Q141. Which of the following is the most appropriate description of a "subsequent river"?
World Geography: RAS Prelims MCQs
553 RAS Prelims practice MCQs on world geography are on this page, in 7 chapters. They cover physical landforms, major rivers and lakes, natural vegetation and biomes, world agriculture, industrial regions, the transport network and the main environmental issues: desertification, deforestation, climate change and ozone depletion. Each question has an answer and an explanation, in the formats the exam uses.
Practice questions based on the RPSC RAS Prelims syllabus. They follow the exam pattern but are not past-paper questions.
Showing 141–150 of 553 questions
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Q142. Select the correct order of the Great Lakes of North America from largest to smallest based strictly on their surface area:
Explanation
The North American Great Lakes vary significantly in size. When ranked by surface area from largest to smallest, the sequence begins with Lake Superior, followed by Lake Huron and Lake Michigan. Lake Erie is the second smallest, and Lake Ontario is the smallest of the five. Together, these interconnected lakes constitute the largest group of freshwater lakes on Earth.
Q143. Identify the correct statement regarding the Thames River.
Explanation
The Thames River is the primary waterway of southern England. It originates in the Cotswold Hills and flows eastward through major towns and the capital city, London. Eventually, the river broadens into the Thames Estuary and discharges its waters into the North Sea. It is a vital historical and modern route for navigation and urban development within the region.
Q144. A drainage pattern where the rivers directly reflect and follow the initial geological slope of a newly formed landscape is classified as:
Explanation
Drainage patterns are classified according to how they relate to the landscape’s topography and geological structure. A system where the rivers flow in direct response to the initial slope and tilt of a newly formed land surface is known as consequent drainage. This is often seen on coastal plains or newly uplifted mountain slopes where the water follows the simplest path.
Q145. Match List-I (River System) with List-II (Associated Nation/Continent) and select the correct option:
| River System | Associated Nation/Continent |
|---|---|
| A. Ob-Irtysh | i. North America |
| B. Mississippi-Missouri | ii. Central Africa |
| C. Huang He | iii. China |
| D. Congo | iv. Russia |
Explanation
Major river systems are globally distributed across different continents. The Ob-Irtysh system is a major drainage network in Russia. The Mississippi-Missouri system covers a vast area of North America. The Huang He is a critical river in China. The Congo River flows through the heart of Central Africa. These systems are essential for the water security of their respective regions.
Q146. Lake Superior is recognized globally as:
Explanation
Lake Superior, located on the border between the United States and Canada, holds a prominent place in global geography. It is officially recognized as the world’s largest freshwater lake when measured by surface area. Its vast size influences regional weather patterns, including lake-effect snow, and it serves as a critical component of the Great Lakes-St. Lawrence Seaway system.
Q147. The Congo River does not possess a true delta at its mouth. What is the primary cause for this geographical phenomenon?
Explanation
Unlike many major rivers, the Congo River does not form a traditional delta at its mouth. This is primarily because of the unique underwater topography and powerful currents at its discharge point into the Atlantic Ocean. A deep submarine canyon extends from the river’s mouth, allowing sediment to be carried far out into the deep sea rather than accumulating near the shore.
Q148. Consider the following statements regarding the environmental disaster of the Aral Sea:
I. Before shrinking, it was considered one of the four largest lakes in the world.
II. The retreating water left behind toxic salt and dust plains that cause severe local health issues.
III. The primary cause was intensive water diversion during the Soviet era to grow cotton.
Which of the above statement(s) is/are correct?
I. Before shrinking, it was considered one of the four largest lakes in the world.
II. The retreating water left behind toxic salt and dust plains that cause severe local health issues.
III. The primary cause was intensive water diversion during the Soviet era to grow cotton.
Which of the above statement(s) is/are correct?
Explanation
The Aral Sea once ranked among the four largest lakes globally, but it has undergone a catastrophic decline. The primary cause was the massive diversion of its feeder rivers for cotton irrigation. As the water receded, it exposed vast plains of toxic salt and dust, which are blown across the region by winds, causing severe local health problems.
Q149. Which of the following pairs concerning the classification of lakes is incorrectly matched?
Explanation
Lakes are classified by their mode of origin. Lake Tanganyika is a tectonic rift lake, while Lake Huron was formed by glacial processes. Crater Lake is a classic volcanic caldera lake. However, the Caspian Sea is not an oxbow lake; it is a massive tectonic basin and a remnant of the ancient Paratethys Sea, far exceeding the scale of oxbows.
Q150. The following question consists of two statements -- Assertion (A) and Reason (R). Answer the question by selecting the appropriate option:
Assertion (A): The Indus and Brahmaputra rivers have carved remarkably deep gorges into the Himalayas.
Reason (R): Both are antecedent rivers that continued to cut downward at a rate matching the tectonic uplift of the Himalayan mountains.
Choose the correct option:
Assertion (A): The Indus and Brahmaputra rivers have carved remarkably deep gorges into the Himalayas.
Reason (R): Both are antecedent rivers that continued to cut downward at a rate matching the tectonic uplift of the Himalayan mountains.
Choose the correct option:
Explanation
The Indus and Brahmaputra rivers are famous for the deep, spectacular gorges they have carved through the Himalayan mountains. These rivers are classified as antecedent drainage systems because they existed before the mountains were formed. As the Himalayas rose due to tectonic forces, the rivers maintained their courses by eroding downward at a rate that matched the mountain-building process.Answer key for these questions
| Q | Correct answer |
|---|---|
| 141 | (c) A tributary eroding along a band of weak rock |
| 142 | (a) Superior, Huron, Michigan, Erie, Ontario |
| 143 | (a) It flows through southern England into the North Sea |
| 144 | (b) Consequent drainage |
| 145 | (b) A-iv, B-i, C-iii, D-ii |
| 146 | (a) The largest freshwater lake by surface area |
| 147 | (c) Deep trenches and fast currents carrying sediment to the sea |
| 148 | (d) I, II, and III |
| 149 | (c) Oxbow Lake - Caspian Sea |
| 150 | (a) Both A and R are true and R is the correct explanation of A. |
Key facts from World Geography
- The RPSC syllabus for world geography lists mountains, plateaus, plains and deserts, major rivers and lakes, natural vegetation, agriculture, industrial regions, transport and environmental issues.
- Questions ask for the location of a feature: where a range lies, where a river ends, which country has an industrial region.
- Statement and sequence questions are common, for example the order of mountain ranges or of vegetation layers.
- Environmental issues are asked through treaties and dates, such as the Montreal Protocol, the IPCC and the Paris Agreement.
- Indian and Rajasthan geography are on their own pages, each with its own chapters.
Frequently asked questions
How many RAS Prelims practice MCQs are there on World Geography?
This page has 553 practice MCQs on World Geography. Each has the correct answer, and most have an explanation.
Which chapters does the world geography set cover?
Seven chapters: physical landforms (mountains, plateaus, plains and deserts), major rivers and lakes, natural vegetation and biomes, world agriculture, major industrial regions, the world transport network, and environmental issues including desertification, deforestation, climate change and ozone depletion.
Is world geography part of the RAS Prelims syllabus?
Yes. The RPSC syllabus has a Geography of World and India section that lists physical aspects, rivers and lakes, natural vegetation, agriculture, industrial regions, transport and environmental issues for the world, followed by India and Rajasthan.
How can I revise world geography quickly?
Use an atlas alongside the questions. Attempt each chapter, read the explanation for every miss and mark the place on the map. Make short lists of ranges, rivers and industrial regions with their countries, and revise them over several days.