Q1. What defines an antecedent river in the classification of drainage systems?
Major Rivers and Lakes of the World: RAS Prelims MCQs
80 RAS Prelims MCQs on the major rivers and lakes of the world cover the longest rivers, tributaries, deltas, lake basins and river features. The Amazon and its tributaries, the Congo at the Equator, the Volga and the Caspian, the Mississippi delta and the Aral Sea are tested, and the explanations link each river to its basin and mouth.
Practice questions based on the RPSC RAS Prelims syllabus. They follow the exam pattern but are not past-paper questions.
Showing 1–10 of 80 questions
Q2. Which of the following is a major left-bank tributary of the Amazon River?
Explanation
The Amazon River system features numerous significant tributaries classified by their bank position. The Rio Negro is the largest left-bank tributary, originating in Colombia and joining the Amazon near Manaus. Other major rivers like the Madeira, Purus, and Tapajos are right-bank tributaries, flowing from the south. The Rio Negro is known for its distinctive dark-colored waters.
Q3. Identify the incorrect statement regarding the Nile River basin.
Explanation
The Nile River system is primarily formed by the convergence of the White Nile and the Blue Nile at Khartoum. The Blue Nile originates from Lake Tana in the Ethiopian Highlands. This massive drainage basin spans several nations, including Egypt and Sudan. Ultimately, the river flows northward and discharges its waters into the Mediterranean Sea, not the Red Sea.
Q4. Which of the following major global rivers is famous for crossing the Equator twice during its course?
Explanation
The Congo River, formerly known as the Zaire River, is the only major river on Earth that crosses the Equator twice during its journey. It flows through the dense equatorial rainforests of Central Africa. This unique geographical path results in a relatively consistent water volume throughout the year, as different parts of the basin experience seasonal rains at different times.
Q5. Match List-I (River) with List-II (Region/ Continent) and select the correct answer using the options below:
| River | Region/Continent |
|---|---|
| A. Lena | i. Europe |
| B. Thames | ii. North America |
| C. Yangtze | iii. Siberia |
| D. Mississippi | iv. China |
Explanation
Major global river systems are distributed across different continents according to regional geography. The Lena River flows through the Siberian region of Russia. The Thames is a vital waterway located in Europe, specifically the United Kingdom. The Yangtze is the longest river in Asia, situated in China. The Mississippi River serves as a primary drainage system within North America.
Q6. What is the primary cause of the drastic shrinking of the Aral Sea over the past few decades?
Explanation
The drastic shrinking of the Aral Sea is primarily attributed to large-scale human intervention. Starting in the mid-twentieth century, the two main feeder rivers, the Amu Darya and Syr Darya, were diverted for massive agricultural irrigation projects, particularly cotton farming. This reduction in freshwater inflow, combined with high evaporation in the arid climate, caused the lake to dry up rapidly.
Q7. Oxbow lakes are a characteristic feature of which specific stage or region of a river’s course?
Explanation
Oxbow lakes are distinctive U-shaped bodies of water formed when a wide meander from the main course of a river is cut off. This process typically occurs in the lower course or old stage of a river, where the gradient is low and lateral erosion is dominant. Over time, the river breaches the narrow neck of a meander loop.
Q8. Consider the following statements regarding the Yangtze and Huang He rivers:
I. The Yangtze is the longest river in Asia.
II. The Huang He is known as the "Sorrow of China" due to its frequent devastating floods.
III. Both rivers discharge their waters into the Indian Ocean.
Which of the above statement(s) is/are correct?
I. The Yangtze is the longest river in Asia.
II. The Huang He is known as the "Sorrow of China" due to its frequent devastating floods.
III. Both rivers discharge their waters into the Indian Ocean.
Which of the above statement(s) is/are correct?
Explanation
The Yangtze River holds the record as the longest river in Asia and flows entirely within China. The Huang He, or Yellow River, is often called the "Sorrow of China" due to its history of catastrophic floods. Both rivers eventually discharge into the Pacific Ocean via the East China Sea and Bohai Sea respectively, rather than the Indian Ocean.
Q9. The Volga River, which is the longest river in Europe, ultimately drains into which of the following water bodies?
Explanation
The Volga River is recognized as the longest river in Europe and flows entirely through Russia. It is a vital waterway for transportation and irrigation within the country. After traversing a significant portion of European Russia, it ultimately drains into the Caspian Sea, which is an endorheic basin with no outlet to the world’s oceans.
Q10. The following question consists of two statements -- Assertion (A) and Reason (R). Answer the question by selecting the appropriate option:
Assertion (A): Many of the African Great Lakes, such as Lake Tanganyika and Lake Malawi, are exceptionally deep and long.
Reason (R): These lakes were formed by the accumulation of water in the deep trenches created by the East African Rift System.
Choose the correct option:
Assertion (A): Many of the African Great Lakes, such as Lake Tanganyika and Lake Malawi, are exceptionally deep and long.
Reason (R): These lakes were formed by the accumulation of water in the deep trenches created by the East African Rift System.
Choose the correct option:
Explanation
Several major African lakes, including Lake Tanganyika and Lake Malawi, are characterized by their extreme depth and elongated shapes. These physical features are a direct result of their geological origin within the East African Rift System. As the continental crust pulls apart, deep tectonic trenches are created, which then fill with water to form these significant rift valley lakes.Answer key for these questions
| Q | Correct answer |
|---|---|
| 1 | (b) A river that maintains its original course and pattern despite localized tectonic uplift |
| 2 | (a) Rio Negro |
| 3 | (c) The Nile River drains directly into the Red Sea. |
| 4 | (d) Congo River |
| 5 | (c) A-iii, B-i, C-iv, D-ii |
| 6 | (b) River diversion for large-scale agricultural irrigation |
| 7 | (d) The lower course where lateral erosion and meandering dominate |
| 8 | (a) I and II only |
| 9 | (c) Caspian Sea |
| 10 | (a) Both A and R are true and R is the correct explanation of A. |
Key facts from Major Rivers and Lakes of the World
- By the usual measurements the longest rivers run in the order Nile, Amazon, Yangtze, Mississippi-Missouri.
- The Rio Negro is a major left-bank tributary of the Amazon.
- The Congo River crosses the Equator twice.
- The Volga, the longest river of Europe, drains into the Caspian Sea; the Thames passes through London.
- The Mississippi forms a bird’s-foot delta; the Huang He carries yellow silt from the Loess Plateau.
- The Aral Sea has shrunk mainly because rivers were diverted for large-scale irrigation; Lake Tanganyika is the second deepest lake in the world.
Frequently asked questions
How many RAS Prelims practice MCQs are there on Major Rivers and Lakes of the World?
This page has 80 practice MCQs on Major Rivers and Lakes of the World (World Geography). Each has the correct answer, and most have an explanation.
Which river crosses the Equator twice?
The Congo River in Africa. It flows through both hemispheres, which gives its basin rainfall in all seasons and makes it a river with a very steady flow.
Why has the Aral Sea shrunk?
Because the rivers that fed it, the Amu Darya and Syr Darya, were diverted for large-scale irrigation of cotton and other crops. With little inflow, the lake lost most of its area and became a major environmental disaster.
Where does the Volga drain?
Into the Caspian Sea. The Volga is the longest river in Europe, and because the Caspian is an inland sea, the river is an example of inland drainage.