Search Previous Year Questions

The correct answer is 2 only.

Statement 1: It is the intensity scale of an earthquake. (Incorrect)

The Richter scale is a magnitude scale, not an intensity scale.

• Magnitude measures the energy or "size" at the source of the earthquake.
• Intensity measures the observable effects, such as shaking and damage, at a specific location.
• Note: Intensity is typically measured using the Modified Mercalli Intensity (MMI) Scale, which uses Roman numerals (I to XII).

Statement 2: Richter indicates the amount of energy released during the earthquake. (Correct)

The Richter scale quantifies the magnitude of an earthquake, which is directly related to the total seismic energy released at its source (hypocenter).

• Because the scale is logarithmic, each whole number increase represents a tenfold increase in wave amplitude.
• In terms of energy, each whole number increase represents approximately 32 times more energy released.

The correct answer is Option 1 (1 only).

Key Points

1. "Alpine glaciers strip valleys of their soil, regolith and sediment to form glacial troughs." (Correct)

• As alpine (mountain) glaciers move through pre-existing V-shaped river valleys, they perform significant erosion.
• Through processes like plucking and abrasion, they strip away soil, regolith, and sediment, widening and deepening the valley into a U-shaped glacial trough.

2. "When the sea level is below the floor of a glacial trough, the seawater enters as the ice front recedes, creating a fiord." (Incorrect)

• A fiord (or fjord) is formed when the sea level is above the floor of the trough, causing the valley to be submerged or "drowned".
• If the sea level were below the floor of the trough, seawater could not enter the valley to inundate it. Typically, glaciers erode troughs to depths below current sea level, allowing the sea to flood them once the ice retreats.

The Correct Answer: Option 4) 2, 3 and 4

Key Points

Statement 1: "Mid-latitude deciduous forests consist largely of trees that drop their leaves during the summer season."

• Status: Incorrect
• Reasoning: In mid-latitudes (temperate regions), trees drop their leaves during the autumn/winter season to survive the cold and conserve moisture when water is frozen. Dropping leaves in the summer is a characteristic of Tropical deciduous forests (Monsoon forests), where trees shed leaves to survive the dry, hot summer months.

Statement 2: "Mid-latitude deciduous forests are native to eastern North America and Western Europe."

• Status: Correct
• Reasoning: These forests are primarily found in the moist, temperate regions of the Northern Hemisphere, specifically Eastern North America, Western and Central Europe, and Eastern Asia (China, Japan, and Korea).

Statement 3: "In Asia, the Mid-latitude deciduous forests occur as a belt between the boreal forest to the north and steppe lands to the south."

• Status: Correct
• Reasoning: This describes the transition of biomes. To the north lies the Boreal (Taiga/Coniferous) forest, which is colder. To the south, as the climate becomes drier and more continental, the forest gives way to the grasslands (Steppes).

Statement 4: "Beech, Hickory and Walnut are common examples of trees found in Mid-latitude deciduous forests."

• Status: Correct
• Reasoning: These are classic broadleaf deciduous species. Other common trees in this biome include Oak, Maple, Ash, Elm, and Birch.

The Correct Answer: Option 3) 2, 4, 1, 3 

Key Points

Permanent gases are those whose proportions remain nearly constant in the lower atmosphere. To solve this, we must look at their percentage by volume (concentration):

1. Neon (Ne): ~0.0018% (approx. 18 parts per million)
2. Helium (He): ~0.0005% (approx. 5 parts per million)
3. Xenon (Xe): ~0.000009% (approx. 0.09 parts per million) — Note: Some textbooks list it as 0.00009%.
4. Hydrogen (H₂): ~0.00005% (approx. 0.5 parts per million)

Arranging in Ascending Order (Least to Most):

Based on the standard data used in most competitive exams (like UPSC/NCERT), the ranking from lowest concentration to highest is:

• Lowest: Hydrogen (2) — 0.00005%
• Second Lowest: Xenon (4) — 0.000009% to 0.00009%
• Second Highest: Helium (1) — 0.0005%
• Highest: Neon (3) — 0.0018%

Sequence: 2 (Hydrogen) $\rightarrow$ 4 (Xenon) $\rightarrow$ 1 (Helium) $\rightarrow$ 3 (Neon)

Result: 2, 4, 1, 3

The Correct Answer: Option 4) 1, 2 and 3

Detailed Analysis of Factors:

1. Latitudinal Variation of Atmospheric Heating:

• Status: Correct.
• Reasoning: The Sun heats the Earth unevenly; the equator receives more direct sunlight than the poles. This creates temperature and pressure differences (Low pressure at the equator, High pressure at the poles), which act as the primary "engine" for wind movement.

2. The Distribution of Continents and Oceans:

• Status: Correct.
• Reasoning: Land and water heat and cool at different rates. This differential heating breaks the uniform pressure belts into cells and modifies the direction and strength of winds as they pass over landmasses versus vast oceans.

3. The Rotation of the Earth:

• Status: Correct.
• Reasoning: As the Earth rotates, it creates the Coriolis Effect, which deflects winds to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. Without rotation, winds would blow in a simple straight line from high to low pressure; rotation creates the characteristic "curved" global wind belts.

The Correct Answer: Option 3) Both 1 and 2

Key Points

Statement 1: "It has a role to play in the stability and instability in the air."

• Status: Correct
• Reasoning: Water vapour is the source of all condensation and precipitation. When water vapour condenses, it releases latent heat of condensation, which provides energy to the atmosphere. This process is a primary driver of atmospheric instability, leading to the formation of clouds, storms, and vertical air movements. Conversely, dry air tends to be more stable.

Statement 2: "It acts like a blanket allowing the earth to neither become too cold nor too hot."

• Status: Correct
• Reasoning: Water vapour is a potent greenhouse gas. It absorbs a portion of the incoming solar radiation (insolation) from the Sun and, more importantly, traps the long-wave terrestrial radiation (heat) emitted by the Earth's surface. By doing so, it prevents heat from escaping instantly into space at night, maintaining a habitable temperature on the planet.

Correct answer: Option 3, as 1, 2 and 3 are correctly matched.

Key Points

I. Tropical and dry wet : Winter dry season

• Status: Correctly Matched
• Reasoning: This is also known as the Savanna climate (Aw). It is characterized by a distinct wet season during the high-sun period (summer) and a pronounced dry season during the low-sun period (winter).

II. Mid-latitude steppe : Mid-latitude semi-arid or dry

• Status: Correctly Matched
• Reasoning: Steppe climates are transitional zones between deserts and humid climates. The "Mid-latitude" variant (BSk) is specifically found in the interiors of continents and is defined as being semi-arid or dry, receiving low and often unpredictable precipitation.

III. Humid sub-tropical : No dry season, warm summer

• Status: Correctly Matched
• Reasoning: Often found on the eastern margins of continents (like the SE United States or East China), the Humid Sub-tropical climate (Cfa) has rainfall distributed throughout the year (no dry season) and experiences warm to hot summers.

IV. Marine west coast : No dry season, severely cold summer

• Status: Incorrectly Matched
• Reasoning: While it is true that the Marine West Coast climate (Cfb) typically has no dry season due to consistent maritime influence, it is characterized by mild or cool summers, not "severely cold" ones. "Severely cold" summers are typical of Subarctic (Dfc) or Tundra (ET) climates.

Option 3) Cold climate with dry winters

Detailed Analysis of Characteristics

This climate type is often categorized as the Continental (Dw) climate in the Köppen system, predominantly found in Northeastern Asia (Siberia and parts of China).

1. "The annual precipitation is low and is around 15 cm."

• Reasoning: In very cold continental regions, the air is too cold to hold much moisture. While these aren't technically "deserts," the absolute humidity is so low that the total annual liquid equivalent of precipitation (mostly snow) often falls between 12–25 cm.

2. "Development of pronounced winter anticyclones and their weakening in summer sets in monsoon-like reversal of wind."

• Reasoning: This is the most defining feature of this climate. In winter, a massive high-pressure system (the Siberian Anticyclone) develops over the cold landmass, blowing dry, freezing air outward. In summer, the land heats up, the high pressure weakens/disappears, and a "monsoon-like" reversal occurs as slightly moister air is drawn in from the oceans.

3. "Polewards, summer temperatures are low."

• Reasoning: As you move further north (polewards) within this climate zone, the growing season becomes shorter and the intensity of the summer heat diminishes significantly, eventually transitioning into the Subarctic and Tundra regions.

Why Other Options are Incorrect

• Subtropical Steppe: These are semi-arid regions (like the fringes of the Sahara or parts of Rajasthan) that are much warmer and do not experience the massive continental winter anticyclones described here.
• Humid Sub-tropical: These regions (like Florida or East China) have high annual rainfall (often over 100 cm), not 15 cm.
• Tundra Climate: While the temperature and precipitation are low, the Tundra does not exhibit the specific "monsoon-like reversal" caused by massive continental landmass heating/cooling to the same extent as the Cold Continental (D) climates.

The Correct Answer: Option 3) Both 1 and 2

Key Points

Statement 1: "Cotton textile industry has, over time, spread to other parts of the country, beyond Gujarat and Maharashtra."

• Status: Correct
• Reasoning: Initially, the industry was concentrated in Mumbai and Ahmedabad due to the availability of raw cotton, market access, and humid climate. Over time, factors like the development of irrigation, availability of cheap labor, and better transportation led to its expansion into other states like Tamil Nadu (Coimbatore is known as the "Manchester of South India"), Uttar Pradesh (Kanpur), West Bengal, and Punjab.

Statement 2: "Raw cotton is not a weight-losing raw material."

• Status: Correct
• Reasoning: In industrial geography, a "weight-losing" material is one that significantly reduces in weight during processing (like sugarcane into sugar or iron ore into steel). Cotton, however, is a "pure" raw material because the weight of the raw cotton is almost equal to the weight of the finished yarn. Because it doesn't lose weight, cotton textile mills can be located near the raw material source or near the final market without high transportation cost penalties.

The Correct Answer: Option 3) Malwa Plateau

Key Points

1. Malwa Plateau (Correct)

• Reasoning: Indore is situated on the Malwa Plateau in the western part of Madhya Pradesh. This plateau is characterized by fertile black soil (Regur), which is excellent for cotton and soybean cultivation. Indore is known as the "Commercial Capital" of the state and is the largest city in this region.

2. Bundelkhand

• Status: Incorrect
• Reasoning: This region is located in the northern part of Madhya Pradesh and parts of southern Uttar Pradesh. It includes districts such as Sagar, Chhatarpur, Tikamgarh, and Panna. Its topography is distinct from the western Malwa Plateau.

3. Mahakoshal

• Status: Incorrect
• Reasoning: Mahakoshal is a region in central-eastern Madhya Pradesh, primarily centered around the Jabalpur division. It lies to the east of the Malwa region and is historically and culturally distinct.

4. Nimar Region

• Status: Incorrect
• Reasoning: Nimar lies to the south of the Malwa Plateau. It is divided into East Nimar (Khandwa) and West Nimar (Khargone). While Indore serves as a gateway to this region, it is physically located on the higher elevation of the Malwa Plateau rather than in the Nimar plains.