Q581. The presence of copper mirrors in the graves of Kalibangan most strongly points to an understanding and application of:
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Q582. A solution turns blue litmus paper red. Its pH is most likely to be:
Explanation
Litmus paper is a common acid-base indicator used to test the chemical nature of a solution. When blue litmus paper turns red, it indicates that the substance is acidic. On the pH scale, which ranges from zero to fourteen, acidic solutions have values less than seven. Therefore, a pH of three clearly represents an acidic environment capable of producing this specific color change.
Q583. Geographically, the highest concentration of surveyed Palaeolithic and Mesolithic sites in western Rajasthan is found in the basin of which river?
Explanation
Geographically, the Luni river basin in western Rajasthan contains the highest concentration of surveyed Palaeolithic and Mesolithic sites. The river and its tributaries provided a critical lifeline in an otherwise semi-arid environment, offering water and attracting game for ancient hunter-gatherers. The abundance of lithic tools found along the riverbanks demonstrates that this region was a major hub of human activity throughout antiquity.
Q584. A strong acid is characterized by its ability to:
Explanation
A strong acid is defined by its ability to undergo complete ionization or dissociation when dissolved in water. This means that almost every acid molecule breaks apart to release hydrogen ions into the solution. In contrast, weak acids only partially dissociate, with most molecules remaining intact. Common examples of strong acids include hydrochloric acid and sulfuric acid, which are highly reactive and conduct electricity.
Q585. Match List-I with List-II regarding the geographical regions of Rajasthan and their associated major prehistoric/protohistoric sites:
| Geographical Region of Rajasthan | Associated Prehistoric/Protohistoric Site |
|---|---|
| A. Mewar region | i. Kalibangan |
| B. Shekhawati region | ii. Didwana |
| C. Ghaggar region | iii. Ganeshwar |
| D. Marwar region | iv. Ahar |
Explanation
Rajasthan’s prehistoric sites are spread across various geographical regions. The Mewar region is home to the Ahar culture, while the Shekhawati region contains the copper-rich site of Ganeshwar. The Ghaggar region in the north is where the famous Harappan site of Kalibangan is located. Finally, the Marwar region, particularly the area around Didwana, is renowned for its extensive Palaeolithic sequences.
Q586. The reaction between an acid and a base to produce salt and water is known as:
Explanation
Neutralization is a chemical reaction in which an acid and a base react quantitatively with each other to produce a salt and water. During this process, the hydrogen ions from the acid combine with the hydroxide ions from the base to form neutral water molecules. The resulting solution is typically closer to neutral pH, provided the reactants are balanced in their respective strengths.
Q587. Identify the incorrect statement regarding the geographical spread of prehistoric sites in Rajasthan.
Explanation
While the Thar desert is currently a harsh environment, the claim that it has zero evidence of prehistoric humans is entirely false. Archaeological research has uncovered numerous sites within the desert core that were inhabited during wetter climatic phases. From the Lower Palaeolithic tools of Didwana to Mesolithic microlith clusters, the Thar has yielded significant evidence of human adaptation over time.
Q588. Milk of magnesia, commonly used as an antacid, is chemically:
Explanation
Milk of magnesia is a common medicinal suspension used to treat indigestion and heartburn. Chemically, it is known as magnesium hydroxide. As a mild base, it works by reacting with the excess hydrochloric acid in the stomach through a neutralization reaction. This process reduces the overall acidity in the digestive tract, providing relief from the discomfort and irritation caused by acid reflux.
Q589. Consider the following statements mapping cultures to the geography of Rajasthan:
I. Banas basin is famously associated with Chalcolithic agrarian cultures.
II. Kantli river basin is associated with prominent copper-producing sites.
III. Ghaggar valley contains crucial Pre- Harappan and Harappan urban sites.
IV. Luni basin shows rich evidence of Middle Palaeolithic tool industries.
V. The Chambal valley is completely devoid of any painted rock shelters.
Which of the above statement(s) is/are correct?
I. Banas basin is famously associated with Chalcolithic agrarian cultures.
II. Kantli river basin is associated with prominent copper-producing sites.
III. Ghaggar valley contains crucial Pre- Harappan and Harappan urban sites.
IV. Luni basin shows rich evidence of Middle Palaeolithic tool industries.
V. The Chambal valley is completely devoid of any painted rock shelters.
Which of the above statement(s) is/are correct?
Explanation
Rajasthan’s geography influenced its cultural landscape significantly. The Banas basin supported Chalcolithic farmers, while the Kantli basin was a hub for copper production. The Ghaggar valley hosted urban Harappan sites, and the Luni basin is rich in Middle Palaeolithic remains. However, the claim that the Chambal valley lacks painted rock shelters is incorrect, as the region is famous for rock art.
Q590. Consider the following common salts and their chemical names:
I. Baking soda - Sodium bicarbonate
II. Washing soda - Sodium carbonate decahydrate
III. Plaster of Paris - Calcium sulfate hemihydrate
IV. Bleaching powder - Calcium oxychloride
V. Table salt - Potassium chloride
Which of the above pair(s) is/are incorrectly matched?
I. Baking soda - Sodium bicarbonate
II. Washing soda - Sodium carbonate decahydrate
III. Plaster of Paris - Calcium sulfate hemihydrate
IV. Bleaching powder - Calcium oxychloride
V. Table salt - Potassium chloride
Which of the above pair(s) is/are incorrectly matched?
Explanation
Most of the listed salts are correctly matched with their chemical names: baking soda is sodium bicarbonate and bleaching powder is calcium oxychloride. However, common table salt is chemically sodium chloride, not potassium chloride. While potassium chloride is sometimes used as a salt substitute for dietary reasons, it is not the primary component of the standard table salt used globally for seasoning.Answer key for these questions
| Q | Correct answer |
|---|---|
| 581 | (b) Metallurgical skills to produce reflective bronze/copper surfaces for personal grooming |
| 582 | (d) 3 |
| 583 | (b) Luni |
| 584 | (b) Completely dissociate into ions in water |
| 585 | (a) A-iv, B-iii, C-i, D-ii |
| 586 | (a) Neutralization |
| 587 | (c) The core desert region of Thar has absolutely zero evidence of prehistoric human footprint across all epochs. |
| 588 | (c) Magnesium hydroxide |
| 589 | (a) I, II, III, and IV only |
| 590 | (d) V only |
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.