UPSC Prelims 2015 Question Paper
Explore the complete solved question paper for UPSC Prelims 2015 featuring 100 solved questions with bilingual (English & Hindi) explanations, official answer key, and subject weightage breakdown.
The term ‘IndARC’ sometimes seen in the news, is the name of?
Detailed Explanation:
IndARC (India's Arctic Research Station) is India's first underwater observatory deployed in the Arctic region.
It was deployed in 2014 in Kongsfjorden fjord, Svalbard, Norway to study Arctic climate and its influence on the Indian monsoon system.
Which one of the following is the national aquatic animal of India?
Detailed Explanation:
The Gangetic dolphin (Platanista gangetica) was declared India's National Aquatic Animal on 18th May 2010 by the Ministry of Environment and Forests.
This blind dolphin, also called susu, is listed as Endangered on the IUCN Red List with fewer than 2000 individuals remaining, facing threats from pollution and habitat destruction in the Ganga river system.
With reference to the Indian Renewable Energy Development Agency Limited (IREDA), which of the following statements is/are correct?
- It is a Public Limited Government Company.
- It is a Non – Banking Financial Company.
Select the correct answer using the code given below.
Detailed Explanation:
✅ Statement 1 – Correct: IREDA is a Public Limited Government Company established in 1987 under the Companies Act, 1956, under the administrative control of the Ministry of New and Renewable Energy (MNRE).
✅ Statement 2 – Correct: IREDA is registered as a Non-Banking Financial Company (NBFC) with the Reserve Bank of India (RBI) and provides term loans for renewable energy and energy efficiency projects.
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With reference to ‘fly ash’ produced by the power plants using coal as fuel, which of the following statements is/are correct?
- Fly ash can be used in the production of bricks for building construction.
- Fly ash can be used as a replacement for some of the Portland cement content of concrete.
- Fly ash is made up of silicon dioxide and calcium oxide only and does not contain any toxic elements.
Select the correct answer using the code given below
Detailed Explanation:
✅ Statement 1 – Correct: Fly ash possesses pozzolanic properties that enhance the strength and durability of bricks used in construction.
✅ Statement 2 – Correct: Fly ash can replace 20-30% of Portland cement in concrete, improving workability, reducing heat of hydration, and increasing long-term strength.
❌ Statement 3 – Incorrect: While fly ash mainly contains SiO2, Al2O3, and CaO, it also contains trace amounts of heavy metals like arsenic, mercury, chromium, and lead.
Which one of the following is associated with the issue of control and phasing out of the use of ozone-depleting substances?
Detailed Explanation:
Montreal Protocol (1987) is the international treaty specifically designed to control and phase out ozone-depleting substances (ODS) such as CFCs and halons.
Bretton Woods Conference (1944) established IMF and World Bank; Kyoto Protocol (1997) addresses greenhouse gas emissions; Nagoya Protocol (2010) deals with access and benefit-sharing of genetic resources under CBD.
With reference to ‘dugong’, mammal found in India, which of the following statements is/are correct?
- It is a herbivorous marine animal.
- It is found along the entire coast of India
- It is given legal protection under Schedule 1 of the Wildlife (Protection) Act, 1972.
Select the correct answer using the code given below.
Detailed Explanation:
✅ Statement 1 – Correct: Dugong is a herbivorous marine mammal that exclusively feeds on seagrass meadows in shallow coastal waters.
❌ Statement 2 – Incorrect: Dugongs are not found along the entire coast of India; they are restricted to Gulf of Mannar, Palk Bay, Gulf of Kutch, and Andaman & Nicobar Islands.
✅ Statement 3 – Correct: Dugong is accorded the highest protection under Schedule I of the Wildlife (Protection) Act, 1972, making hunting or harming them a serious offence.
What is Rio+20 Conference, often mentioned in the news?
Detailed Explanation:
Rio+20 Conference refers to the United Nations Conference on Sustainable Development (UNCSD) held in Rio de Janeiro, Brazil in June 2012.
It marked the 20th anniversary of the 1992 Earth Summit and produced the outcome document 'The Future We Want', focusing on green economy and poverty eradication.
With reference to bio-toilets used by the Indian Railways, consider the following statements:
- The decomposition of human waste in the bio-toilets is initiated by a fungal inoculum.
- Ammonia and water vapour are the only end products in this decomposition which are released into the atmosphere.
Which of the statements given above is/are correct?
Detailed Explanation:
❌ Statement 1 – Incorrect: Bio-toilets used by Indian Railways employ anaerobic bacteria (not fungi) as the inoculum to decompose human waste in an oxygen-free environment.
❌ Statement 2 – Incorrect: The decomposition produces methane gas, carbon dioxide, treated water (after chlorination), and minimal sludge – not just ammonia and water vapour.
Which of the following statements regarding ‘Green Climate Fund’ is/are correct?
- It is intended to assist the developing countries in adaptation and mitigation practices to counter climate change.
- It is founded under the aegis of UNEP, OECD, Asian Development Bank and World Bank
Select the correct answer using the code given below.
Detailed Explanation:
✅ Statement 1 – Correct: The Green Climate Fund (GCF) is intended to assist developing countries in adaptation and mitigation practices to counter climate change, providing financial support for climate resilience and emission reduction projects.
❌ Statement 2 – Incorrect: The GCF was established under the United Nations Framework Convention on Climate Change (UNFCCC) at COP 16 in Cancun, 2010, not under the aegis of UNEP, OECD, Asian Development Bank, or World Bank.
Which of the following National Parks is unique in being a swamp with floating vegetation that supports rich biodiversity?
Detailed Explanation:
Keibul Lamjao National Park in Manipur is the world's only floating national park, characterized by phumdis (floating decomposed vegetation mats) on Loktak Lake.
It is the last natural habitat of the endangered Sangai (Manipur Eld's deer/Brow-antlered deer), also known as the dancing deer, declared a National Park in 1977.
With reference to the International Union for Conservation of Nature and Natural Resources (IUCN) and the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES),
Which of the following statements is/are correct?
- IUCN is an organ of the United Nations and CITES is an international agreement between governments
- IUCN runs thousands of field projects around the world to better manage natural environments.
- CITES is legally binding on the States that have joined it, but this Convention does not take the place of national laws.
Select the correct using the code given below.
Detailed Explanation:
❌ Statement 1 – Incorrect: IUCN is an independent membership organization, not a UN organ. It includes governments, NGOs, and scientific institutions as members.
✅ Statement 2 – Correct: IUCN runs thousands of field projects worldwide for better management of natural environments and biodiversity conservation.
✅ Statement 3 – Correct: CITES is legally binding on States that have ratified it, but it does not replace national laws – each country implements it through domestic legislation.
Which one of the following National Parks has a climate that varies from tropical to subtropical, temperate and Arctic?
Detailed Explanation:
Namdapha National Park in Arunachal Pradesh has an elevation range from 200 m to 4,571 m, creating unique climatic zones from tropical to subtropical, temperate and Arctic.
This is the only National Park in India with four big cat species – tiger, leopard, clouded leopard, and snow leopard – due to its vast altitudinal variation.
With reference to ‘fuel cells’ in which hydrogen-rich fuel and oxygen are used to generate electricity. Consider the following statements:
- If pure hydrogen is used as a fuel, the fuel cell emits heat and water as by-products.
- Fuel cells can be used for powering buildings and not for small devices like laptop computers.
- Fuel cells produce electricity in the form of Alternating Current (AC).
Which of the statements given above is/are correct?
Detailed Explanation:
✅ Statement 1 – Correct: Pure hydrogen fuel cells emit only water (H₂O) and heat as by-products when hydrogen reacts with oxygen, making them a zero-emission energy source.
❌ Statement 2 – Incorrect: Fuel cells can power both large-scale applications (buildings, vehicles) and small portable devices (laptops, mobile phones). Micro fuel cells and portable fuel cells are already developed for consumer electronics.
❌ Statement 3 – Incorrect: Fuel cells produce electricity in Direct Current (DC) form, not Alternating Current (AC). An inverter is required to convert DC to AC for grid compatibility.
What can be the impact of excessive/inappropriate use of nitrogenous fertilizers in agriculture?
- The proliferation of nitrogen-fixing microorganisms in the soil can occur.
- Increase in the acidity of soil can take place
- Leaching of nitrate to the ground-water can occur.
Select the correct answer using the code given below.
Detailed Explanation:
❌ Statement 1 – Incorrect: Excessive nitrogenous fertilizers suppress nitrogen-fixing microorganisms because abundant soil nitrogen reduces their competitive advantage and metabolic activity.
✅ Statement 2 – Correct: Nitrogenous fertilizers (especially ammonium-based) undergo nitrification, releasing H⁺ ions that increase soil acidity.
✅ Statement 3 – Correct: Excess nitrates (NO₃⁻) are highly water-soluble and leach into groundwater, causing nitrate contamination and eutrophication of water bodies.
‘BioCarbon Fund Initiative for Sustainable Forest Landscapes’ is managed by the -
Detailed Explanation:
The BioCarbon Fund Initiative for Sustainable Forest Landscapes (ISFL) is managed by the World Bank.
The World Bank's Carbon Finance Unit serves as the permanent trustee and handles the day-to-day operations of the BioCarbon Fund, which includes the ISFL programme focused on reducing emissions from deforestation and forest degradation (REDD+).
With reference to ‘Forest Carbon Partnership Facility’, which of the following statements is/are correct?
- It is a global partnership of governments, businesses, civil society and indigenous peoples.
- It provides financial aid to universities, individual scientists and institutions involved in scientific forestry research to develop eco-friendly and climate adaptation technologies for sustainable forest management
- It assists the countries in their ‘REDD+ (Reducing Emission from Deforestation and Forest Degradation+)’ efforts by providing them with financial and technical assistance.
Select the correct answer using the code given below
Detailed Explanation:
✅ Statement 1 – Correct: The Forest Carbon Partnership Facility (FCPF) is a global partnership involving governments, businesses, civil society, and Indigenous Peoples to reduce emissions from deforestation and forest degradation.
❌ Statement 2 – Incorrect: FCPF does not provide financial aid to universities or individual scientists for research; it focuses on country-level REDD+ readiness and implementation support.
✅ Statement 3 – Correct: FCPF assists developing countries in REDD+ efforts by providing financial and technical assistance for capacity building and implementation.
Which one of the following is the best description of the term “ecosystem”?
Detailed Explanation:
Ecosystem = Biotic community (living organisms) + Abiotic environment (non-living factors like soil, water, air, sunlight) functioning together.
❌ Option 1: Describes only a biological community (lacks abiotic factors).
❌ Option 2: Defines the biosphere (entire zone of life on Earth).
✅ Option 3: Correctly captures both organisms and their environment as an integrated functional unit.
❌ Option 4: Refers to biota/biodiversity of a region (only living components).
With reference to an organization known as ‘Birdlife International’ which of the following statements is/are correct?
- It is a Global Partnership of Conservation Organizations.
- The concept of ‘biodiversity hotspots’ originated from this organization.
- It identifies the sites known/referred to as ‘Important Bird and Biodiversity Areas’.
Select the correct answer using the code given below.
Detailed Explanation:
✅ Statement 1 – Correct: BirdLife International is a global partnership of over 100 conservation NGOs working to conserve birds, their habitats, and biodiversity.
❌ Statement 2 – Incorrect: The biodiversity hotspots concept was originated by British ecologist Norman Myers (1988), later promoted by Conservation International, not BirdLife International.
✅ Statement 3 – Correct: BirdLife International identifies and monitors Important Bird and Biodiversity Areas (IBAs), a global network of critical sites for bird conservation and broader biodiversity.
There has been a persistent deficit budget year after year. Which of the following actions can be taken by the government to reduce the deficit?
- Reducing revenue expenditure
- Introducing new welfare schemes
- Rationalizing subsidies
- Expanding industries
Select the correct answer using the code given below.
Detailed Explanation:
✅ Statement 1 – Correct: Reducing revenue expenditure (salaries, pensions, subsidies, interest payments) directly decreases government spending and helps narrow the fiscal deficit.
❌ Statement 2 – Incorrect: Introducing new welfare schemes increases government expenditure, thereby widening the budget deficit rather than reducing it.
✅ Statement 3 – Correct: Rationalizing subsidies (targeting, reducing non-merit subsidies) controls unnecessary revenue expenditure and improves fiscal management.
❌ Statement 4 – Incorrect: Expanding industries may increase tax revenue in the long term but requires initial capital expenditure and does not immediately reduce the deficit.
When the Reserve Bank of India reduces the Statutory Liquidity Ratio by 50 basis points, which of the following is likely to happen?
Detailed Explanation:
Statutory Liquidity Ratio (SLR) is the minimum percentage of Net Demand and Time Liabilities (NDTL) that commercial banks must maintain in liquid assets (cash, gold, government securities).
✅ Statement 3 – Correct: Reducing SLR by 50 basis points frees up funds previously locked in government securities, increasing loanable funds with banks, enabling them to cut lending rates to stimulate borrowing.
❌ Statement 1 – Incorrect: SLR reduction is a monetary policy tool with moderate impact; GDP growth depends on multiple factors, not just one policy change causing 'drastic' increase.
❌ Statement 2 – Incorrect: Foreign Institutional Investors (FIIs) respond to interest rate differentials, equity market returns, and global conditions, not domestic SLR adjustments.
❌ Statement 4 – Incorrect: SLR reduction increases liquidity in the banking system by releasing funds for lending, not reducing it.
UPSC Prelims 2015 Questions Paper - Subject-wise Question Distribution
Indian Economy
18 Qs (18%)Environment & Ecology
18 Qs (18%)Indian Polity
14 Qs (14%)Science & Technology
10 Qs (10%)Modern History
8 Qs (8%)World Geography
7 Qs (7%)International Relations
7 Qs (7%)Indian Geography
6 Qs (6%)Indian Art & Culture
4 Qs (4%)Current Affairs
4 Qs (4%)Medieval History
4 Qs (4%)UPSC Prelims 2015 Question Paper - FAQs & Analysis
Q1 How many total questions were asked in UPSC Prelims 2015?
Q2 What is the subject-wise question breakdown for UPSC Prelims 2015?
- Indian Economy: 18 questions (18%)
- Environment & Ecology: 18 questions (18%)
- Indian Polity: 14 questions (14%)
- Science & Technology: 10 questions (10%)
- Modern History: 8 questions (8%)
- World Geography: 7 questions (7%)
- International Relations: 7 questions (7%)
- Indian Geography: 6 questions (6%)
- Indian Art & Culture: 4 questions (4%)
- Current Affairs: 4 questions (4%)
- Medieval History: 4 questions (4%)