajmer is associated with Ana Sagar and Pushkar’s nearby pilgrimage region. Thus the city–lake pair Pichola–Udaipur makes option B correct.

The governing geographical concept is river-system hierarchy: a tributary is a smaller stream that joins a larger trunk river, and its basin is identified through that connection. The Manas rises in the Himalayan region of Bhutan, flows southward through or along the Bhutan–India region, and joins the Brahmaputra system in Assam. Therefore option A is correct. The Ganga and Indus systems belong to different drainage networks, while the Krishna is a Peninsular river of southern India. Remembering the Manas with the Brahmaputra also helps distinguish it from other Himalayan tributaries such as the Teesta and Subansiri.

The governing concept is the geographical association between a river, its source region and the state through which it mainly flows. The Dibang rises in the highlands of Arunachal Pradesh and flows through that state before joining the Brahmaputra system in the eastern part of the region. Hence option B is correct. Mizoram is associated with rivers such as the Tlawng and Tuirial, Tripura with systems including the Gomati and Manu, and Meghalaya with rivers such as the Simsang and Myntdu. The Dibang is also commonly remembered with the Lohit and Siang as important northeastern contributors to the Brahmaputra.

The governing concept is drainage-basin connection. The Lohit is an important river of the eastern Himalayan region, flowing through Arunachal Pradesh and joining the Brahmaputra system in Assam. Once it joins that larger river network, its waters ultimately move through the Brahmaputra basin toward the plains and the Bay of Bengal. Therefore option C is correct. The Narmada, Godavari and Kaveri are major Peninsular river systems with different courses and drainage basins. A useful memory link is that Lohit, Dibang and Siang are major northeastern rivers associated with the Brahmaputra system, not with the large west- or south-flowing Peninsular rivers.

The correct answer is Gujarat because Ahmedabad is situated on the banks of the Sabarmati River in Gujarat. The Sabarmati rises in the Aravalli region of Rajasthan, enters Gujarat, flows through or near important places including Ahmedabad, and finally drains into the Gulf of Khambhat, an inlet of the Arabian Sea. This drainage direction identifies it as a west-flowing peninsular river. Rajasthan is relevant to its source region, but not the state associated with Ahmedabad. Maharashtra and Madhya Pradesh are also not the state through which the river flows at Ahmedabad. Therefore, option D is the only geographically precise answer.

The governing concept is the distinctive course and drainage direction of Indian rivers. The Mahi is a west-flowing peninsular river that rises in Madhya Pradesh, passes through Rajasthan and Gujarat, and eventually enters the Arabian Sea through the Gulf of Khambhat. During its course, it crosses the Tropic of Cancer twice, which is an unusual geographical feature and the fact tested here. Therefore, option A is correct. Option B is incorrect because the Mahi is not the longest tributary of the Ganga. Option C is wrong because the river is not confined to the Himalayas; it belongs to the peninsular drainage system. Option D is also incorrect because the Mahi flows westward to the Arabian Sea rather than eastward to the Bay of Bengal.

Option A is correct: the Son River is generally described as rising near the Amarkantak region in Madhya Pradesh. It then flows broadly east or north-east through central and eastern India before joining the Ganga near Patna. The Amarkantak area is also associated with the source of the Narmada, which can make this question confusing, but that association does not make the Son answer wrong. Talakaveri is the source of the Kaveri, Mahabaleshwar is associated with the Krishna, and Trimbakeshwar is associated with the Godavari. These alternatives belong to different peninsular river systems.

Option B is correct because the Gandak rises in the Nepal Himalaya and enters the plains of India from Nepal. It flows through the northern part of Bihar and joins the Ganga near Patna. The river is therefore an important Himalayan tributary of the Ganga, with a transboundary course between Nepal and India. Bhutan has other Himalayan drainage systems, while Myanmar is not connected with the Gandak basin. Although many Himalayan rivers ultimately have headwaters in areas associated with Tibet or the wider Himalayan region, the country from which the Gandak enters India in this school-level question is Nepal. Hence option B is unambiguous.

Option C is correct because the Ghaghara is a major Himalayan tributary of the Ganga. It rises in the high Himalayan region, flows through Nepal and northern India, and joins the Ganga in the Gangetic plain. In the usual river-system classification, Ghaghara, Gandak and Kosi are important northern or left-bank tributaries of the Ganga. Narmada and Krishna are major peninsular rivers with separate drainage basins, while the Brahmaputra belongs to a different Himalayan river system and joins the Ganga system farther downstream through the Padma in Bangladesh. Therefore, the direct parent river asked here is the Ganga.

Option A is correct because Chopta and Roopkund are Himalayan locations associated with Uttarakhand. Roopkund is a high-altitude glacial lake in the Garhwal Himalaya, while Chopta is a mountain destination in the same broad Himalayan state. The question is testing regional association rather than a calculation: high Himalayan lakes and alpine landscapes in this context point to Uttarakhand. Gujarat is mainly associated with western Indian plains, coasts and semi-arid landscapes; Odisha is on the eastern coast; and Tamil Nadu lies in the southern peninsula. Although other Himalayan lakes occur in Jammu and Kashmir, Ladakh, Himachal Pradesh and Sikkim, none of the given alternatives competes with Uttarakhand.

Option B is correct because Tso Moriri is a high-altitude lake located in the Changthang region of Ladakh. It is a significant endorheic lake, meaning its water does not flow directly into the sea through a normal river outlet. Tso Moriri is often studied together with Pangong Tso as an important lake of the cold, high-altitude Ladakh landscape. Jammu and Kashmir is a neighbouring Union Territory with different well-known lakes, but Tso Moriri is administratively in Ladakh. Puducherry and the Andaman and Nicobar Islands are geographically distant and have entirely different physical settings. Therefore, Ladakh is the only correct location.

Option C is correct because Suraj Tal is located near the Baralacha La pass in Himachal Pradesh. It lies in the high-altitude Lahaul-Spiti region and is associated with the upper Bhaga drainage area. The name Baralacha La is therefore the key geographical link in this question. Rohtang Pass is also in Himachal Pradesh but is located farther west and is a separate pass, so it is a plausible distractor. Nathu La is in Sikkim, while Zoji La connects the Kashmir Valley with the Ladakh region. Since the lake is specifically linked with the Baralacha La landscape, option C is the unambiguous answer.

The correct answer is Chenab. In the upper Himalayan region of Himachal Pradesh, the Chandra and Bhaga are two important headstreams. They meet at Tandi, near Keylong in the Lahaul-Spiti region, and the combined stream is traditionally called Chandrabhaga. After entering the Jammu region, this river is widely known as the Chenab. Ravi, Jhelum and Beas are also important rivers of the Indus drainage system, but none of them is formed by the confluence of Chandra and Bhaga. Thus, the geographical sequence is Chandra plus Bhaga equals Chandrabhaga, later called Chenab.