Physical geography forms a core component of competitive examinations like UPSC Civil Services, SSC CGL, CDS, and state public service commissions, testing candidates on Earth’s natural systems. It integrates geomorphology, climatology, oceanography, and biogeography to explain landform evolution, climate dynamics, and marine processes. Mastery of these physical earth sciences is essential for analyzing natural hazards, resource distribution, and global environmental patterns. Questions in competitive exams frequently evaluate conceptual clarity, spatial reasoning, and the practical application of earth science principles.
1. Which is the most abundant element in the Earth's crust by weight?
Correct Answer: b) Oxygen
Explanation:
Oxygen is the most abundant element in the Earth's crust, making up about 46.6% of its weight, followed by silicon at 27.7%.
2. The boundary that separates the Earth's crust from the underlying mantle is known as the:
Correct Answer: c) Mohorovicic Discontinuity
Explanation:
The Mohorovicic (Moho) Discontinuity marks the boundary between the Earth's crust and the mantle, characterized by a change in seismic wave velocity.
3. Which of the following is the most abundant metal in the Earth's crust?
Correct Answer: c) Aluminum
Explanation:
Aluminum is the most abundant metal in the Earth's crust (around 8.1%), followed by iron (5.0%).
4. The core of the Earth is primarily composed of which two elements?
Correct Answer: c) Nickel and Iron
Explanation:
The Earth's core is predominantly composed of a nickel-iron alloy, which is why it is often referred to as NiFe (Nickel and Ferrum).
5. Who originally proposed the theory of Continental Drift in 1912?
Correct Answer: c) Alfred Wegener
Explanation:
Alfred Wegener, a German meteorologist, proposed the Continental Drift theory in 1912, suggesting all continents were once a single supercontinent called Pangea.
6. Basalt is a prime example of which type of rock?
Correct Answer: b) Extrusive Igneous
Explanation:
Basalt is an extrusive igneous (volcanic) rock formed from the rapid cooling of basaltic lava exposed at or very near the surface of a planet or moon.
7. Marble is a metamorphic rock formed by the alteration of which sedimentary rock?
Correct Answer: c) Limestone
Explanation:
Marble forms when limestone is subjected to the heat and pressure of metamorphism.
8. The 'Ring of Fire', known for its intense volcanic and earthquake activity, is located in the basin of which ocean?
Correct Answer: c) Pacific Ocean
Explanation:
The Pacific Ring of Fire is a major area in the basin of the Pacific Ocean where many earthquakes and volcanic eruptions occur, driven by plate tectonics.
9. Which of the following earthquake seismic waves travels the fastest?
Correct Answer: b) P-waves
Explanation:
Primary waves (P-waves) are compressional waves that travel faster than any other seismic waves and are the first to arrive at a seismograph station.
10. S-waves (Secondary waves) cannot pass through which layer of the Earth?
Correct Answer: c) Outer Core
Explanation:
S-waves are transverse waves that can only move through solid rock. They cannot pass through the liquid outer core.
11. The point on the Earth's surface directly above the focus of an earthquake is called the:
Correct Answer: b) Epicenter
Explanation:
The epicenter is the point on the Earth's surface vertically above the focus (or hypocenter), which is the actual site of energy release.
12. The peeling away of outer layers of rock due to temperature changes or pressure release is a physical weathering process known as:
Correct Answer: c) Exfoliation
Explanation:
Exfoliation is a mechanical weathering process where curved plates of rock are stripped from rock below, often forming exfoliation domes.
13. An oxbow lake is a landform associated with which stage of a river's course?
Correct Answer: b) Middle or lower course
Explanation:
Oxbow lakes form in the middle to lower course of a river where meandering is prominent. A meander loop gets cut off to form a U-shaped lake.
14. Moraines are depositional features formed by the action of:
Correct Answer: c) Glaciers
Explanation:
A moraine is any glacially formed accumulation of unconsolidated glacial debris (soil and rock) that occurs in currently glaciated and formerly glaciated regions.
15. A barchan is a crescent-shaped landform created by the deposition of:
Correct Answer: c) Wind-blown sand
Explanation:
Barchans are crescent-shaped sand dunes produced by the action of wind predominating from one direction.
16. Stalactites and stalagmites are prominent features of which type of topography?
Correct Answer: b) Karst
Explanation:
Karst topography is a landscape formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum, featuring caves with stalactites and stalagmites.
17. V-shaped valleys are primarily carved out by the erosional action of:
Correct Answer: c) Rivers
Explanation:
V-shaped valleys are carved out by rivers in their upper (youthful) course where downward erosion is dominant.
18. U-shaped valleys are characteristic erosional landforms created by:
Correct Answer: b) Glaciers
Explanation:
As glaciers move slowly down a valley, they erode the sides and bottom, transforming typical V-shaped river valleys into broad, U-shaped glacial valleys.
19. Which is the lowest layer of the Earth's atmosphere where almost all weather phenomena occur?
Correct Answer: c) Troposphere
Explanation:
The troposphere is the lowest atmospheric layer. It contains about 75% of the atmosphere's mass and almost all of its water vapor and weather activity.
20. The ozone layer, which protects the Earth from harmful ultraviolet radiation, is located in the:
Correct Answer: b) Stratosphere
Explanation:
The ozone layer is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet (UV) radiation.
21. In which layer of the atmosphere do most meteors burn up upon entering Earth's atmosphere?
Correct Answer: c) Mesosphere
Explanation:
The mesosphere is the third layer of the atmosphere, where temperatures drop low enough and air density is just high enough to cause meteors to burn up.
22. Radio waves transmitted from the Earth are reflected back by the:
Correct Answer: b) Ionosphere
Explanation:
The ionosphere contains a high concentration of ions and free electrons, which reflects radio waves back to Earth, facilitating long-distance communication.
23. What is the most abundant gas in the Earth's atmosphere?
Correct Answer: c) Nitrogen
Explanation:
Nitrogen is the most abundant gas in the Earth's atmosphere, constituting about 78% of the air by volume.
24. Oxygen constitutes approximately what percentage of the Earth's atmosphere by volume?
Correct Answer: b) 21%
Explanation:
Oxygen makes up roughly 21% of the Earth's atmosphere by volume, serving as the second most abundant gas after nitrogen.
25. The proportion of solar radiation reflected by a surface is known as its:
Correct Answer: b) Albedo
Explanation:
Albedo is a measure of the reflectivity of a surface. Earth's average albedo is about 0.30 (or 30%), meaning 30% of incoming sunlight is reflected back to space.
26. Which instrument is used to measure atmospheric pressure?
Correct Answer: c) Barometer
Explanation:
A barometer is a scientific instrument used to measure atmospheric pressure, which helps in forecasting short term changes in the weather.
27. Lines drawn on a map joining places with equal atmospheric pressure are called:
Correct Answer: c) Isobars
Explanation:
Isobars are lines on a weather map connecting points of equal atmospheric pressure.
28. The Coriolis force, caused by the Earth's rotation, is minimum (zero) at the:
Correct Answer: c) Equator
Explanation:
The Coriolis force is zero at the equator and increases towards the poles. This is why cyclones do not form exactly at the equator.
29. Due to the Coriolis effect, moving winds are deflected to the right in the:
Correct Answer: b) Northern Hemisphere
Explanation:
According to Ferrel's Law, the Coriolis force deflects winds to their right in the Northern Hemisphere and to their left in the Southern Hemisphere.
30. Planetary winds that blow from the subtropical high-pressure belts towards the equatorial low-pressure belt are known as:
Correct Answer: c) Trade Winds
Explanation:
Trade winds are steady planetary winds that blow towards the equator from the subtropical high-pressure belts in both hemispheres.
31. The 'Roaring Forties' are strong westerly winds found exclusively in the:
Correct Answer: b) Southern Hemisphere
Explanation:
The Roaring Forties are strong westerly winds found between latitudes 40 and 50 degrees south, where there are few landmasses to slow them down.
32. The Chinook is a warm, dry local wind that blows down the eastern slopes of which mountain range?
Correct Answer: c) Rocky Mountains
Explanation:
Chinook winds are warm, dry winds that descend the eastern slopes of the Rocky Mountains in North America, famously known as 'snow eaters'.
33. The Foehn is a warm and dry local wind famously associated with the:
Correct Answer: a) Alps
Explanation:
The Foehn (or Föhn) is a warm, dry, downslope wind that occurs in the lee of a mountain range, most famously the Alps in Europe.
34. The Mistral is a strong, cold, northwesterly wind that blows across which country into the Mediterranean Sea?
Correct Answer: c) France
Explanation:
The Mistral is a cold, dry, strong regional wind in southern France that blows down the Rhone valley into the Mediterranean Sea.
35. The Sirocco is a hot, dry, dust-laden wind that blows from the Sahara Desert towards:
Correct Answer: b) The Mediterranean region and Southern Europe
Explanation:
Sirocco winds originate in the Sahara and blow northwards across the Mediterranean Sea, bringing hot, dusty air to Southern Europe, sometimes causing 'blood rain'.
36. Which instrument is used to measure the relative humidity of the atmosphere?
Correct Answer: b) Hygrometer
Explanation:
A hygrometer is an instrument used to measure the moisture content or relative humidity of air or any gas.
37. Which type of clouds are found at the highest altitudes, appearing wispy and composed of ice crystals?
Correct Answer: c) Cirrus
Explanation:
Cirrus clouds are high-altitude clouds that are thin, wispy, and composed entirely of ice crystals due to the freezing temperatures at those heights.
38. Which clouds are large, vertically developed, and associated with thunderstorms and heavy rain?
Correct Answer: a) Cumulonimbus
Explanation:
Cumulonimbus clouds are dense, towering vertical clouds associated with thunderstorms, lightning, heavy rain, and sometimes hail.
39. Convectional rainfall is a typical and highly frequent weather phenomenon in which region?
Correct Answer: c) Equatorial regions
Explanation:
In equatorial regions, intense daytime heating causes rapid convection, leading to frequent, heavy convectional afternoon showers.
40. Rainfall caused by moisture-laden winds being forced to rise over a mountain range is known as:
Correct Answer: b) Orographic rainfall
Explanation:
Orographic (relief) rainfall occurs when moist air is lifted as it moves over a mountain range. The air cools and condenses, bringing rain to the windward side.
41. The calm, cloudless, low-pressure center of a tropical cyclone is called its:
Correct Answer: b) Eye
Explanation:
The 'eye' of a tropical cyclone is a roughly circular area of comparatively light winds, clear skies, and lowest atmospheric pressure at the center of the storm.
42. Intense tropical cyclones in the Atlantic Ocean and the eastern Pacific Ocean are known as:
Correct Answer: c) Hurricanes
Explanation:
Tropical cyclones are regionally named. In the Atlantic and Northeast Pacific, they are called hurricanes.
43. In the northwestern Pacific Ocean (near East Asia), tropical cyclones are commonly known as:
Correct Answer: b) Typhoons
Explanation:
In the Northwest Pacific, which includes countries like Japan, the Philippines, and China, these storms are called typhoons.
44. In Australia, severe tropical cyclones have historically been referred to as:
Correct Answer: c) Willy-willies
Explanation:
Willy-willy is a traditional Australian term for a tropical cyclone or a strong dust devil, though 'cyclone' is more commonly used in modern meteorology.
45. In the Köppen climate classification system, the letter 'Af' represents:
Correct Answer: b) Tropical Rainforest
Explanation:
In the Köppen system, 'A' stands for tropical and 'f' means no dry season, so 'Af' denotes a Tropical Rainforest climate.
46. In the Köppen climate classification, a 'Cs' climate represents:
Correct Answer: c) Mediterranean (dry summer)
Explanation:
The 'Cs' classification denotes a temperate climate (C) with a dry summer (s), which perfectly describes the Mediterranean climate.
47. The shallow, gently sloping part of the ocean floor extending from the shoreline is called the:
Correct Answer: c) Continental Shelf
Explanation:
The continental shelf is the submerged edge of a continent, gently sloping and shallow, ending at the shelf break.
48. The deepest known point in the Earth's oceans is the Mariana Trench, located in the:
Correct Answer: c) Pacific Ocean
Explanation:
The Mariana Trench is located in the western Pacific Ocean and contains the Challenger Deep, the deepest known point on Earth.
49. The average salinity of the global oceans is approximately:
Correct Answer: c) 35 parts per thousand
Explanation:
The average salinity of ocean water is about 35 parts per thousand (ppt), meaning there are 35 grams of dissolved salts in 1,000 grams of seawater.
50. Among the following, which water body is renowned for having one of the highest salinities in the world?
Correct Answer: c) Dead Sea
Explanation:
The Dead Sea has a salinity of around 342 ppt, making it one of the saltiest bodies of water on Earth, far exceeding typical ocean salinity.
51. Spring tides, which produce the highest high tides and lowest low tides, occur during which phases of the moon?
Correct Answer: b) Full moon and new moon
Explanation:
Spring tides occur when the Earth, Moon, and Sun are aligned (syzygy), which happens during the full moon and new moon phases.
52. Neap tides, which have the smallest tidal range, occur when the Sun and Moon are:
Correct Answer: b) At a right angle (90 degrees) to the Earth
Explanation:
Neap tides occur during the first and third quarter moons when the gravitational pull of the Sun and Moon partially cancel each other out.
53. The Gulf Stream is a powerful, warm ocean current found in the:
Correct Answer: c) North Atlantic Ocean
Explanation:
The Gulf Stream is a strong, warm ocean current that originates in the Gulf of Mexico and travels up the eastern coast of the US and across the North Atlantic.
54. The Kuroshio Current, similar to the Gulf Stream, is a strong, warm western boundary current located in the:
Correct Answer: b) North Pacific Ocean
Explanation:
The Kuroshio Current is a warm ocean current flowing northwards off the eastern coast of Taiwan and Japan in the North Pacific Ocean.
55. Which of the following is a cold ocean current that flows southward along the east coast of North America?
Correct Answer: b) Labrador Current
Explanation:
The Labrador Current is a cold current in the North Atlantic Ocean which flows from the Arctic Ocean south along the coast of Labrador and passes around Newfoundland.
56. The Humboldt Current, also known as the Peru Current, is a cold current located in the:
Correct Answer: b) South Pacific
Explanation:
The Humboldt Current flows northward along the western coast of South America, bringing cold, nutrient-rich water to the surface.
57. The Agulhas Current is a warm western boundary current that flows down the eastern coast of:
Correct Answer: c) Africa
Explanation:
The Agulhas Current flows southward along the east coast of South Africa in the southwestern Indian Ocean.
58. The Sargasso Sea, uniquely defined entirely by ocean currents rather than land boundaries, is located in the:
Correct Answer: b) North Atlantic Ocean
Explanation:
The Sargasso Sea is a region of the North Atlantic Ocean bounded by four currents forming an ocean gyre, famous for its floating Sargassum seaweed.
59. Coral reefs generally require warm, shallow, and clear oceanic waters with a temperature typically ranging between:
Correct Answer: c) 20°C to 28°C
Explanation:
Reef-building corals cannot tolerate water temperatures below 18°C, and they thrive best in water temperatures between 20°C and 28°C.
60. The Great Barrier Reef, the world's largest coral reef system, is located off the coast of:
Correct Answer: b) Queensland, Australia
Explanation:
The Great Barrier Reef is located in the Coral Sea, off the northeastern coast of Queensland, Australia.
61. Tsunamis are massive, destructive ocean waves most frequently generated by:
Correct Answer: b) Underwater earthquakes or landslides
Explanation:
A tsunami is a series of waves in a water body caused by the displacement of a large volume of water, typically due to undersea earthquakes, landslides, or volcanic eruptions.
62. The longest day of the year in the Northern Hemisphere occurs on the Summer Solstice, which falls around:
Correct Answer: b) June 21
Explanation:
On June 21, the Sun is directly overhead at the Tropic of Cancer, making it the longest day of the year in the Northern Hemisphere.
63. The shortest day of the year in the Northern Hemisphere (Winter Solstice) occurs around:
Correct Answer: b) December 22
Explanation:
On December 22, the Sun is directly over the Tropic of Capricorn, causing the Northern Hemisphere to experience its shortest day and longest night.
64. Equinoxes, when day and night are of approximately equal length globally, occur around which two dates?
Correct Answer: b) March 21 and September 23
Explanation:
During an equinox (Vernal on March 21 and Autumnal on Sept 23), the Sun is directly overhead at the Equator, resulting in equal day and night worldwide.
65. The distance between any two consecutive lines of latitude is approximately:
Correct Answer: b) 111 km
Explanation:
Lines of latitude are parallel, and the distance between each degree of latitude is relatively constant at approximately 111 kilometers (69 miles).
66. What is the total number of longitudes drawn on the globe at one-degree intervals?
Correct Answer: c) 360
Explanation:
There are 360 degrees of longitude (180 degrees East and 180 degrees West of the Prime Meridian).
67. The Prime Meridian, which is defined as 0 degrees longitude, passes through the Royal Observatory in:
Correct Answer: b) Greenwich, London
Explanation:
The Prime Meridian passes through the Royal Observatory at Greenwich, London, establishing Greenwich Mean Time (GMT).
68. The International Date Line roughly follows which meridian of longitude?
Correct Answer: c) 180°
Explanation:
The International Date Line generally follows the 180° meridian in the Pacific Ocean, though it zig-zags to avoid splitting countries into two different days.
69. In which direction does the Earth rotate on its axis?
Correct Answer: c) West to East
Explanation:
The Earth rotates from West to East, which is why the Sun, Moon, and stars appear to rise in the East and set in the West.
70. The point in the Earth's orbit where it is closest to the Sun is called:
Correct Answer: d) Perihelion
Explanation:
Perihelion is the point in Earth's elliptical orbit where it is closest to the Sun, occurring usually around January 3.
71. The point in the Earth's orbit where it is farthest from the Sun is called:
Correct Answer: a) Aphelion
Explanation:
Aphelion occurs around July 4, when the Earth is at its maximum distance from the Sun.
72. Due to equatorial bulging and polar flattening, the true shape of the Earth is best described as an:
Correct Answer: b) Oblate Spheroid (Geoid)
Explanation:
The Earth is not a perfect sphere; its rotation causes it to bulge at the equator and flatten at the poles, making it an oblate spheroid or geoid.
73. Which of the following biomes supports the greatest variety of flora and fauna (highest biodiversity)?
Correct Answer: b) Tropical Rainforest
Explanation:
Tropical rainforests have optimal conditions (constant warmth and moisture) that support the highest biodiversity of any terrestrial biome.
74. The biome characterized by coniferous forests, cold winters, and short summers, spreading across North America and Eurasia, is the:
Correct Answer: c) Taiga (Boreal Forest)
Explanation:
The Taiga, or Boreal Forest, is the world's largest terrestrial biome, dominated by coniferous trees like pines, spruces, and larches.
75. The treeless biome in the extreme north, characterized by permafrost, mosses, and lichens, is the:
Correct Answer: b) Tundra
Explanation:
The Tundra is a harsh, cold biome with a permanently frozen subsoil (permafrost) that prevents the growth of deep-rooted trees.
76. The vast temperate grasslands of North America are known as the:
Correct Answer: d) Prairies
Explanation:
The Prairies are the temperate grasslands found in the central United States and Canada, known for their fertile soils.
77. The highly fertile temperate grasslands of South America (Argentina and Uruguay) are called the:
Correct Answer: a) Pampas
Explanation:
The Pampas are fertile South American lowlands dominated by temperate grasslands.
78. The continuous belt of temperate grassland stretching across Eastern Europe and Central Asia is called the:
Correct Answer: b) Steppes
Explanation:
The Eurasian Steppe is a massive temperate grassland stretching from Eastern Europe to Central Asia.
79. In South Africa, the open, uncultivated temperate grassland biome is known as the:
Correct Answer: c) Veld
Explanation:
The Veld is the name given to the grassy plains and open country of Southern Africa.
80. The temperate grasslands of Australia, known for sheep farming, are called the:
Correct Answer: a) Downs
Explanation:
The Darling Downs and other similar regions represent the temperate grasslands in Australia.
81. Laterization is a soil-forming process typical of hot, wet tropical climates, which results in soils rich in:
Correct Answer: b) Iron and aluminum oxides
Explanation:
Intense leaching in tropical rain washes away silica and nutrients, leaving behind laterite soils rich in iron and aluminum oxides.
82. Which type of soil in India is known as 'Regur' and is highly suitable for cotton cultivation?
Correct Answer: c) Black Soil
Explanation:
Black soil, formed from weathered volcanic basalt, retains moisture exceptionally well and is famously known as 'Regur' or black cotton soil.
83. Loess is a highly porous, fertile soil deposit formed primarily by the action of:
Correct Answer: c) Wind
Explanation:
Loess is an unstratified, geologically recent deposit of silty or loamy material that is usually highly calcareous, deposited primarily by wind.
84. Alluvial soils, which are the most fertile and widespread in river valleys, are formed by the depositional action of:
Correct Answer: c) Rivers
Explanation:
Alluvial soils are transported and deposited by surface water (rivers and streams) and are highly prized for agriculture.
85. The process of rock breakdown that involves physical forces (like freeze-thaw) without changing the rock's chemical composition is:
Correct Answer: c) Physical (Mechanical) weathering
Explanation:
Physical or mechanical weathering breaks rocks into smaller pieces without altering their chemical identity.
86. Hydration, oxidation, and carbonation are all types of:
Correct Answer: b) Chemical weathering
Explanation:
These processes involve chemical reactions that alter the minerals within rocks, characterizing chemical weathering.
87. The downslope movement of rock, regolith, and soil under the direct influence of gravity is called:
Correct Answer: c) Mass wasting (Mass movement)
Explanation:
Mass wasting encompasses processes like landslides, rockfalls, and soil creep, driven by gravity rather than a transporting medium like water or wind.
88. A river drainage pattern that branches out irregularly, resembling the veins of a leaf or branches of a tree, is called:
Correct Answer: c) Dendritic
Explanation:
A dendritic drainage pattern is the most common form and looks like the branching pattern of tree roots or branches.
89. A drainage pattern where rivers flow outward from a central high point, like a volcano or dome, is known as:
Correct Answer: c) Radial
Explanation:
Radial drainage patterns develop around a central elevated point, with streams radiating outward like the spokes of a wheel.
90. Unlike a delta, an estuary is characterized by being a:
Correct Answer: b) Partially enclosed coastal body where freshwater mixes with saltwater without heavy sediment buildup
Explanation:
An estuary forms where a river meets the sea and tides wash away sediment, preventing the formation of a delta.
91. Mid-ocean ridges, the longest mountain chains on Earth, are formed at which type of tectonic plate boundary?
Correct Answer: c) Divergent boundary
Explanation:
Mid-ocean ridges form where tectonic plates are pulling apart (diverging), allowing magma to rise and create new oceanic crust.
92. Massive fold mountains, like the Himalayas and the Alps, are primarily formed by which tectonic interaction?
Correct Answer: b) Convergent plate boundaries (continental collision)
Explanation:
When two continental plates collide, the crust crumples and folds upwards, forming massive fold mountain ranges.
93. Which of the following is a classic example of a Block Mountain (Horst) formed by faulting?
Correct Answer: c) Black Forest Mountains
Explanation:
The Black Forest in Germany and the Vosges in France are classic examples of block mountains, formed when large blocks of crust are uplifted along faults.
94. The Aravalli Range in India is one of the world's oldest fold mountains and is now classified as a:
Correct Answer: b) Residual (relict) mountain
Explanation:
Due to millions of years of continuous erosion, the ancient Aravalli mountains have been reduced to residual or relict mountains.
95. Which instrument is used to detect and record the seismic waves generated by an earthquake?
Correct Answer: b) Seismograph
Explanation:
A seismograph (or seismometer) is the scientific instrument used to detect, measure, and record the vibrations of earthquake waves.
96. The magnitude (total energy released) of an earthquake is traditionally measured using the:
Correct Answer: c) Richter scale
Explanation:
The Richter scale is a base-10 logarithmic scale used to measure the magnitude of an earthquake based on the amplitude of seismic waves.
97. While magnitude measures energy, the intensity (observable damage) of an earthquake is measured using the:
Correct Answer: b) Mercalli scale
Explanation:
The Modified Mercalli Intensity scale measures the effects and structural damage caused by an earthquake at a specific location, using Roman numerals I to XII.
98. The boundary layer that separates the weather-active troposphere from the calm stratosphere above is called the:
Correct Answer: c) Tropopause
Explanation:
The tropopause is the thermodynamic boundary layer between the troposphere and the stratosphere, capping most cloud formations and weather systems.
