9,654 RAS Prelims practice MCQs with the correct answer and a clear explanation for each. Filter by subject and chapter.
Practice questions based on the RPSC RAS Prelims syllabus. They follow the exam pattern but are not past-paper questions.
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RAS PrelimsRajasthan Geography · Minerals of Rajasthan: Metallic and Non-Metallic
Q9401. Consider the following statements about the challenges faced by the mining sector in Rajasthan: I. Depletion of high-grade ores forces industries to rely on complex beneficiation of low-grade ores. II. Strict environmental regulations often require mining projects to undergo rigorous clearance processes. III. Unregulated and illegal mining leads to significant losses to the state exchequer. IV. The mining sector faces absolutely no resistance or issues regarding land acquisition from local communities. Which of the above statement(s) is/are incorrect?
Explanation
Depletion of high-grade ores, strict environmental clearances and illegal mining losses are real problems of the mining sector. There is resistance over land acquisition from local communities, so IV is incorrect.
RAS PrelimsRajasthan Geography · Minerals of Rajasthan: Metallic and Non-Metallic
Q9402. Identify the correctly matched pair of the mineral and its exclusive major deposit in Rajasthan:
Explanation
Degana in Nagaur is the most famous and historically significant site for tungsten in India. Lead-zinc is primarily found in Zawar and Rampura-Agucha, not Makrana. Copper is famously extracted from Khetri, not Jhamarkotra, which is a rock phosphate site. Iron ore is found in areas like Morija-Banol, whereas Sanu in Jaisalmer is renowned for high-grade limestone, making other pairings incorrect.
RAS PrelimsRajasthan Geography · Minerals of Rajasthan: Metallic and Non-Metallic
Q9403. Which of the following statements concerning Makrana Marble is correct?
Explanation
Makrana marble is a high-quality white metamorphic rock that was the first stone from Asia to receive the Global Heritage Stone Resource designation. This status recognizes its international historical, architectural, and cultural importance. The marble remains an active resource and is pried for premium construction, sculptures, and preserving iconic monuments like the Taj Mahal rather than for industrial fertilizer use.
RAS PrelimsRajasthan Geography · Minerals of Rajasthan: Metallic and Non-Metallic
Q9404. Consider the following prominent structural regions associated with Lead and Zinc mineralization in Rajasthan and arrange them from North to South: I. Rampura-Agucha II. Rajpura-Dariba III. Zawar Which of the following represents the correct sequence?
Explanation
The major lead-zinc deposits of Rajasthan follow a North to South geographical distribution. Rampura-Agucha in the Bhilwara district is the northernmost of the three. Moving south, Rajpura-Dariba is located in the Rajsamand district. The Zawar mines in the Udaipur district represent the southernmost point in this sequence. This alignment reflects the structural trend of the mineralized belts within the state.
RAS PrelimsRajasthan Geography · Minerals of Rajasthan: Metallic and Non-Metallic
Q9405. The large-scale extraction of Rock Phosphate from the Udaipur and Jaisalmer regions is most appropriately justified by the national necessity to produce which essential commodity?
Explanation
Rock phosphate is an essential mineral used primarily for the production of phosphatic fertilizers like Single Super Phosphate (SSP) and Diammonium Phosphate (DAP). Given India’s large agricultural sector, the extraction of rock phosphate from Udaipur and Jaisalmer is a national priority. These deposits provide the necessary phosphorus content required to improve soil fertility and enhance crop yields across the country.
RAS PrelimsRajasthan Geography · Minerals of Rajasthan: Metallic and Non-Metallic
Q9406. Which of the following statements accurately recalls the nature of Rock Phosphate deposits found in the Jaisalmer district?
Explanation
The rock phosphate deposits found in the Jaisalmer district, particularly in the Birmania area, are characterized as low-grade sedimentary formations. Unlike the high-grade crystalline deposits found in some other regions, these occur as phosphatic nodules and layers within sedimentary rock sequences. While they are less commercially valuable than the Jhamarkotra deposits, they still represent a significant part of the state’s inventory.
RAS PrelimsRajasthan Geography · Minerals of Rajasthan: Metallic and Non-Metallic
Q9407. The application of Gypsum in agriculture relies fundamentally on which of the following chemical concepts?
Explanation
Gypsum is used in agriculture to treat "usar" or alkaline soils. Chemically, it provides calcium ions that replace excess sodium ions on the soil particles. This replacement improves the physical structure of the soil, making it more porous and allowing for better water percolation and root growth. This fundamental chemical process is vital for reclaiming unproductive lands in arid regions.
RAS PrelimsRajasthan Geography · Minerals of Rajasthan: Metallic and Non-Metallic
Q9408. Read the given statements and select the correct answer from the options provided: Given below are two statements, one labelled as Assertion (A) and the other labelled as Reason (R): Assertion (A): Beneficiation plants for Rock Phosphate have been established at Jhamarkotra in Udaipur. Reason (R): The locally extracted rock phosphate ore contains high levels of silica and dolomite impurities that must be removed to upgrade it for fertilizer grade.
Explanation
Beneficiation plants are essential at Jhamarkotra because the raw rock phosphate ore often contains high levels of silica and dolomite. These impurities must be removed to produce a high-grade concentrate suitable for fertilizer manufacturing. By processing the low-grade ore locally, the industry ensures the efficient utilization of the resource and improves the economic viability of the operations in Udaipur.
RAS PrelimsRajasthan Geography · Minerals of Rajasthan: Metallic and Non-Metallic
Q9409. Which of the following statements regarding silver mining in Rajasthan is incorrect?
Explanation
Rajasthan does not have any independent, large-scale pure silver mines. All significant silver production in the state is derived as a by-product during the smelting of lead and zinc ores from mines like Zawar and Rajpura-Dariba. While the state is the top silver producer in India, this production is entirely linked to the processing of polymetallic base metal ores.
RAS PrelimsRajasthan Geography · Minerals of Rajasthan: Metallic and Non-Metallic
Q9410. Match the items in List I with those in List II and select the correct answer using the options provided:
Famous Mining Area
Corresponding Mineral
A. Jhamarkotra
i. Marble
B. Makrana
ii. Copper
C. Rampura-Agucha
iii. Rock Phosphate
D. Khetri
iv. Zinc
Explanation
Jhamarkotra is the leading site for rock phosphate. Makrana is synonymous with high-quality white marble. Rampura-Agucha is a world-class source for zinc and lead. Khetri is the heart of copper mining in Rajasthan. These associations are fundamental to understanding the state’s economic geography, as each location is a primary national center for its respective mineral, contributing to growth.
Answer key for these questions
Q
Correct answer
9401
(c) IV only
9402
(d) Tungsten -- Degana (Nagaur)
9403
(a) It was the first stone resource in Asia designated as a Global Heritage Stone Resource by IUGS
9404
(a) I, II, III
9405
(a) Phosphatic Fertilizers like SSP and DAP
9406
(d) They are low-grade, sedimentary phosphatic nodules occurring primarily in the Birmania area
9407
(b) Its capacity to replace sodium ions with calcium ions, improving soil structure and percolation
9408
(a) Both A and R are true and R is the correct explanation of A.
9409
(d) Rajasthan possesses independent, extremely large pure silver mines in the Thar desert
9410
(a) A-iii, B-i, C-iv, D-ii
Frequently asked questions
How many RAS Prelims practice MCQs are there on RAS Prelims?
This page has 9654 practice MCQs on the RAS Prelims syllabus. Each has the correct answer, and most have an explanation.
How should I practise MCQs for RAS Prelims?
Attempt each question first, then open the answer and read the explanation. Practise one chapter at a time, note the facts you got wrong and revise them. Repeat the chapter after a few days.
Are these actual RAS Prelims past-paper questions?
No. These are practice questions written for the RAS Prelims syllabus. They follow the pattern the exam uses: factual questions, statement-based questions, match-the-list and assertion-reason.
