UPSC Prelims 2018 — solved PYQs

102 previous year questions from the 2018 UPSC Prelims paper, organised by subject — each solved with option-by-option explanations.

2018 PYQs by subject

Solved questions

A selection of 25 solved questions — sign up free to practise all 102.

Q1ScienceSpace Science and AstronomyPYQ 2018

In which of the following areas can GPS technology be used? 1. Mobile phone operations 2. Banking operations 3. Controlling the power grids Select the correct answer using the code given below:

  • A1 only
  • B2 and 3 only
  • C1 and 3 only
  • D1, 2 and 3Correct

Explanation

Correct. GPS is used for location services in mobiles, precise time-stamping in banking transactions, and synchronisation of power grid frequencies across networks.

Why the other options are incorrect
Option A

GPS is also critical for time-synchronisation in banking transactions and power grid management.

Option B

Mobile phones rely heavily on GPS for location-based services and navigation, so 1 is also correct.

Option C

Banking operations use GPS-derived precise timing for transaction synchronisation, so 2 is also correct.

Q2Indian EconomyBanking SystemPYQ 2018

ATMs of different banks in India are able to interoperate primarily because of the switching network managed by:

  • ANational Payments Corporation of IndiaCorrect
  • BInsurance Regulatory and Development Authority of India
  • CInsolvency and Bankruptcy Board of India
  • DDepartment of Economic Affairs

Explanation

Correct. NPCI operates shared retail payment infrastructure including interbank ATM and card networks.

Why the other options are incorrect
Option B

This is incorrect because IRDAI regulates insurance, not retail payment switching.

Option C

This is incorrect because IBBI regulates insolvency professionals and processes.

Option D

This is incorrect because The Department of Economic Affairs does not run ATM switching.

Q3Indian EconomyBanking SystemPYQ 2018

The merger of associate banks with the State Bank of India was primarily aimed at:

  • ACreating a larger and more efficient banking entity with economies of scaleCorrect
  • BConverting SBI into a private bank
  • CEliminating all cooperative banks from the system
  • DTransferring RBI's monetary policy powers to SBI

Explanation

Correct. The merger consolidated SBI and its associate banks to achieve greater scale, operational efficiency and competitive strength.

Why the other options are incorrect
Option B

This is incorrect because SBI remains a public sector bank after the merger.

Option C

This is incorrect because The merger was about SBI consolidation, not cooperative bank elimination.

Option D

This is incorrect because Monetary policy remains with the RBI and its MPC.

Q4EnvironmentAgriculture, Biotechnology and EnvironmentPYQ 2018

With references to organic farming in India, consider the following statements: 1. 'The National Programme for Organic Production' (NPOP) is operated under the guidelines and directions of the Union Ministry of Rural Development. 2. 'The Agricultural and Processed Food Products Export Development Authority' (APEDA) functions as the Secretariat for the implementation of NPOP. 3. Sikkim has become India's first fully organic State. Which of the statements given above is/are correct?

  • A1 and 2 only
  • B2 and 3 onlyCorrect
  • C3 only
  • D1, 2 and 3

Explanation

Correct. APEDA serves as the NPOP secretariat under the Ministry of Commerce, and Sikkim was declared India's first fully organic state in 2016.

Why the other options are incorrect
Option A

Statement 1 is incorrect; NPOP is operated under the Ministry of Commerce and Industry, not Rural Development.

Option C

Statement 2 is also correct; APEDA functions as the implementing secretariat for NPOP.

Option D

Statement 1 is wrong because NPOP falls under the Ministry of Commerce and Industry, not the Ministry of Rural Development.

Q5History & CultureAdvent of Europeans and Company RulePYQ 2018

The staple commodities of export by the English East India Company from Bengal in the middle of the 18th century were:

  • ARaw cotton, oil-seeds and opium
  • BSugar, salt, zinc and lead
  • CCopper, silver, gold, spices and tea
  • DCotton, silk, saltpetre and opiumCorrect

Explanation

Correct. In the mid-eighteenth century, Bengal's main exports through the East India Company were cotton textiles, silk, saltpetre (used in gunpowder), and opium, which formed the backbone of the Company's profitable Bengal trade.

Why the other options are incorrect
Option A

While raw cotton and opium were important, oil-seeds were not a principal export commodity from Bengal in this period.

Option B

Sugar and salt were primarily for domestic consumption. Zinc and lead were not major Bengal exports.

Option C

India was an importer of precious metals (silver and gold), not an exporter. Tea cultivation in India began much later in the nineteenth century.

Q6Indian EconomyBanking SystemPYQ 2018

Merchant Discount Rate in digital payments refers to:

  • AThe charge paid by a merchant to the payment service provider or bank for accepting digital paymentsCorrect
  • BA subsidy paid by RBI to shopkeepers for accepting cash
  • CThe discount rate used by RBI in open market operations
  • DThe interest rate on warehouse receipts

Explanation

Correct. MDR is the fee linked to processing card or digital payment transactions for merchants.

Why the other options are incorrect
Option B

This is incorrect because MDR is not a cash handling subsidy.

Option C

This is incorrect because MDR is unrelated to monetary policy operations.

Option D

This is incorrect because This has no relation to payment acceptance charges.

Q7GeographyPlaces in News and Map-Based GeographyPYQ 2018

Which of the following has/have shrunk immensely or dried up in the recent past due to human activities? 1. Aral Sea 2. Black Sea 3. Lake Baikal Select the correct answer using the code given below.

  • A1 onlyCorrect
  • B2 and 3
  • C2 only
  • D1 and 3

Explanation

Correct. The Aral Sea, once the world's fourth-largest lake, has shrunk drastically since the 1960s because the rivers Amu Darya and Syr Darya were diverted for Soviet irrigation projects.

Why the other options are incorrect
Option B

The Black Sea has not shrunk immensely due to human activities. It remains a large, connected body of water.

Option C

The Black Sea has not experienced significant shrinkage from human activities.

Option D

Lake Baikal, the world's deepest and oldest freshwater lake, has not dried up. While it faces pollution concerns, it has not shrunk immensely.

Q8History & CultureTransfer of Power and Post-Independence IndiaPYQ 2018

Who among the following were the founders of the "Hind Mazdoor Sabha" established in 1948?

  • AB. Krishna Pillai, E.M.S. Namboodiripad and K.C. George
  • BJayaprakash Narayan, Deen Dayal Upadhyay and M.N. Roy
  • CC.P. Ramaswamy Iyer, K. Kamaraj and Veeresalingam Pantulu
  • DAshok Mehta, T.S. Ramanujam and G.G. MehtaCorrect

Explanation

Correct. Hind Mazdoor Sabha was founded in 1948 by socialist and independent trade-union leaders including Ashok Mehta, T.S. Ramanujam and G.G. Mehta as an alternative to the Communist-led AITUC.

Why the other options are incorrect
Option A

B. Krishna Pillai, E.M.S. Namboodiripad and K.C. George were Communist leaders primarily active in Kerala's left movement, not the founders of Hind Mazdoor Sabha.

Option B

Jayaprakash Narayan was a socialist leader but associated with the Praja Socialist Party. Deen Dayal Upadhyay was the ideologue of the Bharatiya Jana Sangh, and M.N. Roy founded the Radical Democratic Party. None founded HMS.

Option C

C.P. Ramaswamy Iyer was the Dewan of Travancore, K. Kamaraj was a Congress leader from Tamil Nadu, and Veeresalingam Pantulu was a 19th-century social reformer. They had no connection with HMS.

Q9Indian EconomyPublic Finance & TaxationPYQ 2018

Which of the following items are GST-exempt? 1. Cereal grains hulled 2. Chicken eggs cooked 3. Fish processed and canned 4. Newspapers containing advertising supplement

  • A1, 2 and 4 onlyCorrect
  • B2 only
  • C1, 3 and 4 only
  • D1, 2, 3 and 4

Explanation

Correct. Hulled cereal grains, cooked eggs and newspapers with supplements are exempt under GST, but processed and canned fish attracts GST.

Why the other options are incorrect
Option B

Cooked eggs are exempt, but so are hulled cereals and newspapers with advertising.

Option C

Processed and canned fish is not exempt; it attracts GST.

Option D

Processed and canned fish is taxable under GST, so not all four are exempt.

Q10EnvironmentProtected Areas and Conservation FrameworksPYQ 2018

In which of the following States is Pakhui Wildlife Sanctuary located?

  • AArunachal PradeshCorrect
  • BManipur
  • CMeghalaya
  • DNagaland

Explanation

Correct. Pakhui (Pakke) Wildlife Sanctuary is located in the East Kameng district of Arunachal Pradesh. It is known for its hornbill conservation efforts.

Why the other options are incorrect
Option B

Manipur is home to Keibul Lamjao National Park, not Pakhui Wildlife Sanctuary.

Option C

Meghalaya hosts Nokrek National Park and Balpakram National Park, not Pakhui.

Option D

Nagaland has Intanki National Park and Fakim Wildlife Sanctuary, not Pakhui.

Q11History & CultureBuddhism, Jainism and Heterodox TraditionsPYQ 2018

With reference to Indian history, who among the following is a future Buddha, yet to come to save the world?

  • AAvalokiteshvara
  • BLokesvara
  • CMaitreyaCorrect
  • DPadmapani

Explanation

Correct. Maitreya is identified in Buddhist tradition as the future Buddha who will appear on earth, achieve complete enlightenment, and teach the pure dharma when the current teachings have been forgotten.

Why the other options are incorrect
Option A

Avalokiteshvara is the Bodhisattva of compassion, not the future Buddha. He is already present in the Buddhist cosmology as a helping figure.

Option B

Lokesvara ('Lord of the World') is another name for Avalokiteshvara, the Bodhisattva of compassion. He is not designated as the future Buddha.

Option D

Padmapani ('holder of the lotus') is another name for Avalokiteshvara, the Bodhisattva of compassion. He is not the prophesied future Buddha.

Q12Indian EconomyAgriculturePYQ 2018

Consider the following statements about edible oil imports in India: 1. The quantity of imported edible oils is more than the domestic production of edible oils in recent years. 2. The Government of India does not impose any customs duty on all imported edible oils. Which of the statements given above is/are correct?

  • A1 onlyCorrect
  • B2 only
  • CBoth 1 and 2
  • DNeither 1 nor 2

Explanation

Correct. India imports a large quantity of edible oil that exceeds domestic production. However, the government does impose customs duties on imported edible oils, making statement 2 incorrect.

Why the other options are incorrect
Option B

Statement 2 is incorrect because the government does levy customs duty on imported edible oils.

Option C

Only statement 1 is correct; customs duty is levied on imported edible oils.

Option D

Statement 1 is correct as India's edible oil imports exceed domestic production.

Q13GeographyWorld Physical GeographyPYQ 2018

Consider the following pairs: Regions sometimes mentioned in the news — Country 1. Catalonia — Spain 2. Crimea — Hungary 3. Mindanao — Philippines 4. Oromia — Nigeria Which of the pairs given above are correctly matched?

  • A1, 2 and 3
  • B3 and 4 only
  • C1 and 3 onlyCorrect
  • D2 and 4 only

Explanation

Correct. Catalonia is an autonomous community in Spain, and Mindanao is the second-largest island in the Philippines. Crimea belongs to Ukraine (not Hungary), and Oromia is in Ethiopia (not Nigeria).

Why the other options are incorrect
Option A

Crimea is part of Ukraine (annexed by Russia in 2014), not Hungary. So pair 2 is incorrect.

Option B

Oromia is a region in Ethiopia, not Nigeria. Pair 4 is incorrect.

Option D

Crimea is not in Hungary and Oromia is not in Nigeria. Both pairs 2 and 4 are wrong.

Q14Indian EconomyPoverty & UnemploymentPYQ 2018

Which of the following is a key feature of the National Food Security Act, 2013?

  • ALegal entitlement to subsidized food grains for eligible householdsCorrect
  • BUniversal free supply of all food items
  • CAbolition of the Public Distribution System
  • DReplacement of nutrition schemes with cash only

Explanation

Correct. NFSA creates statutory food security entitlements through subsidized food grains for specified beneficiaries.

Why the other options are incorrect
Option B

The Act does not promise universal free supply of all food items.

Option C

It works through, rather than abolishes, the PDS architecture.

Option D

Nutrition support continues through multiple channels; it is not reduced to cash only.

Q15ScienceSpace Science and AstronomyPYQ 2018

With reference to the Indian Regional Navigation Satellite System (IRNSS), consider the following statements: 1. IRNSS has three satellites in geostationary and four satellites in geosynchronous orbits. 2. IRNSS covers entire India and about 5500 sq km beyond its borders. 3. India will have its own satellite navigation system with full global coverage by the middle of 2019. Which of the statements given above is/are correct?

  • A1 onlyCorrect
  • B1 and 2 only
  • C2 and 3 only
  • DNone

Explanation

Correct. IRNSS (NavIC) has 3 geostationary and 4 geosynchronous satellites. The coverage extends 1500 km beyond India's borders, not 5500 sq km, and NavIC is regional, not global.

Why the other options are incorrect
Option B

Statement 2 is incorrect; NavIC coverage extends about 1500 km beyond India's borders, not 5500 sq km.

Option C

Statement 2 overstates coverage area, and Statement 3 is wrong because NavIC is a regional system, not a global one.

Option D

Statement 1 correctly describes the satellite configuration of the NavIC constellation.

Q16Indian EconomyFiscal Policy & BudgetingPYQ 2018

Which of the following items were GST-exempt at the time of the question? 1. Cereal grains hulled 2. Chicken eggs cooked 3. Fish processed and canned 4. Newspapers with advertisements Select the correct answer using the code given below:

  • A1, 2 and 4 onlyCorrect
  • B2 only
  • C1, 3 and 4 only
  • D1, 2, 3 and 4

Explanation

Correct. Cereal grains, cooked eggs, and newspapers were among the exempt items, whereas processed and canned fish was not exempt in the way suggested.

Why the other options are incorrect
Option B

This is incorrect because exemption was not limited to cooked eggs alone.

Option C

This is incorrect because processed and canned fish was not part of the exempt set in the question.

Option D

This is incorrect because not all four items were exempt.

Q17EnvironmentInternational Environmental ConventionsPYQ 2018

The Partnership for Action on Green Economy (PAGE), a UN mechanism to assist countries transition towards greener and more inclusive economies, emerged at:

  • AThe Earth Summit on Sustainable Development 2002, Johannesburg
  • BThe United Nations Conference on Sustainable Development 2012, Rio de JaneiroCorrect
  • CThe United Nations Framework Convention on Climate Change 2015, Paris
  • DThe World Sustainable Development Summit 2016, New Delhi

Explanation

Correct. PAGE emerged from the Rio+20 Conference (2012), where countries called for a green-economy transition, and was launched in response to that mandate by five UN agencies.

Why the other options are incorrect
Option A

The 2002 Johannesburg Summit predates PAGE; it produced the Johannesburg Plan of Implementation.

Option C

The 2015 Paris conference focused on the climate agreement, not on launching PAGE.

Option D

The 2016 Delhi summit was organized by TERI; PAGE had already been launched by then.

Q18Polity & GovernanceParliament and State LegislaturesPYQ 2018

Consider the following statements: 1. The Speaker of the Legislative Assembly shall vacate his or her office if he or she ceases to be a member of the Assembly. 2. Whenever the Legislative Assembly is dissolved, the Speaker shall vacate his or her office immediately. Which of the statements given above is/are correct?

  • A1 onlyCorrect
  • B2 only
  • CBoth 1 and 2
  • DNeither 1 nor 2

Explanation

Correct. Under Article 179, the Speaker vacates office if he or she ceases to be a member of the Assembly. However, the Speaker does not vacate immediately on dissolution; the Speaker continues to hold office until just before the first meeting of the newly constituted Assembly.

Why the other options are incorrect
Option B

Statement 2 is incorrect. The Speaker continues in office even after dissolution until immediately before the first meeting of the next Assembly, analogous to the Lok Sabha Speaker under Article 94.

Option C

Statement 2 is false. The Speaker does not vacate office immediately upon dissolution.

Option D

Statement 1 is correct. Ceasing to be a member does cause the Speaker to vacate office.

Q19History & CultureAdvent of Europeans and Company RulePYQ 2018

Which among the following events happened earliest?

  • ASwami Dayanand established Arya Samaj
  • BDinabandhu Mitra wrote NeeldarpanCorrect
  • CBankim Chandra Chattopadhyay wrote Anandmath
  • DSatyendranath Tagore became the first Indian to succeed in the Indian Civil Services Examination

Explanation

Correct. Neeldarpan was written by Dinabandhu Mitra in 1858-60, depicting the plight of indigo cultivators in Bengal. This was the earliest of the listed events.

Why the other options are incorrect
Option A

Arya Samaj was founded in 1875, which is after Neeldarpan was written.

Option C

Anandmath was published in 1882, more than two decades after Neeldarpan.

Option D

Satyendranath Tagore passed the ICS examination in 1863, after Neeldarpan was written.

Q20Indian EconomyFinancial MarketsPYQ 2018

With reference to Government securities, consider the following statements: 1. Treasury Bills are issued only by the Government of India. 2. Treasury Bills are sold at a discount and redeemed at face value. Which of the statements given above is/are correct?

  • A1 only
  • B2 only
  • CBoth 1 and 2Correct
  • DNeither 1 nor 2

Explanation

Correct. Both statements correctly describe Treasury Bills.

Why the other options are incorrect
Option A

This is incorrect because Statement 2 is also correct for Treasury Bills.

Option B

This is incorrect because Statement 1 is also correct because T-Bills are sovereign central government instruments.

Option D

This is incorrect because Both statements are correct.

Q21EnvironmentClimate Change SciencePYQ 2018

The term 'sixth mass extinction/sixth extinction' is often mentioned in the news in the context of discussion of:

  • AWidespread monoculture practices in agriculture and large-scale commercial farming with indiscriminate use of chemicals in many parts of the world that may result in the loss of good native ecosystems
  • BFears of possible collision of a meteorite with the Earth in the near future in the manner it happened 65 million years ago that caused the mass extinction of many species including those of dinosaurs
  • CLarge-scale cultivation of genetically modified crops in many parts of the world and promoting their cultivation in other parts of the world which may cause the disappearance of good native crop plants and the loss of food biodiversity
  • DMankind's overexploitation/misuse of natural resources, fragmentation/loss of natural habitats, destruction of ecosystems, pollution and world climate changeCorrect

Explanation

Correct. The sixth mass extinction refers to the current accelerated loss of species driven by the full range of human impacts — habitat destruction, overexploitation, pollution, invasive species, and climate change.

Why the other options are incorrect
Option A

While monoculture contributes to biodiversity loss, the sixth extinction concept encompasses far broader drivers, not just agricultural practices.

Option B

The sixth extinction refers to the current ongoing event driven by human activities, not a future meteorite impact scenario.

Option C

GM crop concerns are only a small subset of the broader drivers. The sixth extinction is about comprehensive human-caused biodiversity collapse.

Q22ScienceSpace Science and AstronomyPYQ 2018

Consider the following phenomena: 1. Light is affected by gravity. 2. The universe is constantly expanding. 3. Matter warps its surrounding space-time. Which of the above is/are the prediction/predictions of Albert Einstein's General Theory of Relativity, often discussed in media?

  • A1 and 2 only
  • B3 only
  • C1 and 3 only
  • D1, 2 and 3Correct

Explanation

Correct. All three are predictions of general relativity: gravitational lensing, cosmic expansion (from the field equations), and the curvature of space-time by mass-energy.

Why the other options are incorrect
Option A

Statement 3 is also a prediction; the warping of space-time by mass is the central idea of general relativity.

Option B

Gravitational lensing (light affected by gravity) and the expanding universe are also predictions of general relativity.

Option C

The expanding universe also follows from Einstein's field equations and was later confirmed by Hubble's observations.

Q23Current AffairsInternational Relations and Groupings in NewsPYQ 2018

The term 'two state solution' is sometimes mentioned in the news in the context of the affairs of:

  • AChina
  • BIsraelCorrect
  • CIraq
  • DYemen

Explanation

Correct. The 'two-state solution' refers to creating separate Israeli and Palestinian states to resolve the Israel-Palestine conflict.

Why the other options are incorrect
Option A

The 'two-state solution' is not used in the context of China; cross-strait relations use different terminology.

Option C

Iraq's internal divisions are discussed in terms of federalism or ethnic-sectarian politics, not a 'two-state solution'.

Option D

Yemen's conflict is framed as a civil war; the term 'two-state solution' does not apply to it in standard diplomatic usage.

Q24History & CultureAdvent of Europeans and Company RulePYQ 2018

Regarding Wood's Dispatch, which of the following statements are true? 1. Grants-in-Aid system was introduced. 2. Establishment of universities was recommended. 3. English as a medium of instruction at all levels of education was recommended.

  • A1 and 2 onlyCorrect
  • B2 and 3 only
  • C1 and 3 only
  • D1, 2 and 3

Explanation

Correct. Wood's Dispatch of 1854 introduced the Grants-in-Aid system to support private educational institutions and recommended the establishment of universities in Calcutta, Bombay, and Madras. It did not recommend English at all levels.

Why the other options are incorrect
Option B

Statement 3 is incorrect. Wood's Dispatch advocated vernacular languages as the medium of instruction at lower levels, with English reserved for higher education.

Option C

Statement 3 is incorrect. The Dispatch supported vernacular instruction at the primary level.

Option D

Statement 3 is not true. Wood's Dispatch recommended a graded system using vernacular languages at lower levels and English at higher levels.

Q25EnvironmentAgriculture, Biotechnology and EnvironmentPYQ 2018

With reference to the 'Global Alliance for Climate Smart Agriculture (GACSA)', which of the following statements is/are correct? 1. GACSA is an outcome of the climate summit held in Paris in 2015. 2. Membership of GACSA does not create any binding obligations. 3. India was instrumental in the creation of GACSA. Select the correct answer using the code given below:

  • A1 and 3 only
  • B2 onlyCorrect
  • C2 and 3 only
  • D1, 2 and 3

Explanation

Correct. GACSA is a voluntary multi-stakeholder platform; its membership does not impose any legally binding commitments on participants.

Why the other options are incorrect
Option A

GACSA was launched at the 2014 UN Climate Summit in New York, not the 2015 Paris summit, and India was not instrumental in its creation.

Option C

India was not instrumental in creating GACSA and in fact initially expressed reservations about the concept of climate-smart agriculture.

Option D

Statement 1 is wrong because GACSA predates the Paris Agreement, and statement 3 is wrong because India did not play a founding role.

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