Previous Year UPSC Questions

Explanation

Statement 1 is correct: The distinctive red colour is one of the key characteristics of laterite soils. It appears red due to the high concentration of iron oxides. In tropical climates, heavy rainfall causes intense leaching, washing away silica and other bases while leaving behind iron and aluminum oxides, which give the soil its distinctive red color.

Statement 2 incorrect: Laterite soils are poor in nitrogen, phosphorus, and potash (potassium). The intense leaching caused by heavy rainfall in tropical regions washes away these soluble nutrients.

Statement 3 is incorrect: Laterite soils are primarily found in the humid tropical regions of India, such as the Western Ghats, parts of Eastern Ghats, and some northeastern states. Rajasthan and Uttar Pradesh (UP) have a drier climate which is not suitable for the formation of laterite soils.

Statement 4 is correct: The agro-climatic conditions of laterite soils support the cultivation of crops such as tapioca, cashew nuts, groundnut, coffee, and rubber. These crops are well-adapted to the moisture-retaining and nutrient-poor nature of laterite soils.

Explanation

Statement 1 is incorrect: The Gondwana beds are primarily famous for containing coal reserves, with nearly 98% of India’s coal reserves found in them. They are not significant for natural gas reserves. Natural gas in India is more commonly associated with other formations such as sedimentary basins such as the Cambay Basin or the Krishna-Godavari Basin.

Statement 2 is correct: Kodarma in Jharkhand is a well-known region for mica production, which has been an important mineral in India’s mineral resources. Mica is found abundantly here and Kodarma is often referred to as the "mica capital" of India.

Statement 3 is incorrect: The Dharwar system of rocks is not known for petroleum production. The Dharwar rocks are particularly valuable for metallic minerals like high-grade iron ore, manganese, and copper. Petroleum is not found in the Dharwar rock system but in other formations like the Cambay Basin or the Rajasthan Basin.

Explanation

Factors of The Dynamic Changes of the Earth:

Electromagnetic radiation from the sun, particularly in the form of solar energy, drives atmospheric and surface processes such as weathering, erosion, and the water cycle. These processes contribute to the continuous reshaping of Earth’s surface. Geothermal energy originates from Earth’s internal heat, which fuels volcanic activity and drives plate tectonics. These internal processes lead to the formation of new landforms, mountain building, and seafloor spreading, all of which dynamically alter Earth’s surface. Gravity influences the movement of water, sediments, and tectonic plates. It plays a crucial role in processes like mass wasting (landslides), river flow, and glacial movement which contributes to the dynamic changes on Earth’s surface. The movement of tectonic plates leads to continental drift, mountain formation, earthquakes, and volcanic activity. Rotation of the Earth causes the Coriolis effect, which deflects moving air and water, influencing weather patterns, ocean currents, and thus affecting erosion and deposition. It also contributes to the tides. Revolution of the Earth around the sun, combined with its axial tilt, causes the seasons. Seasonal variations in temperature and precipitation influence weathering, erosion, and the activity of living organisms, all of which contribute to surface changes. Thus, all of the above are responsible for bringing dynamic changes on the surface of the earth. Since all the listed factors contribute to dynamic changes, the correct answer is option (d).

Explanation

Bagasse and Molasses:

Introduction Uses Bagasse is the remnant left after extracting the juice of the sugarcane or sorghum is known as bagasse. It is a dry pulpy fibrous material. It is used for the generation of heat energy and electricity. Ethanol produced from it is also used as a popular fuel in some countries. It substitutes wood to produce pulp, paper, and board. As a cattle feed when mixed with molasses and enzymes and then fermenting. Molasses is the thick syrup that results from the refining of sugarcane or sugar beets into sugar. It contains a good amount of Vitamin B6 and minerals like calcium, manganese, iron and magnesium. Sweetening and flavouring foods. In the production of fine commercial brown sugar. In baking and cooking. Producing ethanol and is the prime ingredient in the distillation of few alcoholic beverages. As a cattle feed. Statements 1 and 3 are correct: Bagasse can be used for the generation of heat energy and electricity. Molasses can be used for the production of ethanol and it is also used as the ingredient in the distillation of a few alcoholic beverages.

Statement 2 is incorrect: Molasses is not used for the production of chemical fertilizers. Synthetic fertilizers are typically made from chemical compounds like ammonia, urea, and phosphates, which are derived from petrochemicals or mineral sources. Molasses is rich in sugars and organic matter which make it unsuitable for the production of synthetic fertilizers.

Explanation

Statement 1 is correct: Inflation typically benefits debtors because it erodes the real value of money. When inflation rises, the value of the currency decreases, meaning the amount of money a debtor repays is worth less in real terms than when it was borrowed. For example, if a person took a loan of 1,00,000 and inflation rises by 10%, they can repay the loan in currency that is worth less, effectively reducing their real debt burden.

Statement 2 is incorrect: Inflation harms bondholders, especially those holding fixed-rate bonds. When inflation rises, the real return on bonds decreases because the bondholder receives a fixed interest payment. Inflation erodes the purchasing power of the bond’s future payments. For example, if a bond pays 5,000 per year and inflation increases by 5%, the real purchasing power of those 5,000 payments is effectively reduced.

Explanation

Budget Deficit refers to a situation where total expenditure exceeds the total revenue. A tool for raising money to create a budget deficit is known as deficit financing.

Option (a) is incorrect: Repaying public debt does not directly lead to inflation. The repayment involves transferring money to creditors as it doesn’t affect the overall money supply in the economy.

Option (b) is incorrect: Borrowing from the public means the government is taking funds from the private sector. While this may have some economic effects (like crowding out private investment), it doesn’t increase the money supply directly and is thus not highly inflationary. The funds are merely being re-distributed within the economy.

Option (c) is incorrect: Borrowing from banks is inflationary, but to a lesser extent than creating new money. Borrowing from banks usually involves financial institutions lending money that they have obtained from deposits. This could potentially affect the money supply, but not to the extent of creating new money, as the central bank can manage the liquidity and banking reserves.

Option (d) is correct: When a government prints new money to finance its deficit it directly increases the money supply. This can lead to excessive inflation if the increase in money supply outpaces the growth in the supply of goods and services in the economy. It is a direct cause of inflation because it adds to the overall demand without a corresponding increase in supply.

Explanation

An optical illusion is characterized by visually perceived images that differ from object than reality. The information that is gathered by the eye is processed in the brain that gives a perception that does not tally with a physical measurement of the stimulus source.

Statement 1 is correct: There are no known objects of a similar size as the sun (or moon) when it is high in the sky. The sun, however, appears even larger when it is low in the sky because we can see distant objects near the horizon that we know to be large. Thus, the size of the sun at dusk is a visual illusion.

Statement 2 is correct: There are many different colours in light. Red is the colour that moves the farthest out of all of those others. As the sun sets, crimson (deep, rich red colour) is the final hue to be seen. Red is the last colour to appear when the other colours begin to fade. Therefore, the colour of the sun at dawn is due to optical illusion.

Statement 3 is incorrect: Moon being visible at dawn is not an optical illusion as the moon is visible somewhere in the sky at dawn during the entire half of the cycle of phases from Full Moon to just before New Moon.

Statement 4 is correct: Light is constantly emitted by stars. Before reaching our sight, this light passes through a number of layers of the earth’s atmosphere. Because different layers of atmosphere have different refractive indices, stars appear to be blinking/twinkling.

Statement 5 is incorrect: The Polestar (Pole Star or North Star) is visible because of its alignment with Earth’s rotational axis, not due to any optical effect.

Explanation

In 1942, the British Government sent the Cripps Mission to India to secure Indian support for Britain’s war effort during World War II. The Cripps Proposals offered India dominion status after the war and promised a constituent assembly to frame a new constitution, but these were largely seen as insufficient and vague. The Congress (led by Mahatma Gandhi) demanded immediate independence and rejected the Cripps Proposals. When the British government failed to provide clear and concrete plans for independence, Gandhi called for a mass movement of civil disobedience, demanding that the British "Quit India".

Explanation

Statement 1 is correct: The Also known as " God Particle" is associated with the Higgs field, which permeates the universe. Elementary particles acquire mass through their interaction with this field. Without the Higgs mechanism, particles would remain massless, preventing the formation of atoms and, consequently, the existence of matter as we know it. This discovery confirms the Standard Model’s explanation of mass acquisition.

Statement 2 is incorrect: The Part of Invisible energy field, if Higgs field doesn’t ok provide mass to particles then there will be no gravity and no life. is not a key item that will open the way for teleportation but it will certainly help to understand mass, time and travel in time and space.

Statement 3 is incorrect: In the near or far future, the Higgs Boson may help us to create an unbelievable energy source which can pave the way for better fuels for our Nuclear missions but at present, direct connection between detection of Higgs Bosons and creation of better fuels for nuclear missions is not established.

Explanation

Inflation is the general rise in prices of goods and services within a particular economy wherein, the purchasing power of consumers decreases, and the value of the cash holdings erode. Inflation measures the average price change in a basket of commodities and services over time. Some causes of inflation include increase in demand, reduction in supply, demand-supply gap, excess circulation of money, increase in input costs, devaluation of currency, rise in wages, etc.

Statement 1 is correct: When the money supply in the economy increases the purchasing power of people increases leading to increased demand for goods and services. If this demand surpasses the supply the prices rise causing demand-pull inflation. Example: Post-COVID monetary easing by central banks led to global inflationary trends.

Statement 2 is correct: If the economy’s overall production of goods and services falls (aggregate supply decreases) and demand remains the same or increases then the prices will be pushed upward causing inflation. This can happen due to factors like supply chain disruptions, natural disasters, or decreased productivity.

Statement 3 is correct: "Effective demand" refers to demand that is backed by the ability to pay. If there’s an increase in demand for goods and services (due to factors like rising incomes, consumer confidence, or government spending) and supply doesn’t increase at the same rate then theprices will rise.