World and Physical Geography

311. The normal lapse rate of temperature of Earth’s atmosphere drops to 0°

The normal lapse rate of temperature of Earth’s atmosphere drops to 0°C at the

[amp_mcq option1=”upper part of ionosphere.” option2=”upper boundary of the tropopause.” option3=”lower part of mesosphere.” option4=”upper boundary of stratopause.” correct=”option4″]

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The temperature of the Earth’s atmosphere generally decreases with altitude in the troposphere (normal lapse rate), increases in the stratosphere, decreases again in the mesosphere, and increases in the thermosphere. The temperature reaches a relative maximum around 0°C at the upper boundary of the stratopause.
The stratopause marks the boundary between the stratosphere and the mesosphere. In the stratosphere, temperature increases due to absorption of UV radiation by ozone. This increase stops at the stratopause, where the temperature is typically around 0°C before decreasing sharply in the mesosphere. The “normal lapse rate” (temperature decrease with height) applies to the troposphere and mesosphere. The question phrasing is slightly ambiguous (“rate… drops to 0°C at the”), but in the context of atmospheric layers and boundaries, it most likely refers to the temperature value reaching around 0°C at a boundary where the lapse rate changes direction.
The approximate temperatures at key boundaries are: Tropopause (top of troposphere): -50°C to -60°C (highly variable). Stratopause (top of stratosphere): around 0°C. Mesopause (top of mesosphere): -90°C to -100°C (coldest point). Temperature increases rapidly in the thermosphere.

312. Which one of the following statements about the Suez Canal is not corr

Which one of the following statements about the Suez Canal is not correct ?

[amp_mcq option1=”The Suez Canal was constructed in 1869.” option2=”It links the Mediterranean Sea and the Red Sea.” option3=”It has a six lock system and ships cross the different levels through these locks.” option4=”It has given Europe a new gateway to the Indian Ocean.” correct=”option3″]

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Let’s evaluate each statement about the Suez Canal.
A) The Suez Canal was constructed in 1869. This is correct; it officially opened on November 17, 1869.
B) It links the Mediterranean Sea and the Red Sea. This is correct; it provides a direct waterway between Port Said on the Mediterranean and Suez on the Red Sea.
C) It has a six lock system and ships cross the different levels through these locks. This is incorrect. The Suez Canal is a sea-level canal. This means there is no significant difference in water level between the Mediterranean Sea and the Red Sea, and therefore, locks are not needed for ships to transit.
D) It has given Europe a new gateway to the Indian Ocean. This is correct. Before the canal, ships had to sail around the southern tip of Africa (Cape of Good Hope) to travel between Europe and the Indian Ocean/Asia. The Suez Canal drastically shortened this route, making it a vital gateway.
– Suez Canal is a sea-level canal; it does not use locks.
– Opened in 1869.
– Connects Mediterranean Sea and Red Sea.
– Shortened the sea route between Europe and Asia/Indian Ocean.
The idea of a canal connecting the Mediterranean and Red Seas dates back to ancient times. The modern canal was built by the Suez Canal Company (a French-Egyptian enterprise) under the leadership of Ferdinand de Lesseps. It has been expanded and deepened over the years to accommodate larger vessels.

313. In which one of the following folds is the axial plane found to be vir

In which one of the following folds is the axial plane found to be virtually horizontal ?

[amp_mcq option1=”Isoclinal” option2=”Anticlinal” option3=”Recumbent” option4=”Monoclinal” correct=”option3″]

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Folds are bends in layers of rock or sediment. The axial plane is an imaginary plane that bisects the angle between the limbs of the fold and contains the hinge line. In an Isoclinal fold, the limbs are parallel to each other, but the axial plane can be vertical, inclined, or horizontal. An Anticlinal fold is an upward fold, typically with a vertical or steeply dipping axial plane. A Monoclinal fold is a step-like bend. A Recumbent fold is a type of fold where the axial plane is essentially horizontal or nearly horizontal, causing the upper limb to be overturned.
– Recumbent fold: Axial plane is horizontal or near-horizontal.
– Isoclinal fold: Limbs are parallel (axial plane can be any orientation).
– Anticlinal fold: Upward fold (axial plane typically steep).
– Monoclinal fold: Step-like fold.
Recumbent folds indicate significant compressional forces where rock layers have been severely deformed and often transported horizontally over distance (resulting in nappe structures in extreme cases). They are common in intensely deformed mountain belts.

314. According to the Köppen climatic classification, the letter code Cfa d

According to the Köppen climatic classification, the letter code Cfa denotes

[amp_mcq option1=”Tropical wet climate.” option2=”Humid subtropical climate.” option3=”Tundra climate.” option4=”Tropical wet and dry climate.” correct=”option2″]

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The Köppen climate classification uses letters to denote climate types. The first letter indicates the main climate group: C denotes Temperate climates, characterized by average temperature of the coldest month between 0°C (or -3°C in some variations) and 18°C. The second letter indicates precipitation patterns: f denotes fully humid, meaning significant precipitation throughout the year. The third letter indicates the temperature of the summer: a denotes a hot summer, where the average temperature of the warmest month is over 22°C. Combining C, f, and a defines a Humid Subtropical climate, typically found on the eastern sides of continents between 25° and 40° latitude, characterized by hot, humid summers and mild winters.
– C: Temperate climate.
– f: Fully humid (precipitation in all seasons).
– a: Hot summer (warmest month > 22°C).
– Cfa classification corresponds to Humid Subtropical climate.
Other Köppen codes for the given options: Tropical wet climate is Af. Tundra climate is ET. Tropical wet and dry climate is Aw or As. Understanding the meaning of the letter codes is key to applying the Köppen classification system.

315. Which one of the following sedimentary rocks is organically formed ?

Which one of the following sedimentary rocks is organically formed ?

[amp_mcq option1=”Shale” option2=”Chert” option3=”Halite” option4=”Chalk” correct=”option4″]

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Sedimentary rocks are formed from the accumulation or deposition of mineral or organic particles. Organically formed sedimentary rocks are composed primarily of the remains of organisms (plants or animals). Chalk is a type of limestone composed mainly of the microscopic calcium carbonate shells (coccoliths) of marine algae called coccolithophores. Shale is a clastic sedimentary rock made of clay and silt. Chert is a hard, fine-grained rock composed of microcrystalline quartz, typically formed chemically or biochemically (though often grouped with chemical rocks). Halite (rock salt) is a chemical sedimentary rock formed by the evaporation of saline water. Therefore, Chalk is the only rock among the options that is definitively and primarily formed from organic remains.
– Organically formed sedimentary rocks are composed of organic remains.
– Chalk is made of fossilized microscopic marine organisms.
– Shale is clastic, Chert is chemical/biochemical, Halite is chemical.
Other examples of organically formed sedimentary rocks include coal (formed from accumulated plant remains) and some types of limestone composed of larger shell fragments or coral reefs. The classification of some rocks like Chert can be debated depending on the origin of the silica (chemical vs. biogenic). However, chalk is a classic example of an organically formed rock.

316. Which one of the following land territories of Indonesia is not touche

Which one of the following land territories of Indonesia is not touched by the Equator ?

[amp_mcq option1=”Sumatra” option2=”Sulawesi” option3=”Java” option4=”Kalimantan” correct=”option3″]

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The Equator is an imaginary line encircling the Earth at 0 degrees latitude. It passes through several large Indonesian islands. Sumatra is crossed by the Equator in its central part. Sulawesi (formerly Celebes) is also crossed by the Equator in its northern arm. Kalimantan, the Indonesian part of the island of Borneo, is significantly crossed by the Equator. Java, however, is located entirely to the south of the Equator. Its capital city, Jakarta, is also south of the Equator.
– Equator passes through Sumatra, Sulawesi, and Kalimantan.
– Java is located entirely south of the Equator.
Indonesia is an archipelagic nation spanning a vast area across the Equator, giving it both Northern and Southern Hemisphere territories. The climate on islands crossed by the Equator is typically tropical wet (Af in Köppen classification), characterized by high temperatures and rainfall throughout the year.

317. Which one of the following hypothesis/theory explains the origin of th

Which one of the following hypothesis/theory explains the origin of the universe ?

[amp_mcq option1=”Nebular hypothesis” option2=”Binary theory” option3=”Big Bang theory” option4=”Planetesimal hypothesis” correct=”option3″]

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The Big Bang theory is the most widely accepted cosmological model explaining the origin and evolution of the universe. It postulates that the universe originated from a singular point of extremely high density and temperature approximately 13.8 billion years ago and has been expanding ever since. The other hypotheses listed explain the formation of stars, planets, or solar systems, not the entire universe.
Cosmology studies the origin, evolution, and structure of the universe. The Big Bang theory is the standard model in cosmology.
Evidence supporting the Big Bang theory includes the cosmic microwave background radiation, the observed expansion of the universe (Hubble’s Law), and the abundance of light elements (hydrogen, helium, lithium). The nebular hypothesis and planetesimal hypothesis are related to the formation of stars and planetary systems within the universe, not the universe itself.

318. Which one of the following ocean currents is a cold current ?

Which one of the following ocean currents is a cold current ?

[amp_mcq option1=”South Atlantic Drift” option2=”Mozambique Current” option3=”East Australian Current” option4=”Caribbean Current” correct=”option1″]

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Ocean currents are classified as warm or cold based on whether they flow from warmer to colder regions (warm currents) or from colder to warmer regions (cold currents), relative to the surrounding water. The Mozambique Current, East Australian Current, and Caribbean Current are warm currents flowing from equatorial regions towards higher latitudes. The South Atlantic Drift is part of the Antarctic Circumpolar Current system and is influenced by the West Wind Drift; it carries relatively cold water eastwards across the South Atlantic.
Warm ocean currents typically flow along the eastern coasts of continents in lower and middle latitudes, and western coasts in higher latitudes. Cold ocean currents typically flow along the western coasts of continents in lower and middle latitudes, and eastern coasts in higher latitudes.
Major cold currents include the Labrador Current, Canary Current, California Current, Benguela Current, Peru Current, and the West Wind Drift (part of which is the South Atlantic Drift). Warm currents include the Gulf Stream, North Atlantic Drift, Kuroshio Current, Brazil Current, Agulhas Current, and East Australian Current.

319. The rivers of North-West Europe are good examples of

The rivers of North-West Europe are good examples of

[amp_mcq option1=”parallel pattern of drainage.” option2=”radial pattern of drainage.” option3=”barbed pattern of drainage.” option4=”trellis pattern of drainage.” correct=”option4″]

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The trellis pattern of drainage is characteristic of regions with folded topography and alternating layers of resistant and less resistant rocks. Rivers flow along the strike of the less resistant rocks, and tributaries join at right angles, cutting across the resistant ridges. While North-West Europe has varied terrain, folded structures are present in some areas (e.g., parts of the Paris Basin, the Ardennes, parts of Germany bordering NW Europe), leading to the development of trellis drainage patterns in those regions.
Different drainage patterns (dendritic, trellis, radial, parallel, rectangular, barbed, etc.) develop depending on the underlying geological structure, topography, and rock type. Trellis drainage is strongly controlled by geological structure, specifically folded rocks.
Dendritic pattern is the most common pattern and develops on uniform rock strata. Radial pattern develops around a central elevated point (like a volcano or dome). Parallel pattern occurs on uniformly sloping surfaces. Rectangular pattern is found in areas with jointed or faulted bedrock. Barbed pattern occurs when a tributary joins a main river in the opposite direction of the main river’s flow, often indicating river capture.

320. Which one of the following is a non-metallic mineral ?

Which one of the following is a non-metallic mineral ?

[amp_mcq option1=”Iron” option2=”Mica” option3=”Copper” option4=”Bauxite” correct=”option2″]

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Minerals are broadly classified into metallic and non-metallic minerals. Metallic minerals contain one or more metallic elements, while non-metallic minerals do not. Iron, Copper, and Bauxite (an ore of aluminum) are metallic minerals. Mica is a silicate mineral that does not contain metallic elements and is classified as a non-metallic mineral.
Metallic minerals are sources of metals (e.g., iron ore, copper ore, bauxite), while non-metallic minerals are used for various purposes other than obtaining metals (e.g., building materials, chemicals, fertilizers, gemstones).
Examples of metallic minerals include hematite, magnetite, bauxite, chalcopyrite, chromite, gold, silver, etc. Examples of non-metallic minerals include mica, limestone, gypsum, dolomite, feldspar, quartz, diamond, coal, petroleum, etc.
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