Climatology: UPSC Previous Year Questions (Geography)
55 previous year UPSC Prelims questions on climatology make up this page, from 1996 to 2025. UPSC asks about the structure and heating of the atmosphere, isotherms, jet streams, wind belts, cyclones and climate types such as equatorial and monsoon. Recent papers use paired statements, so the explanations give the reasoning behind each statement.
Explanations state facts as of the year each question was asked; words like “recently” refer to that year.
Showing 51–55 of 55 questions
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UPSC 1998Geography · Climatology
Q51. Consider the following climatic conditions (northern hemisphere):
Month
Temp. (°C)
Rainfall (cm)
J
3.9
4.7
F
4.4
5.7
M
8.3
8.2
A
14.4
9.2
M
20.0
9.2
J
23.3
17.7
J
27.8
14.5
A
27.8
14.0
S
22.3
12.7
O
18.3
7.0
N
12.2
5.0
D
6.7
3.5
These are most likely to be found in the natural regions of:
Explanation
The climate data provided, with moderate temperatures and distinct seasonal rainfall patterns, is more in line with the China-type climate found in parts of Eastern Asia. The temperature gradually increases from 3.9°C in January to 27.8°C in July and then decreases towards December. This shows warm summers and cool winters, which is characteristic of the China-type climate, where summers are typically hot and humid and winters are cold and dry.
UPSC 1998Geography · Climatology
Q52. Indonesian forest fire in 1997 was caused by:
Explanation
Option (d) is correct: The 1997 Indonesian forest fires were primarily caused by human activities like slash-and-burn agriculture to clear land for plantations, particularly for palm oil production. These fires escalated due to a lack of effective forest management practises. Options (a), (b) and (c) are incorrect:
The greenhouse effect refers to the trapping of heat in the Earth’s atmosphere by greenhouse gases, leading to global warming. While global warming can influence climate patterns, there is no direct evidence linking the greenhouse effect as the immediate cause of the 1997 fires. The ozone layer protects the Earth from harmful ultraviolet radiation. Its depletion is primarily associated with increased UV exposure. Ozone layer depletion does not have a direct connection to forest fires, including those in Indonesia in 1997. El Niño is a climatic phenomenon characterized by the warming of sea surface temperatures in the central and eastern Pacific Ocean, leading to significant weather changes globally. But it is not directly associated with Indonesian forest fires.
UPSC 1997Geography · Climatology
Q53. Daily weather map showing isobars is an example of:
Explanation
Option (b) is correct: An isopleth map is a type of thematic map that uses lines (isopleths) to connect points of equal value of a particular variable. These maps are ideal for visualizing data that changes gradually across a geographical area, like pressure. Lines (isopleths) link points of identical values, such as isobars (equal pressure), isotherms (equal temperature), or isoheights (equal altitude). Isobars, which are lines connecting points of equal atmospheric pressure, are a classic example of data visualized using an isopleth map. Options (a), (c) and (d) are incorrect:
A choropleth map uses different shades or colors to represent statistical data across predefined areas, such as population density by country or state. Chorochromatic Map also known as area-class maps, chorochromatic maps depict regions of different categories using various colors, often representing qualitative data like land use or vegetation types.For example a map showing different colors for various land cover types, such as forests, urban areas, and water bodies. Choroschematic maps simplify spatial relationships using schematic representations, often abstracting geographic details to highlight specific information. It may not adhere to strict geographic accuracy. Example: A transit map illustrating subway lines and stations without accurate geographic scaling.
UPSC 1996Geography · Climatology
Q54. Which one of the following layers of the atmosphere is responsible for the deflection of radio waves?
Explanation
The Ionosphere ranges from approximately 60 kilometers (37 miles) to 1,000 kilometers (620 miles) above the Earth. It is characterized by the presence of ions and free electrons. These electrically charged particles are created by solar radiation (primarily ultraviolet and X-rays) that ionizes the atmospheric gases. The ionosphere plays a crucial role in radio wave propagation. It contains several layers (D, E, F1, and F2), each with varying densities of ions and electrons. These layers can reflect radio waves, allowing them to travel far beyond the horizon. The ability of the ionosphere to reflect radio waves depends on the frequency of the radio waves and the state of the ionosphere (which varies with time of day and solar activity).
UPSC 1996Geography · Climatology
Q55. Given below are two statements one labelled as Assertion (A) and the other labelled as Reason (R). Assertion (A): Areas near the equator receive rainfall throughout the year. Reason (R): High temperatures and high humidity cause convectional rain in most afternoons near the equator. In the context of the above two statements, which one of the following is correct?
Explanation
Option (a) is correct:
Assertion (A) is true: The regions near the equator (such as the tropics) generally receive consistent rainfall through-out the year. This is due to the Intertropical Convergence Zone (ITCZ), where the trade winds from both hemispheres converge, leading to frequent cloud formation and rain. The high temperatures and constant moisture availability near the equator contribute to year-round rainfall. Reason (R) is true: In equatorial regions, intense solar heating during the day warms the Earth’s surface, causing water to evaporate and warm, moist air to rise. As the air ascends, it cools, leading to the condensation of water vapor and the formation of cumulonimbus clouds. This process triggers convectional rainfall, which typically occurs in the afternoon. R is the correct explanation of A: The high temperatures and humidity near the equator lead to convectional rainfall, which contributes to the consistent precipitation observed throughout the year in equatorial regions.
Answer key for these questions
Q
UPSC year
Correct answer
51
1998
(a) China type
52
1998
(d) None of these
53
1997
(b) Isopleth map
54
1996
(d) Ionosphere
55
1996
(a) Both A and Rare true and R is the correct explanation of A
What UPSC has tested in Climatology
Dewdrops are not formed on a cloudy night because clouds reflect back the Earth’s radiation and keep the surface warm.
Jet streams occur in both hemispheres, not only the Northern Hemisphere, and only some cyclones develop an eye.
The seasonal reversal of winds is the typical characteristic of the monsoon climate.
Leaf litter decomposes faster in the tropical rainforest than in any other biome.
Without the atmosphere, temperature on Earth would be well below freezing everywhere.
Frequently asked questions
How many previous year UPSC questions are there on Climatology?
This page covers 55 previous year UPSC Prelims GS Paper-I questions on Climatology (Geography), asked from 1996 to 2025. Each has the correct answer and an explanation.
Why are dewdrops not formed on a cloudy night?
Clouds reflect the Earth’s outgoing radiation back to the surface, so the ground does not cool enough to reach the dew point. On clear nights the ground loses heat freely, and dew forms.
Do jet streams occur only in the Northern Hemisphere?
No. Jet streams occur in both hemispheres. The polar front and subtropical jets blow west to east at high altitude in each hemisphere, so a statement limiting them to the Northern Hemisphere is incorrect.
Which climate is typified by a seasonal reversal of winds?
The monsoon climate. Winds blow from the sea to the land in summer, bringing rain, and from the land to the sea in winter, so the direction reverses with the season.
