UPSC Prelims 2021 GS Answer Key

Water can dissolve more substances than any other liquid because

With reference to street lightning, how do sodium lamps differ from LED lamps ?

1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps.

2. As street lights, sodium lamps have longer life span than LED lamps.

3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street-lighting.

Select the correct answer using the code given below.

The term 'ACE2' is talked about in the context of

Bisphenol A (BPA), a cause of concern is a structural/key component in the manufacture of which of the following kinds of plastics ?

'Triclosan', considered harmful when exposed to high levels for a long time is most likely present in which of the following?

Which one of the following is the reason why astronomical distances are measured in light years?

We adopted parliamentary democracy based on the British model, but how does our model differ from that model?

1. As regards legislation, the British Parliament is supreme or sovereign but in India, the power of the Parliament to legislate is limited.

2. In India, matters related to the constitutionality of the Amendment of an Act of the Parliament are referred to the Constitution Bench by the Supreme Court.

Select the correct answer using the code given below :

With reference to the Union Government, consider the following statements :

1. N. Gopalaswamy Iyanger committee suggested that a minister and a secretary be designated solely for pursuing the subject of administrative reform and promoting it.

2. In 1970, the Department of Personnel was constituted on the recommendation of the Administrative Reforms Commission, 1966 and this was placed under the Prime Minister's charge.

Which of the Statements given above is/are correct?

'Right to Privacy' is protected under which Article of the constitution of India ?

Consider the following statements:

1. In India, there is no law restricting the candidates from contesting in one Lok Sabha election from three constituencies.

2. In 1991 Lok Sabha Election, Shri Devi Lal contested from three Lok Sabha constituencies.

3. As per the existing rules, if a candidate contests in one Lok Sabha election from Many constituencies, hi/her party should bear the cost of bye-elections to the constituencies vacated by him/her in the event of him/her winning in all the constituencies.

Which of the Statements given above is/are correct ?

The vegetation of savannah consists of grassland with scattered small trees, but extensive areas have no tree. The forest development in such areasis generally kept in check by one or more or a combination of some conditions.

Which of the following are such conditions?

1. Burrowing animals and termites

2. Fire

3. Grazing herbivores

4. Seasonal rainfall

5. Soil properties

Select the correct answer using the code given below:

With reference to the water on the planet Earth, consider the following statements:

1. The amount of water in the rivers and lakes is more than the amount of groundwater.

2. The amount of water in polar ice caps and glaciers is more than the amount of groundwater.

Which of the Statements given above is/are correct?

Consider the following statements:

1. Moringa (drumstick tree) is a leguminous evergreen tree.

2. Tamarind tree is endemic to South Asia.

3. In India, most of the tamarind is collected a sminor forest produce.

4. India exports tamarind and seeds of moringa.

5. Seeds of moringa and terminated can be used in the production of biofuels.

Which of the Statements given above is/are correct ?

The black cotton soil of India has been formed due to the weathering of

With reference to the recent developments regarding 'RecombinantVector Vaccines', consider the following statements:

1. Genetic engineering is applied in the development of these vaccines.

2. Bacteria and viruses are used as vector

Which of the Statements given above is/are correct?

In the context of hereditary diseases, consider the following statements:

1. Passing on mitochondrial diseases from parent to child can be prevented by mitochondrial replacement therapy either before or after in vitro fertilization of egg.

2. A child inherits mitochondrial disease entirely from mother and from father.

Which of the Statements given above is/are correct?

Bollgard I and Bollgard II technologies are mentioned in the context of

In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?

1. Area of the hole in the lid
2. Temperature of the flame
3. Weight of the lid

Select the correct answer using the code given below.

Consider the following :

1. Bacteria
2. Fungi
3. Virus

Which of the above can be cultured in artificial/synthetic medium?

Consider the following statements:

1 Adenoviruses have single-stranded DNA genomes whereas retroviruses have double-stranded DNA genomes.

2. Common cold is sometime caused by an adenovirus whereas AIDS is caused by a retrovirus.

Which of the statements given above is/are correct?

Consider the following statements:

1. 'Right to the City' is an agreed human right and the UN-Habitat monitors the commitments made by each country in this regard.

2. 'Right to the City' gives every occupant of the city the right to reclaim public spaces and public participation in the city.

3. 'Right to the City' means that the State cannot deny any public service or facility to the unauthorized colonies in the city.

Which of the statements given above is/are correct?

With reference to India, consider the following statements:

1. Judicial custody means an accused is in the custody of the concerned magistrate and such accused is locked up in police station, not in jail.

2. During judicial custody, the police officer in charge of the case is not allowed to interrogate the suspect without the approval of the court. Which of the statements given above is/are correct?

With reference to India, consider the following statements :

1. When a prisoner makes out a sufficient case, parole cannot be denied to such prisoner because it becomes a matter of his/her right.

2. State Governments have their own Prisoners Release on Parole Rules.

 Which of the statements given above is/are correct?

At the national level, which ministry is the nodal agency to ensure effective implementation of the Scheduled Tribes and Other Traditional Forest Dwellers (Recognition of Forest Rights) Act, 2006?

A legislation which confers on the executive or administrative authority an unguided and uncontrolled discretionary power in the matter of application of law violates which one of the following Articles of the Constitution of India?

Which one of the following in Indian polity is an essential feature that indicates that it is federal in character?

Which one of the following best defines the term 'State?

With reference to Indian judiciary, consider the following statements :

1. Any retired judge of the Supreme Court of India can be called back to sit and act as a Supreme Court judge by the Chief Justice of India with prior permission of the President of India.

2. A High Court in India has the power to review its own judgement as the Supreme Court does.

Which of the statements given above is/are correct?

With reference to India, consider the following statements :

1. There is only one citizenship and one domicile.

2. A citizen by birth only can become the Head of State.

3. A foreigner once granted the citizenship cannot be deprived of it under any circumstances.

Which of the statements given above is/are correct?

Which one of the following factors constitutes the best safeguard of liberty in a liberal democracy?

How is permaculture farming different from conventional chemical farming?

1. Permaculture farming discourages monocultural practices but in conventional chemical farming, monoculture practices are predominant.

2. Conventional chemical farming can cause increase in soil salinity but the occurrence such phenomenon is not observed in permaculture farming.

3. Conventional chemical farming is easily possible in semi-arid regions but permaculture farming is not so easily possible in such regions.

4. Practice of mulching is very important in permaculture farming but not necessarily so in conventional chemical farming.

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With reference to 'palm oil', consider the following statements :

1. The palm oil tree is native to Southeast Asia.

2. The palm oil is a raw material for some industries producing lipstick and perfumes.

3. The palm oil can be used to produce biodiesel.

Which of the statements given above are correct?

With reference to the Indus river system, of the following four rivers, three of them pour  into one of them the which joins the Indus direct. Among the following which one is such river that joins the Indus direct?

With reference to India, Didwana, Kuchaman, Sargol and Khatu are the names of

Consider the following rivers :

1. Brahma

2. Nagavali

3. Subarnarekha

4. Vamsadhara

Which of the above rise from the Eastern Ghats?

Consider the following statements :

1. The Global Ocean Commission grants licences for seabed exploration and mining in international waters.

2. India has received licences for seabed mineral exploration in international waters.

3. 'Rare earth minerals' are present on seafloor in international waters.

Which of the statements given above are correct?

Among the following, which one is the least water-efficient crop?

Consider the following statements :

1. In the tropical zone, the western sections of the oceans are warmer than the eastern sections owing to the influence of trade winds.

2. In the temperate zone, westerlies make the eastern sections of oceans warmer than the western sections.

Which of the statements given above is/are correct?

In the context of India's preparation for Climate-Smart Agriculture, consider the following statements :

1. The 'Climate-Smart Village' approach in India is a part of a project led by the Climate Change, Agriculture and Food Security (CCAFS), an international research programme.

2. The project of CCAFS is carried out under Consultative Groupon International Agricultural Research (CGIAR) headquartered in France.

3. The International Crops Research ffs Institute for the Semi-Arid Tropics (ICRISAT) in India is one of the CGIAR's research centres.

Which of the statements given above are correct?

"Leaf litter decomposes faster than in any other biome and as a result the soil surface is often almost bare. Apart from trees, the vegetation is largely composed of plant forms that reach up into the canopy vicariously, by climbing the trees or growing as epiphytes, rooted on the upper branches of trees." This is the most likely description of

Under the Indian Constitution, concentration of wealth violates

What is the position of the Right to Property in India?

What was the exact constitutional status
of India on 26th January, 1950?

Constitutional government means

With reference to India, the terms `Halbi, Ho and Kui' pertain to

Consider the following statements in respect of Bharat Ratna and Padma Awards:

1. Bharat Ratna and Padma Awards are titles under the Article 18(1) of the Constitution of India.
2. Padma Awards, which were instituted in the year 1954, were suspended only once.
3. The number of Bharat Ratna Awards is restricted to a maximum of five in a particular year.

Which of the above statements are not correct?

Consider the following statements :

          Statement 1 :

The United Nations Capital Development Fund (UNCDF) and the Arbor Day Foundation have recently recognized Hyderabad as 2020 Tree City of the World.

Statement 2 :

Hyderabad was selected for the recognition for a year following its commitment to grow and maintain the urban forests.

Which one of the following is correct in

respect of the above statements?

Consider the following statements in respect of the Laureus World Sports Award which was instituted in the year 2000 :

1. American golfer Tiger Woods was the first winner of this award.
2. The award was received mostly by `Formula One' players so far.
3. Roger Federer received this award maximum number of times compared to others.

Which of the above statements are correct?

Consider the following statements in respect of the 32nd Summer Olympics :

1. The official motto for this Olympics is 'A New World'.
2. Sport  Climbing, Surfing, Skateboarding, Karate and Baseball are included in this Olympics.

Which of the above statements is/are correct?

Consider the following statements in respect of the ICC World Test Championship:

1. The finalists were decided by the number of matches they won.
2. New Zealand was ranked ahead of England because it won more matches than England.

Which of the above statements is/are correct?

Consider the following statements:

1. The Governor of the Reserve Bank of India (RBI) is appointed by the Central Government.
2. Certain provisions in the  Constitution of India give the Central Government the right to issue directions to the RBI in public interest.
3. The Governor of the RBI draws his power from the RBI Act.

Which of the above statements are correct?

With reference to casual workers employed in India, consider the following statements:

1. All casual workers are entitled for Employees Provident Fund coverage.
2. All casual workers are entitled for regular working hours and overtime payment.
3. The government can by
   notification specify that an establishment or industry shall pay wages only through its bank account.

Which of the above statements are correct?

Which among the following steps is most likely to be taken at the time of an economic recession?

Consider the following statements:

Other things remaining unchanged, market demand for a good might increase if

1. price of its substitute increases
2. price of its complement increases
3. the good is an inferior good and income of the consumers increases
4. its price falls

Which of the above statements are correct?

With reference to 'Urban Cooperative Banks' in India, consider the following statements:

1. They are supervised and regulated by local boards set up by the State Governments.
2. They can issue equity shares and preference shares.
3. They were brought under the purview of the Banking Regulation Act, 1949 through an Amendment in 1966.

Which of the statements given above is/are correct?

Indian Government Bond Yields are influenced by which of the following?

1. Actions of the United States Federal Reserve
2. Actions of the Reserve Bank of India
3. Inflation and short-term interest rates 

Consider the following:

1. Foreign currency convertible bonds
2. Foreign institutional investment with certain conditions
3. Global depository receipts
4. Non-resident external deposits

Which of the above can be included in Foreign Direct Investments?

Consider the following statements:

The effect of devaluation of a currency is that it necessarily

1. improves the competitiveness of the domestic exports in the foreign markets
2. increases the foreign value of domestic currency
3. improves the trade balance

Which one of the following effects of creation of black money in India has been the main cause of worry to the Government of India?

Which one of the following is likely to be the most inflationary in its effects?

Which one of the following is used in preparing a natural mosquito repellent?

Consider the following kinds of organisms:

1. Copepods
2. Cyanobacteria
3. Diatoms
4. Foraminifera

Which one of the above are primary producers in the food chains of oceans?

Consider the following animals:

1. Hedgehog
2. Marmot
3. Pangolian

To reduce the chance of being captured by predators, which of the above organisms roll up/ roll up and protects/protect its/their vulnerable parts?

With reference to the ‘New York Declaration on Forests’, which of the following statements are correct?

1. It was first endorsed at the United Nations Climate Summit of 2014.
2. It endorses a global timeline to end the loss of forests.
3. It is a legally binding international declaration.
4. It is endorsed by governments, big companies and indigenous communities.
5. India was one of its signatories at its inception.

Select the correct answer using the code given below.

Magnetite, particles suspected to cause neurodegenerative problems, are generated as environmental pollutants from which of the following?

1. Brakes of motor vehicles
2. Engine of motor vehicles
3. Microwave stoves within homes
4. Power plants
5. Telephone lines

Select correct answer using the code given below.

Which one of the following is filter feeder?

In case of which one of the following biogeochemical cycles, the weathering of rocks in the main source of release of nutrient to enter the cycle?

Which one of the following are detritivores?

1. Earthworms
2. Jellyfish
3. Millipedes
4. Seahorses
5. Woodlice

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The ‘Common Carbon Metric’, supported by UNEP, has been develop for

Which one of the following have species that can establish symbiotic relationship with other organisms?

1. Cnidarians
2. Fungi
3. Protozoa

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The money multiplier in an economy increases with which one of the following?

With reference to Indian economy, demand-pull inflation can be caused/increased by which of the following?

1. Expansionary policies
2. Fiscal stimulus
3. Inflation-indexing wages
4. Higher purchasing power
5. Rising interest rates

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With reference to India, consider the following statements:

1. Retail investors through demat account can invest in Treasury Bills and Government of India Debt Bonds in primary market.
2. The Negotiated Dealing System Order Matching is a government securities trading platform of the Reserve Bank ofc India
3. The Central Depository Services Ltd is jointly promoted by Reserve Bank of India and the Bombay Stock exchange.

Which of the statements given above is/are correct?

With reference to ‘Water Credit’, consider the following statements:

1. It put microfinances tools to work in the water and sanitation sector.
2. It is a global initiative launched under the aegis of the World Health Organization and World Bank.
3. It aims to enable the poor people to meet their water needs without depending on subsidies.

Which of the following statements given above are correct?

In India, the central banks functions as the ‘lender of the last resort’ usually refers to which of the following?

1. Lending to trade and industry bodies when they fail to borrow from other sources.
2. Providing liquidity to the banks having a temporary crisis
3. Lending to governments to finance budgetary deficits.

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‘R2 Code of Practices’ constitutes a tool available for promoting the adoption of

Why is there a concern about copper smelting plants?
They may release lethal quantities of carbon monoxide into environment.

1. The copper slag can cause the leaching of some heavy metals into environment.
2. They may release Sulphur dioxide as a pollutant.

Select the correct answer using the code given below.

With reference to furnace oil, consider the following statements:

1. It is a product of oil refineries.
2. Some industries use it to generate power.
3. Its use causes Sulphur emissions into environment.

Which of the statements given above are correct?

What is blue carbon?

In the nature, which of the following is/ are most likely to be found surviving on a surface without soil?
 

         1. Fern

         2.Lichen

         3.Moss

    4.Mushroom

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With reference to the history of ancient India, Bhavanhuti, Hastimalla and Kshemeshvara were famous

Consider the following statements:

1) The Montagu-Chelmsford reforms of 1919 recommended granting voting rights to all the women above the age of 21.

2) The Government of India act of 1935 gave women reserved seats in legislature.

Which of the statements given above is/ are correct?

With reference to 8 August, 1942 to in Indian history, which one of the following statements is correct?

Who among the following is associated with ‘songs from prison’, a translation of ancient Indian religious lyrics in English?

With reference to medival India, Which one of the following is the correct sequence in ascending order in terms of size?

Who among the following was associated as secretary with Hindu female school which later come to be known as Bethune female school?

In the context of colonial India, Shah Nawaz Khan, Prem Kumar Sehgal and Gurbaksh Singh Dhillon are remember as

With reference to Indian history, which of the following statements is are correct?

1. the Nizamat of Arcot emerged out of Hyderabad state.

2. The Mysore kingdom emerged out of Vijayanagara empire.

3. Rohilkhand Kingdom was formed out of the territories occupied by the Ahmad Shah Durrani.

Select the correct answer using the codes given below.

Which one of the following statements is correct?

Consider the following statements:

1. 21st February is declared to be the international mother language day by UNICEF.

2. The demand that Bangla has to be one of the national languages was raised in the constituent assembly of Pakistan.

Which of the above statement is are correct?

With reference to Chausath Yogini temple situated near Morena , consider the following statements:

1. It is a circular temple built during the reign of Kachchhapaghata dynasty.

2. It is the only circular temple built in India.

3. It was meant to promote the Vaishnava cult in the region.

4. Its design has given rise to a popular belief that it was the inspiration behind the Indian parliament building.

Which of the above statement is are correct?

Which one of the following ancient towns is well known for its elaborate system of water harvesting and management by building a series of dams and channelizing water into connected reservoirs?

In the first quarter of 17th century, in which of the following was/were the factory/factories of the English East India company located?

1) Broach

2) Chicacole

3) Trichinopoly

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From the decline of Guptas until the rise of Harshavardhana in the early seventeenth century, which of the following kingdoms were holding power in Northern India?

1. The Guptas of Magadha

2. The Paramaras of Malwa

3. The Pushyabhutis of Thanesar

4. The Maukharis of kanauj

5. The Yadavas of Devagiri

6. The Maitrakas of Valabhi

Select the correct answer using the code given below.

According to Portuguese writer Nuniz, the women in Vijayanagara Empire were expert in the following areas?

1. Wrestling

2. Astrology

3. Accounting

4. Soothsaying

Select the Correct Answer

With reference to the Madanapalle of Andhra Pradesh, which one of the following statements is correct?

Consider the following Pairs :

( Historical Place)   :        ( Well-known for )

1. Burzahom              :        rock-cut shrines
2. Chendra-Ketugarh :        Terracotta art
3. Ganeshwar            :        Copper artefacts

Which of the pairs given above is/are correctly matched?

Consider the following statements:

1. It was during the reign of Iltutmish that Chengiz Khan reached the Indus in pursuit of the fugitive Khwarezm Prince.

2. It was during the reign of Muhammad bin Tughluq that Taimur occupied Multan and crossed the Indus.

3. It was during the reign of Deva Raya II of Vijayanagara Empire that Vasco da Gama reached the coast of Kerala.

Which of the following statements given above is correct?

Consider the following statements:

1. St. Francis Xavier was one of the founding members of Jesuit order.

2. St. Francis Xavier died in Goa and the church is dedicated to him there.

3. The feast of St. Francis Xavier is celebrated in Goa each year.

Which of the following statements given are correct?

With reference to the history of ancient India, which of the following statements is are correct?

1. Mitakshara was the civil law for upper castes and Dayabhaga was the civil law for the lower castes.

2. In the Mitakshara system, the sons can claim right to property during the lifetime of the father, whereas in the Dayabhaga system, it is only after the death of the father that the sons can claim right to the property.

3. The Mitakshara system deals with the matters related to the property held by male members only of the family, whereas the Dayabhaga system deals with matters related to the property held by both male and female members of the family.

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