World and Physical Geography Archives

491. Which one among the following has the highest concentration in the

Which one among the following has the highest concentration in the atmosphere?

[amp_mcq option1=”Argon” option2=”Carbon dioxide” option3=”Neon” option4=”Methane” correct=”option1″]

This question was previously asked in

UPSC Geoscientist – 2021

The correct answer is Argon.

While Nitrogen (~78%) and Oxygen (~21%) are the most abundant gases in the atmosphere, among the options provided, Argon has the highest concentration, making up about 0.93% of the dry atmosphere.

The concentrations of the other gases listed are significantly lower: Carbon dioxide is approximately 0.04%, Neon is about 0.0018%, and Methane is around 0.00018%.

492. Global climates are classified on the basis of:

Global climates are classified on the basis of:

[amp_mcq option1=”annual averages in temperature and precipitation only.” option2=”annual averages in temperature only.” option3=”seasonal variations in temperature and precipitation only.” option4=”annual averages and seasonal variations in temperature and precipitation.” correct=”option4″]

This question was previously asked in

UPSC Geoscientist – 2020

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Global climate classification systems, such as the widely used Köppen system, are based on analyzing patterns of temperature and precipitation. They consider not just the annual average values but also the seasonal distribution and variations of temperature and precipitation (e.g., presence or absence of a dry season, hot summer or cold winter, etc.). These seasonal patterns are crucial for defining distinct climate types and their associated vegetation.

Temperature and precipitation are the two most fundamental elements used to define climate. Their average values and seasonal cycles determine the types of ecosystems that can thrive in a region.

Other factors like humidity, wind, and sunshine are also components of climate, but temperature and precipitation are considered the primary variables for defining major climate zones and classification systems.

493. Which one of the following countries is the top producer of cereals in

Which one of the following countries is the top producer of cereals in the world?

[amp_mcq option1=”USA” option2=”Russia” option3=”India” option4=”China” correct=”option4″]

This question was previously asked in

UPSC Geoscientist – 2020

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China is the world’s largest producer of cereals overall. It is the leading producer of rice and wheat, two of the most widely consumed cereals globally. While countries like the USA (maize) and India (rice, wheat) are also major cereal producers, China’s combined production volume across various cereals ranks it as the top producer.

Cereals are staple food crops and include wheat, rice, maize (corn), barley, sorghum, oats, etc. Global agricultural production statistics are compiled by organizations like the Food and Agriculture Organization (FAO) of the United Nations.

The ranking of countries in cereal production can vary slightly year to year based on harvest outcomes, but China consistently remains at the top or among the top producers. The USA is the largest producer of maize, and India is a major producer of rice and wheat.

494. Insolation percentage received on Pole as compared to Equator is

Insolation percentage received on Pole as compared to Equator is approximately:

[amp_mcq option1=”42 percent.” option2=”68 percent.” option3=”33 percent.” option4=”47 percent.” correct=”option3″]

This question was previously asked in

UPSC Geoscientist – 2020

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Due to the angle of the Earth’s tilt and the curvature of the Earth, the sun’s rays strike the poles at a much more oblique angle compared to the equator. This oblique angle means the solar radiation is spread over a larger area and passes through a thicker layer of the atmosphere, where it is absorbed, scattered, and reflected more significantly. On an annual average basis, the insolation received at the poles is significantly less than at the equator, typically around 30-40% of the equatorial value. 33% is a commonly cited approximation for the annual average insolation received at the poles compared to the equator.

The amount of solar radiation (insolation) received on the Earth’s surface varies geographically and seasonally due to factors like the angle of incidence of sunlight, atmospheric thickness, duration of daylight, and albedo.

While poles receive very low annual average insolation, they experience extreme seasonal variations, including periods of 24-hour daylight or darkness. The equator, in contrast, receives relatively consistent high levels of insolation throughout the year.

495. The salt in sea water comes from:

The salt in sea water comes from:

[amp_mcq option1=”rain.” option2=”chemical exchange between sea water and its substratum as well as hydrothermal emissions.” option3=”evaporation of water and concentration of dissolved salts.” option4=”mixing of different density waters during natural warm and cold current movements.” correct=”option2″]

This question was previously asked in

UPSC Geoscientist – 2020

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The salt in sea water primarily originates from the weathering and erosion of rocks on land, with rivers carrying dissolved minerals and salts to the ocean. Additionally, significant contributions come from chemical reactions between seawater and the ocean floor (rock-water interactions) and from hydrothermal emissions at mid-ocean ridges and other volcanic activity, which release dissolved minerals into the water.

The salinity of the ocean is a result of geological processes involving the dissolution of minerals from rocks on land and the seabed, transported by rivers and released through volcanic and hydrothermal activity.

While evaporation concentrates the existing salts, it is not the *source* of the salts themselves. Rain contains very little dissolved salt. Mixing of water masses influences temperature and currents but doesn’t create the salts. Therefore, chemical exchange with the substratum and hydrothermal vents are key processes, alongside riverine input, that contribute to the ocean’s salt content.

496. The edge effect at the contact of continental fresh water and sea wate

The edge effect at the contact of continental fresh water and sea water results in:

[amp_mcq option1=”non-deposition of sediments due to turbulence.” option2=”deposition of sand due to fall in system energy.” option3=”deposition of organic matter due to density difference.” option4=”flocculation of clays resulting in formation of mud deposits.” correct=”option4″]

This question was previously asked in

UPSC Geoscientist – 2020

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When freshwater mixes with saltwater, especially in estuaries, the dissolved salts (ions) in the saltwater neutralize the negative charges on clay particles carried by the freshwater. This neutralization reduces the electrostatic repulsion between clay particles, causing them to clump together (flocculate) and settle out of suspension, forming mud deposits.

Flocculation of clay particles is a key process occurring at the salt-freshwater interface in estuaries, driven by changes in salinity.

This flocculation and subsequent deposition of fine sediments are major factors contributing to the formation of muddy bottoms, tidal flats, and salt marshes characteristic of estuarine environments. The mixing zone, where this occurs, is often referred to as the “turbidity maximum.”

497. Which one of the following countries shares the territorial boundary w

Which one of the following countries shares the territorial boundary with both Russia and Ukraine ?

[amp_mcq option1=”Estonia” option2=”Latvia” option3=”Belarus” option4=”Poland” correct=”option3″]

This question was previously asked in

UPSC CDS-2 – 2024

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Looking at the geography of Eastern Europe, Belarus shares a land border with both Russia to the north and east, and Ukraine to the south. While Poland also borders Ukraine and Russia (via the Kaliningrad exclave), Belarus shares extensive direct land borders with both contiguous Russia and Ukraine.

Belarus is strategically located between Russia and Ukraine, sharing borders with both.

Other countries bordering Ukraine include Poland, Slovakia, Hungary, Romania, and Moldova. Other countries bordering the main territory of Russia include Norway, Finland, Estonia, Latvia, Lithuania, Poland (via Kaliningrad), Belarus, Georgia, Azerbaijan, Kazakhstan, China, Mongolia, and North Korea.

498. With reference to the continent of ‘Antarctica’ which of the following

With reference to the continent of ‘Antarctica’ which of the following statements are correct ?

1. It is larger than Europe in terms of area.
2. It has the highest average elevation as compared to all other continents.
3. Mt. Ross is the highest peak of this continent.
4. Waters of the Southern Ocean (West Wind Drift) move in an anticlockwise direction around it.

Select the answer using the code given below :

[amp_mcq option1=”1 and 2 only” option2=”1 and 3 only” option3=”1, 2 and 3″ option4=”2, 3 and 4″ correct=”option1″]

This question was previously asked in

UPSC CDS-2 – 2024

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Statement 1 is correct. Antarctica covers an area of approximately 14.2 million square kilometers (including ice shelves), making it the fifth-largest continent. Europe’s area is about 10.18 million square kilometers. Thus, Antarctica is larger than Europe.

Statement 2 is correct. Due to the immense ice sheet covering most of the landmass, Antarctica has the highest average elevation of any continent, estimated to be around 2,500 meters above sea level. This is significantly higher than the average elevation of other continents.

Statement 3 is incorrect. While Mount Erebus (often associated with Mount Ross on Ross Island) is a prominent and active volcano in Antarctica, it is not the highest peak of the continent. The highest peak is Vinson Massif, part of the Ellsworth Mountains, with an elevation of 4,892 meters.

Statement 4 is incorrect. The Southern Ocean waters around Antarctica are dominated by the Antarctic Circumpolar Current (ACC), also known as the West Wind Drift. This current flows predominantly from west to east around the continent, driven by the prevailing westerly winds. This flow is clockwise when viewed from above the South Pole or from west to east on a standard map projection, not anticlockwise.

– Antarctica is larger than Europe.
– Antarctica has the highest average elevation due to its ice sheet.
– Vinson Massif is the highest peak, not Mt. Ross (Mt. Erebus).
– The Antarctic Circumpolar Current flows from west to east (clockwise when viewed from above the South Pole).

Antarctica is the coldest, driest, and windiest continent. It is also the continent with the highest average elevation. Around 98% of Antarctica is covered by ice.

499. Which of the following statements regarding River Rhine is/are correct

Which of the following statements regarding River Rhine is/are correct ?

1. Rhine River is an important pathway for industrial activity in northern Germany.
2. Port of Rotterdam is located at the mouth of the Rhine River.

Select the answer using the code given below :

[amp_mcq option1=”1 only” option2=”2 only” option3=”Both 1 and 2″ option4=”Neither 1 nor 2″ correct=”option3″]

This question was previously asked in

UPSC CDS-2 – 2024

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Statement 1 is correct. The River Rhine is a crucial waterway for industrial transport in Germany, particularly connecting the industrial heartland in the Ruhr region (part of Western/North-Western Germany) to the North Sea. It serves as a major route for transporting raw materials and finished goods. While “northern Germany” might not be the most precise description (Western Germany is key), the industrial importance of the Rhine extends into areas considered northern parts of western Germany.

Statement 2 is correct. The Port of Rotterdam in the Netherlands is located at the delta of the Rhine and Meuse rivers, where they flow into the North Sea. It is one of the busiest ports in the world and serves as a major gateway for goods transported via the Rhine waterway into the European interior, especially Germany.

– The Rhine is a vital inland waterway for industry in Germany.
– The Port of Rotterdam is situated at the mouth of the Rhine River delta.

The Rhine flows through Switzerland, Liechtenstein, Austria, Germany, France, and the Netherlands. It is one of the longest and most important rivers in Europe for navigation and trade.

500. Which one of the following statements regarding S-waves is not corre

Which one of the following statements regarding S-waves is not correct ?

[amp_mcq option1=”S-waves are slower than P-waves.” option2=”During an earthquake S-waves are less destructive to structures like buildings and highway overpasses.” option3=”S-waves can travel only through solids and cannot travel through the Earth’s outer core.” option4=”Seismologists have concluded that the Earth’s outer core must be liquid or fluid.” correct=”option2″]

This question was previously asked in

UPSC CDS-2 – 2024

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Statement A is correct. P-waves (primary waves) are compressional waves and travel faster through the Earth’s layers than S-waves (secondary waves), which are shear waves. P-waves are the first to arrive at a seismic station.

Statement B is incorrect. S-waves cause particles to move perpendicular to the direction of wave propagation, resulting in a shearing motion. This sideways and vertical shaking motion is generally more damaging and destructive to structures like buildings, bridges, and overpasses compared to the push-pull motion of P-waves.

Statement C is correct. S-waves can only travel through solid materials because they rely on the rigidity of the medium to transmit the shear force. Liquids and gases have no rigidity, so S-waves cannot propagate through them. The Earth’s outer core is known to be liquid.

Statement D is correct. The observation that S-waves generated by earthquakes do not pass through the Earth’s outer core is the primary seismological evidence indicating that the outer core is in a liquid or fluid state.

– S-waves are slower than P-waves.
– S-waves are generally more destructive than P-waves due to their shearing motion.
– S-waves cannot travel through liquids.
– The absence of S-waves in the outer core indicates it is liquid.

Seismology, the study of earthquakes and seismic waves, is the main tool used by geophysicists to understand the internal structure and composition of the Earth. P-waves can travel through solids, liquids, and gases, albeit at different speeds.