General Science PYQ – Environment and Ecology – Part 2 (Q 35–68)
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General Science PYQ – Environment and Ecology – Part 2 (Q 35–68) – 26 questions, subject: Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.
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1.
CSSS 2023
Which one of the following devices is used for controlling particulate emission at power plants, cement and paper mills?Correct Answer: A [Electrostatic precipitator]
Explanation:
An electrostatic precipitator removes particulate matter from flue gases of power plants, cement and paper mills using a high voltage field.
2.
GSCE 2021
Name the application recommended by the Central Pollution Board of India to know about the "quality of air"Correct Answer: A [Sameer]
Explanation:
SAMEER is the mobile application of the Central Pollution Control Board that gives the air quality index of cities.
3.
(a) Pesticide residues – 1. Global warming
(b) Nitrogen dioxide – 2. Biomagnification
(c) Carbondioxide – 3. Blue baby syndrome
(d) Nitrate in drinking water – 4. Respiratory disorders
Junior Analyst 2023
Match the following:(a) Pesticide residues – 1. Global warming
(b) Nitrogen dioxide – 2. Biomagnification
(c) Carbondioxide – 3. Blue baby syndrome
(d) Nitrate in drinking water – 4. Respiratory disorders
Correct Answer: D [2 4 1 3]
Explanation:
Pesticide residues cause biomagnification, nitrogen dioxide respiratory problems, carbon dioxide global warming and nitrate in drinking water blue baby syndrome, giving 2 4 1 3.
4.
AD Co-operation 2022
Minamata disease, a neurological disorder affecting human beings, is caused by the pollutantCorrect Answer: C [Mercury]
Explanation:
Minamata disease is a neurological disorder caused by methyl mercury from industrial waste accumulating in fish in Minamata Bay, Japan.
5.
EO Group VII (HR&CE) 2022
Thermal pollution in a water resource mainly reduces the concentration ofCorrect Answer: B [Dissolved oxygen]
Explanation:
Thermal pollution raises water temperature, which lowers dissolved oxygen and harms aquatic life.
6.
CTS (Interview Posts) 2024
BOD (Biological Oxygen Demand) measures theCorrect Answer: D [Amount of oxygen required for bacteria to decompose organic matter in water samples in fixed time and temperature]
Explanation:
BOD is the amount of oxygen required by microorganisms to decompose organic matter in water, usually measured over 5 days at 20 degrees C.
7.
Group 1/1A 2025
The biological oxygen demand is the amount of dissolved oxygen required by _____ in water.Correct Answer: A [Microbes]
Explanation:
BOD is the dissolved oxygen needed by microbes (bacteria) to decompose organic matter in water.
8.
Group 1 2024
Eutrophication leads to the death of fish due toCorrect Answer: D [Decreasing O2 content]
Explanation:
Dead algae decompose using up dissolved oxygen, so decreased oxygen content kills fish in eutrophic water.
9.
Reason [R]: Since they easily spread and cover the entire surface and blocked the water ways.
ARGS 2020
Assertion [A]: The free floating hydrophytes Eichhornia and Salvinia in the aquatic bodies are problematic.Reason [R]: Since they easily spread and cover the entire surface and blocked the water ways.
Correct Answer: B [[A] True [R] True]
Explanation:
Free-floating hydrophytes like Eichhornia and Salvinia spread rapidly, cover the water surface and cut off light and oxygen, so both statements are true.
10.
Asst. Conservator of Forests 2023
Which among the following is known as "Terror of Bengal"?Correct Answer: B [Eichhornia Plant]
Explanation:
Water hyacinth (Eichhornia crassipes) spreads uncontrollably in water bodies, so it is called the Terror of Bengal.
11.
AGGS 2021
The method used to determine the (dose of) polymer to be used for a water treatment plant isCorrect Answer: A [JAR test]
Explanation:
The jar test, comparing different doses in a series of jars, determines the optimum dose of coagulant or polymer for a water treatment plant.
12.
Group 1B/1C 2024
The acceptable limit of free residual chlorine in drinking water as per CPCB (India) standards.Correct Answer: C [0.2 mg/l]
Explanation:
Free residual chlorine of at least 0.2 mg per litre must remain in drinking water to prevent re-contamination in the pipelines.
13.
2(CH₂O) → CO₂(g) + CH₄(g)
The above equation represents
Executive Officer Gr. I (HR&CE) 2024
The biodegradation process, breaks down biomass either in the presence of aerobic respiration or anaerobic respiration.2(CH₂O) → CO₂(g) + CH₄(g)
The above equation represents
Correct Answer: C [Anaerobic process]
Explanation:
The reaction 2(CH2O) giving CO2 + CH4 occurs without oxygen, so it is anaerobic decomposition, as in biogas formation.
14.
GSASO 2020 · CSSS 2023
Chipko andolan is related withCorrect Answer: B [Forest conservation]
Explanation:
The Chipko movement (1973) in Uttarakhand involved villagers hugging trees to stop felling, so it concerns forest conservation.
15.
AAO & AHO 2024
Van Mahotsav involvesCorrect Answer: B [Protecting trees]
Explanation:
Van Mahotsav is a tree-planting festival held in the first week of July, started in 1950 by K.M. Munshi, to promote protection of trees.
16.
GSASO 2020
Plant-diversity position in world and Asia is _____ respectively.Correct Answer: A [10 and 4]
Explanation:
India ranks 10th in the world and 4th in Asia in plant diversity.
17.
CTS (Interview Posts) 2024
RED DATA Book is published byCorrect Answer: A [International union for conservation of nature]
Explanation:
The Red Data Book, listing threatened species, is published by the International Union for Conservation of Nature (IUCN).
18.
VCGS 2022
What is the role of CITES organisation?Correct Answer: B [Prevention of trading of endangered biota]
Explanation:
CITES, the 1973 convention on international trade in endangered species of wild fauna and flora, prevents trade in endangered organisms and their products.
19.
Junior Rehabilitation Officer 2023
Globally wetlands are conserved with the designation of _____ which was signed in Iran, 1971.Correct Answer: A [Ramsar sites]
Explanation:
The international wetland conservation treaty signed at Ramsar, Iran in 1971 designates wetlands as Ramsar sites.
20.
GSHA 2021
The floating national park is situated inCorrect Answer: B [Manipur]
Explanation:
Keibul Lamjao, the world's only floating national park, lies on Loktak Lake in Manipur and is made of floating phumdis.
21.
Accounts Officer (Treasury) 2022
The Zoological survey of India has recommended to tag which of these turtles along the Rushikulya river mouth in Ganjam district for studying the migration route of these endangered speciesCorrect Answer: C [Olive Ridley Turtle]
Explanation:
The Rushikulya river mouth in Ganjam, Odisha is a mass nesting site of Olive Ridley turtles, which are tagged to study their migration.
22.
Asst. Public Prosecutor Gr. II 2025
Which among the following is identified as the most potential drug used in livestock and is responsible for the decline of vulture population in India?Correct Answer: B [Diclofenac]
Explanation:
Diclofenac, a painkiller given to livestock, caused kidney failure in vultures that fed on the carcasses and led to their decline in India.
23.
CTS (Non-Interview Posts) 2025
The pesticide which is banned (completely) in Kerala and Karnataka isCorrect Answer: C [Endosulfan]
Explanation:
Endosulfan, an organochlorine pesticide that caused serious health damage in Kasaragod, was banned completely in Kerala and Karnataka, and nationwide by the Supreme Court in 2011.
24.
Asst. Conservator of Forests 2023
India also joined other nations in announcing a net zero emissions target by the yearCorrect Answer: A [2070]
Explanation:
At the COP26 Glasgow summit in 2021, India announced the target of net zero emissions by 2070.
25.
Junior Analyst 2023
The 68th UN General assembly declared _____ year as the international year of soils.Correct Answer: C [2015]
Explanation:
The 68th UN General Assembly declared 2015 as the International Year of Soils.
26.
(1) Zero Hunger
(2) Good Health
(3) No Poverty
(4) Quality Education
Group 1 2024
Arrange the following Sustainable Development Goals by UNO:(1) Zero Hunger
(2) Good Health
(3) No Poverty
(4) Quality Education
Correct Answer: C [(3), (1), (2), (4)]
Explanation:
The first SDGs in order are No Poverty, Zero Hunger, Good Health and Well-being and Quality Education, i.e. (3), (1), (2), (4).
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Here you get the answer with a one-line explanation. TNPSC பொது அறிவு அலகு II இந்தியப் புவியியல் முழுவதும் · 14 அத்தியாயங்கள் · 340 பயிற்சி வினாக்கள் விளக்கத்துடன் · 2 மாதிரித் தேர்வுகள் (100 வினாக்கள்) · வரைபடங்கள், 14 மனவரைபடங்கள் · ஒவ்வோர் அத்தியாயத்திலும் தமிழ்நாடு பார்வை
Get the book – ₹299 More quizzes
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› General Science PYQ – Genetics, Evolution and Biotechnology – Part 1 (Q 1–26)
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