World and Physical Geography

461. Which one of the following countries is landlocked?

Which one of the following countries is landlocked?

[amp_mcq option1=”Paraguay” option2=”Uruguay” option3=”Suriname” option4=”Colombia” correct=”option1″]

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Paraguay is a landlocked country among the given options.
– A landlocked country is a sovereign state that does not have territory connected to an ocean or whose coastlines lie on endorheic basins.
– Paraguay is situated in central South America and is bordered by Argentina, Brazil, and Bolivia, with no direct access to the sea.
Uruguay has a coastline on the Atlantic Ocean. Suriname has a coastline on the Atlantic Ocean. Colombia has coastlines on both the Caribbean Sea and the Pacific Ocean. Therefore, Uruguay, Suriname, and Colombia are not landlocked. Bolivia is another landlocked country in South America.

462. Which one of the following zones of atmosphere is the farthest from th

Which one of the following zones of atmosphere is the farthest from the earth surface?

[amp_mcq option1=”Stratosphere” option2=”Mesosphere” option3=”Ionosphere” option4=”Troposphere” correct=”option3″]

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The Ionosphere is the farthest zone from the Earth’s surface among the options provided.
The layers of the atmosphere from Earth’s surface upwards are Troposphere, Stratosphere, Mesosphere, Thermosphere, and Exosphere. The Ionosphere is not a distinct layer but a region within the Thermosphere (and parts of the Mesosphere and Exosphere) characterized by ionization due to solar radiation. Among the given options (Stratosphere, Mesosphere, Ionosphere, Troposphere), the Ionosphere is situated highest above the Earth’s surface, being part of the Thermosphere which is above the Mesosphere.
The exosphere is the outermost layer, extending into space. The Thermosphere, where the Ionosphere is located, is known for its high temperatures (though not felt as heat due to low density) and is where phenomena like the aurora occur.

463. The uplift mechanism that takes place when lighter warm moist air mass

The uplift mechanism that takes place when lighter warm moist air mass rises after encountering a colder and denser air mass causes

[amp_mcq option1=”conventional precipitation” option2=”frontal precipitation” option3=”cyclonic precipitation” option4=”orogenic precipitation” correct=”option2″]

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The correct answer is (B) frontal precipitation.
Frontal precipitation occurs when a warmer, lighter air mass is forced to rise over a colder, denser air mass along a weather front. As the warm, moist air rises, it cools, condenses, and forms precipitation. This uplift mechanism is characteristic of frontal systems like warm fronts and cold fronts.
Conventional precipitation results from the uplift of warm, moist air due to surface heating, often leading to thunderstorms. Cyclonic precipitation is associated with low-pressure systems (cyclones), which often involve frontal systems but the term “cyclonic” refers to the overall system’s circulation. Orogenic precipitation occurs when air is forced to rise over mountains (orographic lift). The description specifically matches the interaction of distinct air masses at a front.

464. Deserts are generally located at

Deserts are generally located at

[amp_mcq option1=”Equatorial region” option2=”Polar region” option3=”about 30° latitude” option4=”about 65° latitude” correct=”option3″]

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The correct answer is (C) about 30° latitude.
Many of the world’s largest deserts are located in the subtropical high-pressure belts, which are typically found around 30° North and South latitudes. The descending air in these regions inhibits cloud formation and precipitation, leading to arid conditions.
Examples of deserts located near 30° latitude include the Sahara Desert (North Africa), Arabian Desert (Middle East), Great Sandy Desert (Australia), and Atacama Desert (South America). While polar regions are also technically deserts (due to low precipitation), the vast subtropical deserts are characteristically found around these latitudes.

465. Which one of the following events has not been attributed to El Niño

Which one of the following events has not been attributed to El Niño during early 1980s?

[amp_mcq option1=”The warmest winter in the Eastern US during the last 25 years” option2=”Drought in Southeast Africa, Australia, New Zealand and Southeast Asia” option3=”Prolific growth of coral reefs in the Pacific Ocean” option4=”Increased incidents of bubonic plague in Southwestern United States” correct=”option3″]

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El Niño is associated with warming of the central and eastern tropical Pacific Ocean waters. This warming typically leads to coral bleaching, a stress response where corals expel their symbiotic algae (zooxanthellae), causing them to turn white and often die if the stress is prolonged. Therefore, prolific growth of coral reefs is not an effect attributed to El Niño; rather, coral bleaching and potential mortality are common consequences of the associated ocean warming. The early 1980s (specifically 1982-83) saw a significant El Niño event with widespread climate impacts.
– El Niño warms ocean surface waters in the Pacific.
– Ocean warming causes coral bleaching, not prolific growth.
– Droughts in certain regions (like Australia, parts of Africa, Southeast Asia) and altered temperature patterns are typical El Niño effects.
El Niño-Southern Oscillation (ENSO) is a major climate pattern involving variations in the temperature of the surface of the tropical eastern Pacific Ocean and in the air pressure over the tropical western Pacific. It has three phases: El Niño (warm phase), La Niña (cool phase), and Neutral. The 1982-83 El Niño event was particularly strong and well-documented for its global impacts.

466. Dew point temperature represents that

Dew point temperature represents that

[amp_mcq option1=”thin layer of air near the ground surface has become cold enough to condensate” option2=”there is thorough mixing of air” option3=”evaporation has exceeded condensation” option4=”the night temperature is warm” correct=”option1″]

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The dew point temperature is defined as the temperature to which air must be cooled at constant pressure and humidity for water vapor to condense into liquid water (dew). When the air near the ground surface cools down to this temperature, it becomes saturated, and any further cooling leads to condensation, forming dew.
– Dew point is the temperature of saturation for water vapor.
– Condensation occurs when air cools to or below the dew point.
– Dew forms when surface air cools to the dew point temperature.
Relative humidity is 100% at the dew point. The difference between the air temperature and the dew point indicates how close the air is to saturation. A smaller difference means higher relative humidity.

467. Which one of the following statements about North-facing slopes and So

Which one of the following statements about North-facing slopes and South-facing slopes in the Northern Hemisphere is not correct?

[amp_mcq option1=”North-facing slopes are snow covered while South-facing slopes are bare.” option2=”North-facing slopes get less intense radiation as compared to South-facing slopes.” option3=”Snow on North-facing slopes is found at a lower altitude than South-facing slopes.” option4=”Tree line characteristics on North-facing slopes and South-facing slopes are similar.” correct=”option4″]

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In the Northern Hemisphere, South-facing slopes receive more direct solar radiation than North-facing slopes. This difference in insolation leads to significant differences in temperature, soil moisture, snow cover duration, and ultimately, vegetation patterns and species distribution. The tree line, which is the upper limit of tree growth limited by cold temperatures and snow duration, is typically found at a lower altitude on colder, wetter North-facing slopes compared to warmer, drier South-facing slopes. Therefore, the tree line characteristics are generally *not* similar on North-facing and South-facing slopes.
– Solar radiation intensity (B) is higher on South-facing slopes in the Northern Hemisphere.
– Lower insolation on North-facing slopes leads to lower temperatures and longer-lasting snow cover (A), often resulting in snow being present at lower altitudes (C).
– These environmental differences (temperature, moisture, snow) drive differences in plant communities and ecological boundaries like the tree line.
This phenomenon of ecological differences based on aspect (the direction a slope faces) is well-studied and results in distinct microclimates and vegetation zones on opposite-facing slopes within the same mountain range or area. The effect is reversed in the Southern Hemisphere, where North-facing slopes receive more direct solar radiation.

468. Which one of the following is not correct in the context of daytime he

Which one of the following is not correct in the context of daytime heating experienced on the Earth?

[amp_mcq option1=”The highest daytime temperatures usually occur several hours after the time of maximum solar input” option2=”Equilibrium between incoming and outgoing radiation occurs about an hour and a half after sunset” option3=”The extent of daily lag in maximum temperature varies” option4=”Presence of vegetation cover reduces the maximum temperature” correct=”option2″]

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Equilibrium between incoming and outgoing radiation, leading to maximum temperature, occurs when the rate of energy gain equals the rate of energy loss. During the day, incoming solar radiation exceeds outgoing radiation. Maximum temperature is reached when the net radiation balance becomes zero or slightly negative, typically in the mid-afternoon, several hours *after* solar noon (maximum solar input). After sunset, there is no incoming solar radiation, and the Earth continues to lose radiation, so outgoing radiation significantly exceeds incoming (zero). Equilibrium (net radiation=0) does *not* occur after sunset; the surface cools.
– There is a lag between the time of maximum solar radiation input (solar noon) and the time of maximum daily temperature due to the heat capacity of the surface and atmosphere.
– Maximum temperature occurs when the net energy balance transitions from positive (energy gain) to negative (energy loss). This transition point usually happens a few hours after maximum solar input and *before* sunset.
– After sunset, the net radiation balance is negative, and the surface cools.
The duration of the temperature lag (C) is influenced by factors like wind speed (mixing), cloud cover (insulation), humidity (evaporative cooling, water vapour greenhouse effect), and the thermal properties of the surface material. Vegetation cover (D) promotes evapotranspiration, which consumes energy (latent heat), thus reducing the energy available for sensible heating and lowering maximum surface and air temperatures.

469. The most significant ‘variable gases’ in the atmosphere are

The most significant ‘variable gases’ in the atmosphere are

[amp_mcq option1=”oxygen and carbon dioxide” option2=”carbon dioxide and nitrogen” option3=”water vapour and carbon dioxide” option4=”water vapour and oxygen” correct=”option3″]

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Variable gases in the atmosphere are those whose concentrations change significantly over time and space. Water vapour (H2O) is the most variable gas, with concentrations varying widely depending on temperature, location, and weather conditions. Carbon dioxide (CO2) is also a variable gas, with seasonal cycles and significant long-term increase due to human activities. Both are major greenhouse gases.
– Nitrogen (N2) and oxygen (O2) are the most abundant gases but are considered permanent or fixed gases because their global concentrations are relatively constant (around 78% N2 and 21% O2).
– Variable gases like water vapour, carbon dioxide, methane, and ozone exist in much smaller concentrations but play crucial roles in atmospheric processes, particularly climate and weather.
Water vapour is the most potent greenhouse gas, although its concentration is highly variable. Carbon dioxide is a less potent greenhouse gas molecule-for-molecule than some others (like methane) but its higher concentration and long atmospheric lifetime make it a primary driver of current climate change.

470. Soils which reflect the composition of underlying rocks are always

Soils which reflect the composition of underlying rocks are always

[amp_mcq option1=”young” option2=”highly evolved” option3=”mature” option4=”moderately old” correct=”option1″]

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Soils develop over time through processes like weathering, decomposition, and horizon formation (pedogenesis). Young or immature soils have undergone limited pedogenic development. As a result, their properties, including mineral composition, strongly reflect the composition of the underlying parent material (bedrock or unconsolidated deposits). Highly evolved or mature soils have distinct horizons and properties that may differ significantly from the parent material due to long-term processes.
– Soil formation (pedogenesis) is a gradual process.
– Young soils are characterized by limited horizon development.
– The characteristics of young soils are strongly influenced by the parent material.
– Mature soils have well-developed horizons and properties modified by time, climate, organisms, and topography.
The degree to which a soil’s composition reflects its parent material is often used as an indicator of soil age and development stage. In highly weathered (evolved/mature) soils, many original minerals from the parent rock may have been altered or leached away, leaving behind more resistant materials or newly formed secondary minerals.
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