Rivers and Lakes of India

The correct answer is Godavari. The Purna is generally identified as a tributary of the Godavari and belongs to the peninsular drainage system of western and central India. It should not be confused with rivers that have similar names in other parts of the country. The Brahmaputra is a major Himalayan river of the northeast, while Jhelum is a Himalayan tributary of the Indus system. Gandak is another Himalayan tributary that joins the Ganga in the northern plains. The Purna’s association with the Godavari is established by its basin location and connection with the Deccan drainage network. Therefore, option A is correct, whereas options B, C and D belong to distinct northern river systems.

The correct answer is Beas and Sutlej. Harike Wetland is located in Punjab near the meeting point of the Beas and Sutlej rivers. The Beas flows southward and joins the Sutlej at Harike, creating an important riverine wetland and a significant habitat for resident and migratory birds. The question tests the association between a major Indian wetland and its river system. Ganga and Son meet in Bihar, not at Harike; Narmada and Tawa are central Indian rivers; and Krishna and Bhima belong to the Deccan drainage system. Therefore, option A is the only geographically correct pair.

The Brahmaputra is called the Yarlung Tsangpo, or simply Tsangpo, in Tibet, so option B is correct. The river rises in the Tibetan region and flows eastward across the Tibetan Plateau. After entering India through Arunachal Pradesh, its upper course is known as the Siang or Dihang; farther downstream in Assam it is called the Brahmaputra. These regional names refer to connected sections of the same Himalayan river. The Indus, Sutlej, and Teesta are separate rivers with different courses and identities. The name Tsangpo is therefore the essential clue. Recognising regional names is important because major transboundary rivers often receive different names in different countries and cultural regions.

Most major peninsular rivers of India flow eastward because the Deccan Plateau generally slopes toward the Bay of Bengal. Narmada is an important exception. It rises near Amarkantak and travels west through a long rift valley between the Vindhya range in the north and the Satpura range in the south. It finally reaches the Arabian Sea through the Gulf of Khambhat.

Thus Narmada is the correct choice, option C. Mahanadi, Godavari, and Kaveri generally flow eastward and form deltas on the Bay of Bengal coast. Their usual direction does not match the westward course asked about. The answer and explanation are therefore accurate.

Wular Lake is linked with the Jhelum River system in the Kashmir Valley. It is a large freshwater lake through which the Jhelum flows, so its valley association is generally identified as the Jhelum valley. Thus, option A is correct. The question asks about a river valley, not merely the state or region where the lake is located.

The other listed rivers do not provide the standard geographical association for Wular Lake. Chenab and Ravi are important Himalayan rivers, but Wular is specifically connected with the Jhelum drainage system. Beas is associated mainly with the Punjab and Himachal region and is not the river connected with Wular. Therefore, remembering the Jhelum–Wular relationship leads directly to answer A.

Loktak Lake in Manipur is especially famous for phumdis, floating masses made from intertwined living and decaying vegetation, soil, and other organic material. Therefore, option C is correct. Phumdis are not ordinary islands of solid rock; they are buoyant ecological formations that can support plants, animals, and, in some places, human activity. Their presence gives Loktak a distinctive wetland character and makes it internationally notable. Saline marshes are associated with salt-rich wetlands, coral reefs develop mainly in warm shallow marine waters, and sand dunes are wind-shaped accumulations of sand. None of those features identifies Loktak as precisely as phumdi floating islands. The key concept is the lake’s characteristic floating wetland ecosystem.

The Yamuna is generally considered the longest tributary of the Ganga, so option A is correct. It rises near the Yamunotri Glacier in Uttarakhand, flows through the northern plains, and joins the Ganga at the Triveni Sangam near Prayagraj. Its long course and extensive drainage basin make it the best answer among the listed tributaries. Son, Gandak, and Kosi are also important tributaries, but their courses are generally shorter than that of the Yamuna. The question asks specifically about length, not discharge, flood severity, or economic importance. A river may carry more water or cause more flooding without being the longest. The governing reasoning is therefore a comparison of the tributaries’ overall courses.

The Mahanadi originates near Sihawa in the Dhamtari region of Chhattisgarh and flows generally eastward before emptying into the Bay of Bengal. Therefore, option B is correct. Its basin extends across parts of central and eastern India and supports agriculture, settlements, and several irrigation and water-resource projects. The location of the source and the direction of flow together provide a clear identification clue. Tapi and Narmada rise in central India but flow westward toward the Arabian Sea. Mahi also follows a westward course and reaches the Arabian Sea. Thus, among the choices, only the Mahanadi matches both Sihawa as the source area and the Bay of Bengal as the outlet.

Pulicat Lake is a large brackish-water lagoon on the southeastern coast of India. It lies along the coastal area shared by Andhra Pradesh and Tamil Nadu, with most of the lagoon extending in Andhra Pradesh and its southern portion near Tamil Nadu. Its position near the boundary of these two states is the central geographic fact needed for the answer.

The other state pairs are not associated with Pulicat Lake. Kerala and Tamil Nadu are farther to the southwest, Karnataka and Goa lie on the west coast, and Odisha and Andhra Pradesh are associated with other coastal lagoons and river systems. Since Pulicat is beside the Andhra Pradesh–Tamil Nadu boundary, option D is correct. The word “near” is important because the lake is not required to lie equally within both states.

The Sutlej is considered to rise in the Tibetan Plateau near the region of Rakshastal, close to Mount Kailash. It then flows generally westward through Tibet and enters India in Himachal Pradesh before continuing toward the Punjab plains. Therefore, option A, Sutlej, is the correct answer.

The other choices have different source regions. The Ravi rises in the Himalayas of Himachal Pradesh, the Jhelum rises near Verinag in the Kashmir region, and the Chambal rises in the Vindhyan area of Madhya Pradesh. The reference to the Tibetan region and Rakshastal is the key clue for identifying the Sutlej. Some descriptions differ slightly about the exact source location, but the standard school-level answer remains Sutlej.

The Luni is the principal river of the arid region of Rajasthan and is known for an inland drainage pattern. It does not join the Ganga or Brahmaputra and does not rise in the Himalayas. Instead, it rises in the Aravalli region and flows through a dry landscape where low rainfall, high evaporation, and porous sandy surfaces reduce its water. It eventually spreads toward or disappears in the Rann of Kachchh rather than reaching the sea through a permanent river mouth. Therefore, option B is correct. The key geographical concept is inland drainage: the river’s flow terminates within a low-lying arid area instead of joining a major external drainage system.

The Krishna River rises near Mahabaleshwar in the Western Ghats of Maharashtra, so option A is correct. More precisely, its headwaters are traditionally associated with the Mahabaleshwar region, from where the river flows generally eastward across the Deccan Plateau before reaching the Bay of Bengal. Trimbakeshwar is linked with the origin of the Godavari, Amarkantak with rivers such as the Narmada and Son, and Talakaveri with the Kaveri. The governing concept is the identification of major Indian rivers by their source regions; remembering Krishna–Mahabaleshwar prevents confusion among peninsular river origins.

The correct answer is Trimbakeshwar, located near Nashik in Maharashtra. The Godavari rises in the Brahmagiri hills near Trimbakeshwar and then flows eastward across the Deccan Plateau to the Bay of Bengal. It is often called the ‘Dakshin Ganga’ or Southern Ganga because of its great length and importance in peninsular India. Talakaveri is the source of the Kaveri, Mahabaleshwar is associated with the Krishna, and Sasaram is not the accepted source location of the Godavari. The governing concept is matching a major river with its source, so the Godavari–Trimbakeshwar association makes option B correct.

The correct answer is Wular Lake. The Jhelum is an important river of the Kashmir Valley, and its course is connected with Wular, one of the largest freshwater lakes in India. Wular lies in Jammu and Kashmir and acts as an important natural flood-absorption basin for the valley. Sambhar is a saline lake in Rajasthan, Loktak is a freshwater lake in Manipur known for floating phumdis, and Kolleru is a freshwater lake between the Krishna and Godavari deltas in Andhra Pradesh. The governing concept is the relationship between Indian rivers and lakes; the Jhelum–Wular pairing makes option A correct.

The correct answer is the Jhelum River. In ancient Indian texts, the Jhelum was known as Vitasta, and in Greek accounts it was called Hydaspes. It rises in the Kashmir region and is one of the major rivers of the Indus river system. The Chenab, Ravi and Sutlej are also important Indus-system rivers, but they have different historical names: Chenab was associated with Asikni, Ravi with Iravati and Sutlej with Shatadru. The governing concept is the identification of ancient names of present-day rivers. Since Vitasta is the historical name specifically connected with the Jhelum, option B is the only correct answer.

The correct answer is the Ganga river system. A drainage system includes a main river, its tributaries and the land area from which water flows into them. The Ganga system covers a vast and densely populated part of northern India and includes major tributaries such as the Yamuna, Ghaghara, Gandak and Kosi. The Krishna, Narmada and Kaveri systems are important peninsular systems, but their drainage areas are considerably smaller. The question uses ‘largest drainage system,’ which refers to the overall network and basin rather than the length of only one channel. On that basis, the Ganga system is the appropriate answer, making option C correct.

The correct answer is Mahi. The Chambal is an important tributary of the Yamuna, and its well-known tributaries include the Banas, Kali Sindh and Parvati. Mahi is not part of the Chambal drainage network. It is a separate west-flowing peninsular river that rises in the Vindhyan region and ultimately enters the Gulf of Khambhat in Gujarat. Therefore, option C is correct. The question tests the distinction between tributaries belonging to the same drainage basin, not merely rivers found in central or western India. Banas, Kali Sindh and Parvati are associated with the Chambal system, whereas Mahi follows an independent course.

The correct answer is Son. When a river is viewed in the direction of its flow, a tributary joining from the south is called a right-bank tributary. The Son flows generally eastward from central India and joins the Ganga from the south, making it a major right-bank tributary. Ghaghara, Gandak and Kosi descend from the Himalayan region and join the Ganga from the north, so they are generally classified as left-bank tributaries. Therefore, option D is correct. The governing idea is not simply the position on a map; bank classification is determined while facing downstream. This directional rule explains why Son is the correct choice even though all four rivers are important Ganga tributaries.

The correct answer is Pangong Tso. It is a large, high-altitude endorheic lake in the Ladakh region and contains saline water, although the salinity can vary in different parts of the lake. Because it has no ordinary outlet to the sea, dissolved minerals accumulate in its basin. Dal Lake, Bhimtal and Nainital are important Himalayan lakes, but they are freshwater lakes associated with different local drainage and tourism settings. Thus option A is the only choice that satisfies both clues: high altitude and saline character. The governing concept is the classification of lakes by altitude, water chemistry and drainage. Remembering Pangong Tso as a saline Himalayan border-region lake helps distinguish it from the freshwater lakes of Kashmir and Uttarakhand.

The correct answer is Brahmaputra. After flowing through Tibet as the Yarlung Tsangpo, the river enters Arunachal Pradesh and is known locally as the Siang or Dihang. Farther downstream, after receiving important tributaries such as the Dibang and Lohit, it is widely known as the Brahmaputra in Assam. Therefore, option A is correct. Teesta is an eastern Himalayan river associated mainly with Sikkim and West Bengal, while Subansiri and Manas are tributaries of the Brahmaputra system rather than alternative names for the main river. The governing concept is the change of a river’s regional name along its course. The sequence Tibet—Yarlung Tsangpo, Arunachal Pradesh—Siang or Dihang, Assam—Brahmaputra is especially useful for examinations.

The correct answer is the Brahmaputra system. The Teesta rises in the eastern Himalaya, flows through Sikkim and West Bengal, and then continues into Bangladesh, where it joins the Brahmaputra, known there as the Jamuna. Its geographical setting and downstream connection therefore place it within the Brahmaputra drainage system. Option B is correct. The Indus system lies mainly to the northwest, while Narmada and Krishna are peninsular Indian systems flowing in entirely different regions. The question tests drainage-basin relationships rather than only the state through which a river passes. Although Teesta is often discussed as a Sikkim or eastern Himalayan river, its larger river-system association is with the Brahmaputra.

The correct answer is the Sutlej-Beas system. The Indira Gandhi Canal carries water from the Harike Barrage in Punjab toward the arid and semi-arid regions of northwestern Rajasthan. Harike is formed at the confluence of the Sutlej and Beas rivers, so the canal receives water from that combined river system. It supports irrigation, drinking-water supply, and settlement in areas that naturally receive very little rainfall. The Ganga, Godavari, and Narmada systems are major Indian drainage systems, but none is the principal source associated with this canal project. The project is therefore a classic example of canal-based desert irrigation.

The correct answer is the Ganga system. Sarayu is commonly associated with the Ghaghara River system, and the Ghaghara is an important tributary of the Ganga. In geographical and cultural usage, the river flowing by Ayodhya is called Sarayu, while the broader drainage connection is explained through Ghaghara and then the Ganga. The Indus system lies mainly to the northwest, whereas Krishna drains the Deccan peninsula and Narmada flows westward into the Arabian Sea. Thus, even though local naming and river-channel terminology can vary, the major drainage classification places Sarayu within the Ganga basin.

The correct answer is the Ganga. The Hooghly is a distributary of the Ganga that flows through West Bengal and reaches the Bay of Bengal. A distributary branches away from the main river in its lower course, usually toward a delta or estuary, whereas a tributary joins the main river. This distinction is important: the Hooghly is not a tributary of the Brahmaputra, Mahanadi, or Godavari. The Bhagirathi-Hooghly channel is an important branch of the Ganga system and has supported ports, settlements, agriculture, and commerce in the region. Therefore, option A correctly identifies its parent river.

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.