90 previous year UPSC Prelims questions on the UPSC 2024 Prelims. Choose an option to see the answer and explanation.
Explanations state facts as of the year each question was asked; words like “recently” refer to that year.
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UPSC 2024Polity · Parliament
Q61. With reference to the Indian Parliament, consider the following statements: 1. A bill pending in the Lok Sabha lapses on its dissolution. 2. A bill passed by the Lok Sabha and pending in the Rajya Sabha lapses on the dissolution of the Lok Sabha. 3. A bill in regard to which the President of India notified his/ her intention to summon the Houses to a joint sitting lapses on the dissolution of the Lok Sabha. Which of the statements given above is/are correct?
Explanation
When the Lok Sabha is dissolved, all business, including bills, motions, resolutions, notices, petitions and so on pending before it or its committees lapse. They (to be pursued further) must be reintroduced in the newly constituted Lok Sabha. However, some pending bills do not lapse on the dissolution of the Lok Sabha. The position with respect to the lapsing of bills is as follows:
Statement 1 is correct: As per Rule 206 of the Lok Sabha Rules and Article 107(5) of the Constitution, any bill (whether it originated in the Lok Sabha or was transmitted to it by the Rajya Sabha) pending in the Lok Sabha automatically lapses upon its dissolution
Statement 2 is correct: If the Lok Sabha passes a bill, but it is pending in the Rajya Sabha, the bill lapses on the dissolution of the Lok Sabha (Article 107(5)).
Statement 3 is incorrect: If the President has already notified their intention to convene a joint sitting, then the bill remains alive and does not lapse even if the Lok Sabha is dissolved. Example: In 1970, the Banking Service Commission (Repeal) Bill was scheduled for a joint sitting, but before the sitting could take place, the Lok Sabha was dissolved. Since the President had already issued the notification for a joint sitting, the bill did not lapse and was carried forward.
Additional insight:
No. Position of the Bill Lapse of the Bill
1. A bill pending in the Lok Sabha Lapses
2. A bill passed by the Lok Sabha but pending in the Rajya Sabha Lapses
3. A bill not passed by both Houses due to disagreement, and the President has notified a joint sitting before the dissolution of the Lok Sabha Does not Lapse
4. A bill pending in the Rajya Sabha but not passed by the Lok Sabha Does not Lapse
5. A bill passed by both Houses but pending assent of the President Does not Lapse
UPSC 2024Polity · Parliament
Q62. With reference to the Parliament of India, consider the following statements: 1. Prorogation of a House by the President of India does not require the advice of the Council of Ministers. 2. Prorogation of a House is generally done after the House is adjourned sine die but there is no bar to the President of India prorogating the House which is in session. 3. Dissolution of the Lok Sabha is done by the President of India, who, save in exceptional circumstances, does so on the advice of the Council of Ministers. Which of the statements given above is/are correct?
Explanation
Statement 1 is incorrect: Prorogation (ending a session of Parliament) is done by the President on the advice of the Council of Ministers, as per Article 85(2)(a). The President does not act independently in this matter.
Statement 2 is correct: The presiding officer (Speaker or Chairman) declares the House adjourned sine die, when the business of a session is completed. Within the next few days, the President issues a notification for prorogation of the session. However, the President can also prorogate the House while in session.
Statement 3 is correct: Rajya Sabha, being a permanent House, is not subject to dissolution. Only the Lok Sabha is subject to dissolution. Unlike a prorogation, a dissolution ends the very life of the existing House, and a new House is constituted after general elections are held. Dissolution of the Lok Sabha is done by the President of India, who, save in exceptional circumstances, does so on the advice of the Council of Ministers.
UPSC 2024Science and Technology · Miscellaneous
Q63. Recently, the term "pumped-storage hydropower" is actually and appropriately discussed in the context of which one of the following?
Explanation
Pumped-storage hydropower (PSH) is primarily discussed in the context of long-duration energy storage. It is a type of hydroelectric power generation that stores excess electricity by pumping water from a lower reservoir to an upper reservoir during times of low energy demand. When energy demand is high, the stored water is released back down through turbines to generate electricity. This technology helps balance grid fluctuations, integrate renewable energy sources like wind and solar, and provide a reliable backup power supply.
UPSC 2024Polity · Parliament
Q64. Which of the following statements are correct in respect of a Money Bill in the Parliament? 1. Article 109 mentions special procedure in respect of Money Bills. 2. A Money Bill shall not be introduced in the Council of States. 3. The Rajya Sabha can either approve the Bill or suggest changes but cannot reject it. 4. Amendments to a Money Bill suggested by the Rajya Sabha have to be accepted by the Lok Sabha. Select the answer using the code given below:
Explanation
Statement 1 is correct: Article 109 outlines the special procedure for the passage of Money Bills, that include the exclusive role of the Lok Sabha and limited powers of the Rajya Sabha.
Statement 2 is correct: As per Article 109, a Money Bill shall not be introduced in the Council of States.
Statement 3 is correct: Rajya Sabha can only suggest amendments; it can neither amend nor reject the bill. If Lok Sabha accepts Rajya Sabha’s recommendations, the Money Bill is deemed passed with the accepted amendments. If Lok Sabha rejects all Rajya Sabha recommendations, the Money Bill is deemed passed in its original form, without any amendments suggested by the Council of States. If Rajya Sabha fails to return a Money Bill within 14 days, it is deemed passed by both Houses in its original form as approved by Lok Sabha.
Statement 4 is incorrect: After a Money Bill has been passed by the House of the People, it shall be transmitted to the Council of States for its recommendations, and the Council of States shall, within a period of fourteen days from the date of receipt of the Bill, return the Bill to the House of the People with its recommendations and the House of the People may thereupon either accept or reject all or any of the recommendations of the Council of States.
UPSC 2024Science and Technology · Miscellaneous
Q65. Which one of the following is the exhaust pipe emission from Fuel Cell Electric Vehicles, powered by hydrogen?
Explanation
The exhaust pipe emission from Fuel Cell Electric Vehicles (FCEVs) powered by hydrogen is water vapour. These vehicles use hydrogen fuel cells to generate electricity through an electrochemical reaction between hydrogen and oxygen. The only by-product of this process is water (H₂O), which is released as vapour, making FCEVs a clean and environmentally friendly transportation option. Fuel cells are unique in terms of the variety of their potential applications; they can use a wide range of fuels and feedstocks and can provide power for systems as large as a utility power station and as small as a laptop computer.
Additional insight:
Working of Hydrogen Fuel Cells Simply put, fuel cells work by combining hydrogen gas (H₂) with oxygen from the air - and the resulting chemical reaction produces electricity. Hydrogen atoms enter the fuel cell at the anode, while oxygen is fed to the cathode. The fuel cell consists of a membrane coated with a catalyst. When the hydrogen molecules hit the catalyst, they’re split into hydrogen ions and electrons. The membrane lets positively charged hydrogen ions pass through, but not the negatively charged electrons, which instead flow through an electric circuit where the electric current is generated. At the cathode side, the hydrogen ions, electrons and the oxygen in the air combine to produce heat. In order to produce enough electricity to be able to propel a vehicle, a complete fuel cell system consists of several hundred membranes stacked together. The fuel cell system is adequate for normal use, but whenever extra power is needed, it’s provided by a battery on the machine. When the fuel cells produce more power than the machine currently needs, the excess energy can be used to charge the battery. The battery is also charged by regenerative braking.
UPSC 2024Polity · Parliament
Q66. Which of the following statements about the Ethics Committee in the Lok Sabha are correct? 1. Initially, it was an ad-hoc Committee. 2. Only a Member of the Lok Sabha can make a complaint relating to the unethical conduct of a member of the Lok Sabha. 3. This Committee cannot take up any matter which is sub-judice. Select the answer using the code given below:
Explanation
Statement 1 is correct: The Lok Sabha Ethics Committee was first constituted as an ad hoc committee in 2000 by Speaker Late G.M.C. Balayogi, following a Committee of Privileges recommendation during the 13th Lok Sabha. It became a permanent committee in 2015.
Statement 2 is incorrect: Any person can complain against a Member through another Lok Sabha Member of Parliament, along with evidence of the alleged misconduct and an affidavit stating that the complaint is not "false, frivolous, or vexatious". If the Member himself complains, the affidavit is not needed.
Statement 3 is correct: The Committee does not entertain complaints based only on media reports or on matters that are sub-judice. The Committee makes a prima facie inquiry before deciding to examine a complaint. It makes its recommendations after evaluating the complaint. The Committee presents its report to the Speaker, who asks the House if it should be considered. A half-hour discussion is also provided.
UPSC 2024Polity · Parliament
Q67. How many Delimitation Commissions have been constituted by the Government of India till December 2023?
Explanation
Delimitation means the act or process of fixing the limits or boundaries of territorial constituencies in a country having a legislative body. In India, such Delimitation Commissions have been constituted four times:
1952 under the Delimitation Commission Act, 1952
1963 under the Delimitation Commission Act, 1962
1973 under the Delimitation Act, 1972
2002 under the Delimitation Act, 2002 Under Article 82, Parliament enacts a Delimitation Act after each Census, while Article 170 mandates the division of states into territorial constituencies as per the Delimitation Act. The ‘Delimitation Commission’ is set up under an act of Parliament.
UPSC 2024Environment and Ecology · Species
Q68. Consider the following: 1. Carabid beetles 2. Centipedes 3. Flies 4. Termites 5. Wasps Parasitoid species are found in how many of the above kind of organisms?
Explanation
Many animals are predators, parasites or parasitoids, using other animals as food. They use a great diversity of hunting strategies and behaviours to capture or feed on their prey. Invertebrate predators, parasites and parasitoids play an important role in keeping many animal populations under control. Parasitoid is an insect whose larvae feed and develop within or on the bodies of other arthropods. Each parasitoid larva develops on a single individual and eventually kills that host. Most parasitoids are wasps, but some flies and a small number of beetles (carabid beetles), moths, lacewings, and even one caddisfly species have evolved to be parasitoids. Parasitoids alone number about 68,000 named species, and most have yet to be named and described. Predator: They are organisms that capture and eat another (the prey). This act is called predation. The predatory invertebrates include scorpions, centipedes, predatory mites, predatory snails and slugs, nematodes and planarian worms. Detritivores: Termites are detritivores that eat dead and decaying organic matter like logs of wood in a forest. They form an important link in the cycling of nutrients in the forests by breaking down wood and organic residues on the ground
UPSC 2024Environment and Ecology · Species
Q69. Which one of the following shows a unique relationship with an insect that has coevolved with it and that is the only insect that can pollinate this tree?
Explanation
The banyan fig tree Ficus microcarpa is famous for its aerial roots, which sprout from branches and eventually reach the soil. Aerial roots are roots above the ground that are found in diverse plant species like mangroves, banyan figs and orchids. The tree also has a unique relationship with a wasp that has co-evolved with it and is the only insect that can pollinate it. Figs are known to sustain at least 1,200 bird and mammal species. Fig trees were among the earliest domesticated crops and appear as sacred symbols in Hinduism, Buddhism and other spiritual traditions.
UPSC 2024Environment and Ecology · Species
Q70. Consider the following: 1. Butterflies 2. Fish 3. Frogs How many of the above have poisonous species among them?
Explanation
Butterflies: Hybrid Heliconius butterflies are poisonous in nature. In nature, these butterflies are rare. Heliconius melpomene and Heliconius cydno are both highly poisonous, having evolved to produce their own cyanide, and predators have learned exactly what both of these toxic insects look like. Fish: "Venomous" fish are those that can inject their toxic venom into victims, whereas "poisonous" fish are those that cause toxic symptoms only if they are eaten. For example: Lionfish, red-bel-lied piranha etc. Frogs: Frogs are amphibians which can survive both on land and water. Some of them can be poisonous also. Poison dart frogs are small, brightly colored amphibians that live on tropical rainforest floors across Central and South America. Poison dart frogs are named for the toxins they secrete from their skin, which have traditionally been used to tips of hunters’ weapons. For example, the Embera and Noanama Indigenous people in western Colombia have used the skin of golden poison frogs (Phyllobates terribilis) to tip blowgun darts for hundreds of years.
Answer key for these questions
Q
UPSC year
Correct answer
61
2024
(b) 1 and 2
62
2024
(c) 2 and 3
63
2024
(c) Long duration energy storage
64
2024
(c) 1, 2 and 3
65
2024
(d) Water vapour
66
2024
(c) 1 and 3 only
67
2024
(d) Four
68
2024
(b) Only three
69
2024
(a) Fig
70
2024
(c) All three
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This page covers 90 previous year UPSC Prelims GS Paper-I questions on the UPSC 2024 Prelims, asked from 1995 to 2025. Each has the correct answer and an explanation.
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Questions on the UPSC 2024 Prelims are available for 31 years, from 1995 to 2025. Use the Year filter to practise a single paper.