BPSC CCE Prelims
Drainage System and Rivers Previous Year Questions (PYQs)
Practice solved questions for Drainage System and Rivers with detailed step-by-step solutions, key insights, and trend analysis for BPSC CCE PRELIMS.
Solved Previous Year Questions
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Which is the largest river Island in the world?
Detailed Explanation:
Majuli Island is the largest river island in the world, located in the Brahmaputra River in Assam, India.
It covers approximately 880 sq km (reduced due to erosion), was declared a district in 2016, and is renowned for its Vaishnavite Satras (monastic institutions). Srirangam is a smaller river island in Kaveri River, Bhavani Island is in Krishna River (Vijayawada), and Agatti is a coral atoll in Lakshadweep, not a river island.
The second largest river basin of India is -
Detailed Explanation:
Ganga basin is the largest river basin in India, covering approximately 8.6 lakh sq km.
Godavari basin is the second largest, with an area of approximately 3.12 lakh sq km, followed by Krishna basin (2.59 lakh sq km), Mahanadi basin (1.4 lakh sq km), and smaller basins like Narmada and Kaveri.
Which of the following is the place of confluence of the Alaknanda and Bhagirathi?
Detailed Explanation:
Devprayag is the confluence of the Alaknanda and Bhagirathi rivers in Uttarakhand, where the combined stream is officially named the Ganga.
The other prayags involve only the Alaknanda: Vishnuprayag (Alaknanda + Dhauliganga), Karnaprayag (Alaknanda + Pindar), Rudraprayag (Alaknanda + Mandakini), and Nandprayag (Alaknanda + Nandakini).
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Which pair of rivers cuts the Tropic of Cancer twice over Chhota Nagpur Plateau ?
Detailed Explanation:
The Tropic of Cancer (23°30'N) passes through the Chhota Nagpur Plateau in Jharkhand.
The North Koel River originates on the Ranchi Plateau, flows northward through Palamu, crosses the Tropic of Cancer twice due to its meandering course, and joins the Son River.
The Suwarnarekha River originates near Piska (west of Ranchi), flows eastward through Jharkhand, West Bengal, and Odisha, crosses the Tropic of Cancer twice over the plateau, and drains into the Bay of Bengal.
The Damodar and South Koel do not exhibit this double-crossing pattern over the plateau.
Amarkantak source place of Son river is situated at
Detailed Explanation:
Amarkantak plateau is located in the Maikal range, which is an eastern extension of the Satpura range in Madhya Pradesh.
It serves as the source of the Son River, Narmada River, and Johila River, making it a significant hydrological divide in central India.
According to the Indus Waters Treaty, the three eastern rivers are allocated to India. Which of the following is not one of them?
Detailed Explanation:
Indus Waters Treaty (1960) allocated three eastern rivers to India: Ravi, Beas, Sutlej.
Three western rivers to Pakistan: Indus, Jhelum, Chenab.
Jhelum is a western river, not an eastern river allocated to India.
Which one of the following rivers is different from the others?
Detailed Explanation:
Narmada is a west-flowing river draining into the Arabian Sea.
Tungabhadra (tributary of Krishna), Penganga (tributary of Godavari), and Mahanadi are all east-flowing rivers draining into the Bay of Bengal.
Compare the Himalayan river with the Peninsular river based on the following comparisons :
- Most of the Himalayan rivers are perennial, whereas most of the Peninsular rivers are rain sed.
- The gradient of the Himalayan river is steeper than the Peninsular river.
- The Peninsular river causes more erosion on its way in comparison to the Himalayan river,
Choose the correct answer from the options given below,
Detailed Explanation:
Himalayan rivers are perennial (fed by glaciers and monsoons), while Peninsular rivers are mostly rain-fed (seasonal flow). Himalayan rivers originate from steep slopes (3,000–5,000 m), creating a steeper gradient than Peninsular rivers flowing over gentler plateaus.
Statement 3 is Incorrect: Steeper gradients and higher velocity enable Himalayan rivers to cause more erosion (deep gorges, V-shaped valleys) compared to Peninsular rivers with gentler slopes and slower flow.
Therefore, only statements 1 and 2 are correct, making Option 1 the correct answer.
The confluence of the rivers Son and Ganga is located in which district of Bihar?
Detailed Explanation:
The Son River confluences with the Ganga River near Digha Ghat in Patna district, Bihar. This confluence site is historically and geographically significant.
Buxar, Bhojpur, and Nalanda districts do not host this specific river confluence point.
Therefore, the Son-Ganga confluence is in Patna, making Option 2 the correct answer.
The rivers Damodar, Koel and Subarnarekha originate from which of the following?
Detailed Explanation:
The Damodar, Koel, and Subarnarekha rivers originate from the Chota Nagpur Plateau in eastern India, covering parts of Jharkhand, Odisha, West Bengal, and Chhattisgarh. This ancient plateau is a major watershed for several east-flowing rivers.
The Deccan Plateau is in peninsular India (south of Narmada), the Central Highland lies between Aravalli and Vindhya ranges, and the Meghalaya Plateau is in the northeast—none are the source of these three rivers.
Therefore, Chota Nagpur Plateau being the origin, Option 3 is the correct answer.
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