Q1.General ScienceAsked in: NDA · NDA-II 2026, GATHard
- A.530 Cal/g
- B.540 Cal/g
- C.550 Cal/g
- D.560 Cal/g
Show answer
Correct answer: C. 550 Cal/g
The heat given out by 2 g of steam equals the heat taken in by 250 g of water, and that balance gives L = 550 Cal/g. The water warms from 20°C to 25°C, so it absorbs 250 × 1 × 5 = 1250 Cal.
Read the full explanation →Q2.General ScienceAsked in: NDA · NDA-II 2025, GATEasy
- A.Reflection of light
- B.Refraction of light
- C.Interference of light
- D.Diffraction of light
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Correct answer: B. Refraction of light
Light from the bottom bends as it passes from water into air, so the bottom seems nearer than it really is.
Read the full explanation →Q3.General ScienceAsked in: NDA · NDA-I 2025, GATMedium
- A.The molecules of soap are sodium or potassium salts of long chain fatty acids
- B.The molecules of soap contain both hydrophobic and hydrophilic ends
- C.Detergents are more effective than soaps in hard water
- D.In micelles the ionic-end of the molecules is towards oil droplet while the other end faces outside
Show answer
Correct answer: D. In micelles the ionic-end of the molecules is towards oil droplet while the other end faces outside
In a micelle it is the long hydrocarbon tail that points into the oil droplet, while the ionic end faces outward into the water, so statement D reverses the real picture.
Read the full explanation →Q4.Indian EconomyAsked in: NDA · NDA-II 2024, GATMedium
- A.1 only
- B.2 only
- C.Both 1 and 2
- D.Neither 1 nor 2
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Correct answer: C. Both 1 and 2
The Cabinet resolution that set up the Planning Commission in March 1950 named both aims.
Read the full explanation →Q5.Indian HistoryAsked in: NDA · NDA-II 2023, GATEasy
- A.Bands of revolutionaries moving around to terrorise people who did not participate in the revolution
- B.The royal forces punishing people who participated in the revolution
- C.Trial and beheading persons considered enemies of the republic by the revolutionary tribunal
- D.The general atmosphere of insecurity perceived by people after the beheading of the king
Show answer
Correct answer: C. Trial and beheading persons considered enemies of the republic by the revolutionary tribunal
The Reign of Terror (1793–94) was the period when revolutionary tribunals tried and guillotined people seen as enemies of the republic.
Read the full explanation →Q6.General ScienceAsked in: NDA · NDA-I 2023, GATEasy
- A.using table sugar.
- B.preserving in a container.
- C.using lemon juice.
- D.using milk of magnesia.
Show answer
Correct answer: C. using lemon juice.
Lemon juice is acidic and rich in vitamin C, which together slow the enzyme reaction that browns cut apple. When an apple is cut, the enzyme polyphenol oxidase in its cells meets oxygen in the air and oxidises the fruit's phenolic compounds into brown pigments (melanins).
Read the full explanation →Q7.General ScienceAsked in: NDA · NDA-II 2022, GATMedium
- A.sodium
- B.potassium
- C.iron
- D.sodium and potassium
Show answer
Correct answer: D. sodium and potassium
A nerve impulse is carried by the movement of sodium ions into the nerve cell and potassium ions out of it.
Read the full explanation →Q8.General ScienceAsked in: NDA · NDA-I 2022, GATEasy
- A.1 only
- B.2 only
- C.Both 1 and 2
- D.Neither 1 nor 2
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Correct answer: C. Both 1 and 2
Growth with repair and metabolism are two of the features that mark living beings off from non-living things. A living body grows from inside by making new cells from the food it takes in, and it heals wounds and replaces worn-out tissue.
Read the full explanation →Q9.Indian HistoryAsked in: NDA · NDA-II 2021, GATMedium
- A.1810
- B.1793
- C.1885
- D.1832
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Correct answer: D. 1832
By 1832 the British had marked out a large tract in the Rajmahal hills as Damin-i-koh and declared it the land of the Santhals.
Read the full explanation →Q10.General ScienceAsked in: NDA · NDA-I 2021, GATEasy
- A.Ribosomes.
- B.Mitochondria.
- C.Lysosomes.
- D.Endoplasmic reticulum.
Show answer
Correct answer: D. Endoplasmic reticulum.
Its network of membrane tubes and sheets forms channels that carry materials, especially proteins, between parts of the cytoplasm and the nucleus.
Read the full explanation →Q11.General ScienceAsked in: NDA · NDA-II 2019, GATMedium
- A.Change in internal energy of the system is equal to flow of heat in or out of the system.
- B.Change in internal energy of the system is less than heat transferred.
- C.Change in internal energy of the system is more than the heat flow.
- D.Cannot be determined.
Show answer
Correct answer: A. Change in internal energy of the system is equal to flow of heat in or out of the system.
With no work done, the first law of thermodynamics reduces to ΔU = Q, so the change in internal energy equals the heat that flows in or out.
Read the full explanation →Q12.GeographyAsked in: NDA · NDA-I 2019, GATMedium
- A.East Asia
- B.West Coast of Africa
- C.Sahara of Africa
- D.Mesopotamia
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Correct answer: D. Mesopotamia
The Shamal is a hot, dry north-westerly wind that blows over Iraq and the Persian Gulf, the old land of Mesopotamia.
Read the full explanation →Q13.General ScienceAsked in: NDA · NDA-I 2018, GATMedium
- A.single stranded circular DNA
- B.double stranded DNA
- C.single stranded RNA
- D.double stranded RNA
Show answer
Correct answer: C. single stranded RNA
AIDS is caused by HIV, a retrovirus whose genome is two copies of single-stranded RNA. After HIV enters a helper T-cell (CD4 cell), its enzyme reverse transcriptase copies the viral RNA into DNA, which is then built into the host cell's own DNA.
Read the full explanation →Q14.General ScienceAsked in: NDA · NDA-II 2017, GATEasy
- A.Fibrin
- B.Collagen
- C.Elastin
- D.Cellulose
Show answer
Correct answer: B. Collagen
Tendons are made of tightly packed parallel bundles of collagen fibres, which give them great pulling strength. Collagen is the most abundant protein in the human body.
Read the full explanation →Q15.General ScienceAsked in: NDA · NDA-I 2017, GATEasy
- A.Electron
- B.Proton
- C.Nucleus
- D.Helium
Show answer
Correct answer: C. Nucleus
Rutherford's gold foil experiment showed that an atom's positive charge and almost all its mass sit in a tiny central nucleus.
Read the full explanation →Q16.General ScienceAsked in: NDA · NDA-I 2026, GATMedium
- A.x = 14 and y = 32
- B.x = 16 and y = 30
- C.x = 18 and y = 32
- D.x = 18 and y = 30
Show answer
Correct answer: C. x = 18 and y = 32
The sulphide ion has 16 + 2 = 18 electrons, and its mass number of 32 is its count of nucleons.
Read the full explanation →Q17.General ScienceAsked in: NDA · NDA-II 2025, GATEasy
- A.Sonographic Natural Ranging
- B.Simple Operational Navigation Ranging
- C.Sound Navigation and Ranging
- D.Simple Operational Natural Ranging
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Correct answer: C. Sound Navigation and Ranging
SONAR uses sound waves under water to find the distance and direction of objects. A SONAR set on a ship has a transmitter that sends out pulses of ultrasound and a detector that picks up their echo from the sea bed, a shoal of fish, a wreck or a submarine.
Read the full explanation →Q18.General ScienceAsked in: NDA · NDA-I 2025, GATMedium
- A.A neutron is formed by combination of an electron and a proton. Therefore, it is neutral
- B.The mass of an electron is about 1/2000 times that of a proton
- C.An isotope of cobalt is used in the treatment of goiter
- D.J.J. Thomson proposed that the nucleus of an atom contains only neutrons
Show answer
Correct answer: B. The mass of an electron is about 1/2000 times that of a proton
An electron's mass is about 1/1836 of a proton's, which is roughly 1/2000. The electron has a mass of about 9.1 × 10⁻³¹ kg, while the proton has about 1.67 × 10⁻²⁷ kg, nearly 1,836 times heavier.
Read the full explanation →Q19.Indian EconomyAsked in: NDA · NDA-II 2024, GATHard
- A.1 only
- B.1 and 3
- C.3 and 4
- D.1,2 and 4
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Correct answer: B. 1 and 3
The First and Ninth Plans gave top priority to agriculture, and the Seventh Plan's slogan was food, work and productivity.
Read the full explanation →Q20.GeographyAsked in: NDA · NDA-I 2024, GATEasy
- A.1 only
- B.1 and 2 only
- C.2 and 3 only
- D.1,2 and 3
Show answer
Correct answer: B. 1 and 2 only
Clouds are grouped by height and shape into high, middle and low families, but stratus, nimbostratus and stratocumulus are low clouds, not high ones.
Read the full explanation →Q21.Indian HistoryAsked in: NDA · NDA-II 2023, GATHard
- A.From a continent of creditors it turned into a continent of debtors
- B.Soldiers came to be placed higher in social status than civilians
- C.Popular support decreased for conservative dictatorship which had come into being recently
- D.National honour occupied centre stage in the public sphere
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Correct answer: C. Popular support decreased for conservative dictatorship which had come into being recently
The war did not reduce support for conservative dictatorships; popular support for them actually grew after 1918. The First World War (1914–18) left Europe drained.
Read the full explanation →Q22.General ScienceAsked in: NDA · NDA-I 2023, GATEasy
- A.Methane, Butane, Propane, Heptane
- B.Propane, Butane, Pentane, Octane
- C.Propane, Butane, Heptane, Methane
- D.Octane, Ethane, Methane, Propane
Show answer
Correct answer: B. Propane, Butane, Pentane, Octane
In the alkane series the boiling point rises as the carbon chain gets longer, and this order goes from 3 to 4 to 5 to 8 carbons.
Read the full explanation →Q23.General ScienceAsked in: NDA · NDA-II 2022, GATEasy
- A.silver chloride
- B.silver oxide
- C.silver sulphide
- D.silver sulphate
Show answer
Correct answer: C. silver sulphide
Silver turns black in air because it reacts with sulphur compounds, mainly hydrogen sulphide, to form a thin black coating of silver sulphide (Ag₂S).
Read the full explanation →Q24.General ScienceAsked in: NDA · NDA-I 2022, GATEasy
- A.Chloroplast
- B.Leucoplast
- C.Chromoplast
- D.Xanthoplast
Show answer
Correct answer: B. Leucoplast
Leucoplasts are colourless plastids that store food: starch, oils and proteins. Plastids are found only in plant cells and some algae, and they are of three main kinds.
Read the full explanation →Q25.GeographyAsked in: NDA · NDA-II 2021, GATEasy
- A.Manipur
- B.West Bengal
- C.Gujarat
- D.Jharkhand
Show answer
Correct answer: A. Manipur
The Tropic of Cancer (23.5°N) passes through eight Indian states, and Manipur is not one of them; it lies just to the north.
Read the full explanation →Q26.General ScienceAsked in: NDA · NDA-I 2021, GATMedium
- A.Outer membrane.
- B.Matrix.
- C.Inner membrane.
- D.DNA of mitochondria.
Show answer
Correct answer: C. Inner membrane.
The enzyme that makes most of the cell's ATP, ATP synthase, sits in the inner mitochondrial membrane along with the electron transport chain.
Read the full explanation →Q27.General ScienceAsked in: NDA · NDA-I 2020, GATEasy
- A.Calcium hydrogen carbonate
- B.Calcium carbonate
- C.Calcium acetate
- D.Sodium carbonate
Show answer
Correct answer: B. Calcium carbonate
Chalk, limestone and marble are all forms of calcium carbonate, CaCO₃. Chalk is a soft, porous rock built from the tiny shells of marine plankton.
Read the full explanation →Q28.GeographyAsked in: NDA · NDA-I 2019, GATHard
- A.Orographic rainfall
- B.Convectional rainfall
- C.Cyclonic rainfall (Tropical)
- D.Cyclonic rainfall (Temperate)
Show answer
Correct answer: A. Orographic rainfall
On a mountain slope, rainfall increases with height only up to a certain level and then decreases above it; this is called the inversion of rainfall.
Read the full explanation →Q29.Environment & EcologyAsked in: NDA · NDA-II 2018, GATHard
- A.1-2-3-4
- B.2-4-3-1
- C.2-3-4-1
- D.3-1-2-4
Show answer
Correct answer: C. 2-3-4-1
From south to north the order is Bhadra (Karnataka), Simlipal (Odisha), Pachmarhi (Madhya Pradesh) and Shikari Devi (Himachal Pradesh). Bhadra lies in the Western Ghats of Chikkamagaluru district, Karnataka, at about 13.5°N, and is a tiger reserve.
Read the full explanation →Q30.General ScienceAsked in: NDA · NDA-I 2018, GATEasy
- A.Cell wall
- B.Mitochondria
- C.Plasma membrane
- D.Ribosome
Show answer
Correct answer: B. Mitochondria
Prokaryotic cells such as bacteria have no membrane-bound organelles, so they lack mitochondria. Prokaryotes have no true nucleus: their DNA lies in a region called the nucleoid, and they have no mitochondria, chloroplasts, endoplasmic reticulum or Golgi body.
Read the full explanation →Q31.Indian HistoryAsked in: UPSC Civil Services · CSE Prelims 2023, GS Paper IEasy
- A.capital cities
- B.ports
- C.centres of iron-and-steel making
- D.shrines of Jain Tirthankaras
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Correct answer: B. ports
All three were busy harbours of the Sangam age, through which the Tamil kingdoms traded with Rome, West Asia and South-East Asia.
Read the full explanation →Q32.Indian EconomyAsked in: UPSC Civil Services · CSE Prelims 2024, GS Paper IMedium
- A.Only one
- B.Only two
- C.Only three
- D.All four
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Correct answer: B. Only two
Pairs 2 and 4 are correct; pairs 1 and 3 have the categories the wrong way round. Physical capital is split by how long it lasts in production.
Read the full explanation →Q33.Science & TechnologyAsked in: UPSC Civil Services · CSE Prelims 2022, GS Paper IMedium
- A.A hypersonic missile is launched into space to counter the asteroid approaching the Earth and explode it in space.
- B.A spacecraft lands on another planet after making several orbital motions.
- C.A missile is put into a stable orbit around the Earth and deorbits over a target on the Earth.
- D.A spacecraft moves along a comet with the same speed and places a probe on its surface.
Show answer
Correct answer: C. A missile is put into a stable orbit around the Earth and deorbits over a target on the Earth.
In a Fractional Orbital Bombardment System, a warhead is placed in a low orbit around the Earth and then brought down out of that orbit onto its target.
Read the full explanation →Q34.Indian HistoryAsked in: UPSC Civil Services · CSE Prelims 2021, GS Paper IHard
- A.1 and 2
- B.2 only
- C.1 and 3
- D.3 only
Show answer
Correct answer: B. 2 only
The real difference between the two schools is when a son's right to ancestral property arises, not caste or the sex of the owner.
Read the full explanation →Q35.Environment & EcologyAsked in: UPSC Civil Services · CSE Prelims 2020, GS Paper IMedium
- A.1, 2 and 3 only
- B.2 and 4 only
- C.1, 3 and 4 only
- D.1, 2, 3, 4 and 5
Show answer
Correct answer: D. 1, 2, 3, 4 and 5
All five release benzene, either by burning carbon-based material or by giving off fumes from solvents and synthetic materials. Benzene is a volatile organic compound and a known human carcinogen linked to leukaemia.
Read the full explanation →Q36.GeographyAsked in: UPSC Civil Services · CSE Prelims 2019, GS Paper IMedium
- A.1 only
- B.2 and 3 only
- C.3 only
- D.1, 2 and 3
Show answer
Correct answer: D. 1, 2 and 3
Satellite sensors are used to estimate all three, because each leaves a signature in the light or heat a place gives off.
Read the full explanation →Q37.Science & TechnologyAsked in: UPSC Civil Services · CSE Prelims 2018, GS Paper IHard
- A.The civilian nuclear reactors come under IAEA safeguards.
- B.The military nuclear installations come under the inspection of IAEA.
- C.The country will have the privilege to buy uranium from the Nuclear Suppliers Group (NSG).
- D.The country automatically becomes a member of the NSG.
Show answer
Correct answer: A. The civilian nuclear reactors come under IAEA safeguards.
For India, the Additional Protocol strengthens IAEA oversight of the civilian nuclear facilities India has chosen to place under safeguards; its military programme stays outside.
Read the full explanation →Q38.Indian HistoryAsked in: UPSC Civil Services · CSE Prelims 2016, GS Paper IEasy
- A.agriculturists
- B.warriors
- C.weavers
- D.traders
Show answer
Correct answer: D. traders
The Banjaras were travelling traders and carriers who moved goods across the country on long caravans of pack oxen. Their caravans, called tanda, could have thousands of bullocks carrying grain, salt and other goods from the countryside to towns and markets.
Read the full explanation →Q39.General ScienceAsked in: UPSC Civil Services · CSE Prelims 2025, GS Paper IMedium
- A.Only one
- B.Only two
- C.All the three
- D.None
Show answer
Correct answer: D. None
Each statement says "no virus can", and each is disproved by well-known viruses.
Read the full explanation →Q40.Banking & Financial AwarenessAsked in: UPSC Civil Services · CSE Prelims 2024, GS Paper IHard
- A.1 only
- B.2 only
- C.Both 1 and 2
- D.Neither 1 nor 2
Show answer
Correct answer: B. 2 only
RBI does set a minimum capital for a foreign bank's wholly owned subsidiary, and it requires at least half the board to be Indian nationals.
Read the full explanation →Q41.Indian HistoryAsked in: UPSC Civil Services · CSE Prelims 2023, GS Paper IHard
- A.Kings employing women bodyguards
- B.Learned persons assembling in royal courts to discuss religious and philosophical matters
- C.Young girls keeping watch over agricultural fields and driving away birds and animals
- D.A king defeated in a battle committing ritual suicide by starving himself to death
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Correct answer: D. A king defeated in a battle committing ritual suicide by starving himself to death
Vadakkiruttal, literally "sitting facing the north", was the Sangam practice in which a defeated or dishonoured king sat facing north and fasted until death.
Read the full explanation →Q42.Indian HistoryAsked in: UPSC Civil Services · CSE Prelims 2021, GS Paper IHard
- A.Jain monks
- B.playwrights
- C.temple architects
- D.philosophers
Show answer
Correct answer: B. playwrights
All three wrote dramas in Sanskrit, and the question tests the names of classical playwrights after Kalidasa.
Read the full explanation →Q43.Environment & EcologyAsked in: UPSC Civil Services · CSE Prelims 2019, GS Paper IMedium
- A.1 and 2 only
- B.2 and 3 only
- C.1 and 3 only
- D.1, 2 and 3
Show answer
Correct answer: D. 1, 2 and 3
All three statements are correct. Methane hydrate, also called gas hydrate or "fire ice", is methane trapped inside a cage of frozen water molecules.
Read the full explanation →Q44.Environment & EcologyAsked in: UPSC Civil Services · CSE Prelims 2017, GS Paper IMedium
- A.1 only
- B.2 and 3 only
- C.1 and 3 only
- D.1, 2 and 3
Show answer
Correct answer: D. 1, 2 and 3
All three are listed in Schedule I of the Act, so none of them can be hunted except in the narrow cases the Act itself allows.
Read the full explanation →Q45.Indian HistoryAsked in: UPSC Civil Services · CSE Prelims 2016, GS Paper IEasy
- A.Georg Bühler
- B.James Prinsep
- C.Max Müller
- D.William Jones
Show answer
Correct answer: B. James Prinsep
In 1837 Prinsep, an officer of the East India Company's mint and secretary of the Asiatic Society of Bengal, deciphered the Brahmi script in which most of Ashoka's edicts are written.
Read the full explanation →Q46.Indian EconomyAsked in: UPSC Civil Services · CSE Prelims 2024, GS Paper IMedium
- A.1 only
- B.2 only
- C.Both 1 and 2
- D.Neither 1 nor 2
Show answer
Correct answer: A. 1 only
CSR spending must benefit society, not the company or its own staff, and the law does set a minimum amount to be spent.
Read the full explanation →Q47.Indian HistoryAsked in: UPSC Civil Services · CSE Prelims 2023, GS Paper IHard
- A.Only one
- B.Only two
- C.Only three
- D.None
Show answer
Correct answer: D. None
All four rose much later, between the 10th and 12th centuries, mostly as feudatories who broke away from the declining Western (Kalyani) Chalukyas or the Pratiharas.
Read the full explanation →Q48.General ScienceAsked in: UPSC Civil Services · CSE Prelims 2022, GS Paper IMedium
- A.1 and 2 only
- B.2 and 3 only
- C.1 and 3 only
- D.1, 2 and 3
Show answer
Correct answer: D. 1, 2 and 3
Biofilms form on almost any moist surface, including implants and food equipment, and they are notoriously hard to kill with antibiotics.
Read the full explanation →Q49.Indian HistoryAsked in: UPSC Civil Services · CSE Prelims 2021, GS Paper IMedium
- A.1 only
- B.2 only
- C.Both 1 and 2
- D.Neither 1 nor 2
Show answer
Correct answer: B. 2 only
The 1919 reforms gave no such right to all women, while the 1935 Act did reserve seats for women in the legislatures.
Read the full explanation →Q50.Indian EconomyAsked in: UPSC Civil Services · CSE Prelims 2020, GS Paper IMedium
- A.to reduce it by ₹1,00,000
- B.to increase it by ₹1,00,000
- C.to increase it by more than ₹1,00,000
- D.to leave it unchanged
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Correct answer: D. to leave it unchanged
Withdrawing cash only changes the form in which the money is held; the total stays the same.
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