Global warming

Global warming is a Environment concept from the MPSC syllabus, tested in 13 past MPSC questions across 7 exam years between 2013 and 2025. Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.

Real questions

Years tested

7 · 2013–2025

In context

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Asked in

2025 2024 2023 2021 2019 2014 2013

What you need to know first

Basic greenhouse effectEl Nino phenomenonSolar radiationAtmospheric GasesSources of water and air pollutionBasic physics of heatAtmospheric scienceBasic environmental scienceGreenhouse effectGreenhouse effect basics

What mastering this unlocks

Carbon SequestrationClimate mitigation

Real questions that test this

For the past few centuries Earth has been witnessing several environmental problems even-though the ongoing climate change events such as increasing temperature, cloud bursts, frequent cyclones, long and irregular winters and drought have received more attention in the public platforms. These extreme climatic events have challenged the physical, mental and economic health of humans and made them to think and speak out. This realisation has been following by several agencies making efforts to mitigate the climate change impacts. It is known that global warming is the result of the incessant release of greenhouse gases especially carbon dioxide (CO₂) from several sectors especially from automobile and associated industries triggering the extreme climatic events. Earlier the natural forests cover and oceans absorbed the enormous quantities of CO₂ released in the environment. However, continuous deforestation and other anthropogenic pressures prevailing in and around the ocean and forest have slowed down the carbon sequestration potential of these systems. Natural forests evolve due to the constant interplay of inter and intra species alongwith unique environmental conditions and play an important role in mitigating the greenhouse gases to a large extent, also acting as oxygen factories. However, in comparison, tropical and savannah forests produce a more oxygen than other forests. Studies have established that the natural regeneration potential of the forest has been decreasing due to continuous deforestation. Ecologists opine that the restoration of natural forests is the ideal way to overcome the global warming impacts. However, restoration of natural forest is a herculean task and almost impossible. The diminishing forest cover affects the life-forms and also carbon storage and oxygen production which might speed-up the global warming process, and so researchers and policymakers encourage afforestation programmes in order to mitigate the global warming.

वनसंपदा (वने) व महासागराची कार्बन पृथक्करण (अधिशोषणात) क्षमता ढासळत गेलेली कारण :

(a)वन आवर्णात वाढ

(b)जंगलतोड

(c)वृक्षरोपण उपक्रम

(d)मानवनिर्मित कार्ये

1)फक्त (a) व (b)

2)फक्त (b) व (d)✓ Correct

3)फक्त (a) व (c)

4)फक्त (b) व (c)

Deforestation (b) and anthropogenic/man-made activities (d) destroy forest covers and marine balance, directly causing a decline in the carbon sequestration capacity of forests and oceans.

हरितगृह वायुच्या परिणामा च्या संदर्भातील विधाने अ. 1970 पर्यंत आपल्या पृथ्वीचे 100 वर्षात 1° से. ने तापमान वाढत होते. ब. गेल्या 20 वर्षात आपल्या पृथ्वीचे दर 100 वर्षात 10° से. ने तापमान वाढत आहे. क. जगाच्या निरनिराळ्या भागातील बहुतेक हिमनदया मागे सरकत आहेत. ड. एल नीनोची वारंवारता व परिणामाची तीव्रता वाढत आहे. वरील विधाना पैकी कोणते/कोणती विधाने बरोबर आहेत ? Study the following statements about Greenhouse gases effect. a. Our planet was heating at the rate of 1°C per 100 years, till 1970. b. Since last 20 years, the planet has been warming at the rate of 10°C per 100 years. c. Most of the glaciers in different parts of the world are retreating. d. Frequency and effect of El Niño is increasing. Which of the above statements is/are correct ?

(a)1970 पर्यंत आपल्या पृथ्वीचे 100 वर्षात 1° से. ने तापमान वाढत होते. / Our planet was heating at the rate of 1°C per 100 years, till 1970.

(b)गेल्या 20 वर्षात आपल्या पृथ्वीचे दर 100 वर्षात 10° से. ने तापमान वाढत आहे. / Since last 20 years, the planet has been warming at the rate of 10°C per 100 years.

(c)जगाच्या निरनिराळ्या भागातील बहुतेक हिमनदया मागे सरकत आहेत. / Most of the glaciers in different parts of the world are retreating.

(d)एल नीनोची वारंवारता व परिणामाची तीव्रता वाढत आहे. / Frequency and effect of El Niño is increasing.

1)फक्त अ आणि ब बरोबर / Only a and b are correct

2)फक्त क आणि ड बरोबर / Only c and d are correct

3)फक्त ब बरोबर / Only b is correct

4)फक्त अ, क आणि ड बरोबर / Only a, c and d are correct✓ Correct

Statements a, c, and d are correct reflecting historical global warming rates, glacier retreat, and increased El Niño frequency. Statement b cites an incorrect exaggerated rate (10°C per 100 years).

खाली दोन विधान दिलेली आहेत (अ) हे विधान असून (र) हे कारण आहे खालील पर्यायातून योग्य पर्याय निवडा. विधान (अ) : निर्वणीकरणामुळे हवेतील कार्बनडायऑक्साईड चे प्रमाण वाढते. कारण (र) : वने जेंव्हा प्रकाशसंश्लेषण क्रियेदारे स्वतःचे अन्न तयार करतात तेंव्हा मोठ्या प्रमाणात कार्बनडायऑक्साईड चा वापर होतो.

(a)निर्वणीकरणामुळे हवेतील कार्बनडायऑक्साईड चे प्रमाण वाढते.

(b)वने जेंव्हा प्रकाशसंश्लेषण क्रियेदारे स्वतःचे अन्न तयार करतात तेंव्हा मोठ्या प्रमाणात कार्बनडायऑक्साईड चा वापर होतो.

1)(अ) आणि (र) दोन्ही सत्य असून (र) हे (अ) चे बिनचूक स्पष्टीकरण आहे.✓ Correct

2)(अ) आणि (र) दोन्ही सत्य असून (र) हे (अ) चे बिनचूक स्पष्टीकरण नाही.

3)(अ) सत्य असून विधान (र) असत्य आहे.

4)(अ) असत्य असून विधान (र) सत्य आहे.

Deforestation increases carbon dioxide because trees absorb CO2 during photosynthesis. Removing forests means less CO2 is absorbed, raising its atmospheric concentration. Thus, both are true and (R) is the correct explanation.

मातीतील नायट्रोजन खत जिवाणूंद्वारे तोडल्यास ______ मुक्त होते. Nitrogen fertilizers in soils releases ______ when broken down by bacteria.

a)नायट्रोजन डायऑक्साइड (NO2) / Nitrogen dioxide (NO2)

b)नायट्रस ऑक्साइड (N2O) / Nitrous oxide (N2O)

c)नायट्रोजन ट्रायऑक्साइड (NO3) / Nitrogen trioxide (NO3)✓ Correct

d)नायट्रोजन (N2) / Nitrogen (N2)

When nitrogenous fertilizers in the soil are broken down by denitrifying bacteria, Nitrous oxide (N2O) is released, which is a potent greenhouse gas.

कोणत्या वायूमुळे मुख्यत्वे ओझोन थराचा हास होतो ? / The main gas responsible for ozone depletion is :

1)कार्बन डाय ऑक्साईड / Carbon dioxide

2)नायट्रोजन डाय ऑक्साईड / Nitrogen dioxide

3)मिथेन / Methane

4)क्लोरो फल्यूरो कार्बन / Chloro fluro carbon✓ Correct

Chlorofluorocarbons (CFCs) release chlorine atoms upon UV exposure, which actively break down ozone molecules in the stratosphere, causing depletion.

More Environment concepts

Greenhouse gases Deforestation Agricultural Economics Biodiversity hotspots Climate Change SONAR Human Development Air Pollution Biosphere Reserves Carbon footprint Montreal Protocol National Parks

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