UGC NET Questions (Paper – 1)

Stratospheric ozone absorbs much of the Sun’s harmful UV-B radiation; when the ozone layer thins, more UV-B reaches the surface, increasing risks of skin cancers, cataracts and immune system suppression.

Option A:
Correct; it directly links ozone depletion to greater UV-B exposure and the associated health effects such as skin cancer and cataracts.

Option B:
Incorrect; indoor air pollution is mainly caused by fuels and ventilation conditions, not by changes in the ozone layer.

Option C:
Incorrect; tectonic activity and earthquakes are unrelated to atmospheric ozone levels.

Option D:
Incorrect; ozone depletion does not cause greenhouse gases to disappear; ozone issues and climate change are distinct though related problems.

Sanitation includes safe disposal of human excreta and waste water to protect health and the environment. Providing toilets and eliminating open defecation reduce contamination of soil and water and break disease transmission pathways. The stem clearly describes such actions,so sanitation is the appropriate term. Therefore Option D is correct.

Option A:
Aesthetics may improve indirectly,but the primary purpose of toilets is hygiene and health,not appearance.

Option B:
Production relates to economic output and is not the primary objective of ending open defecation.

Option C:
Commerce concerns trade and business activity and does not capture the hygiene and disease prevention focus here.

Option D:
Sanitation directly refers to safe excreta disposal and improved hygiene through toilets,matching the stem precisely.

Statements A and B are correct because active transport improves health and transport-related air pollution is linked with respiratory and cardiovascular problems. Statement C is wrong since road design, crossings and traffic calming are crucial for pedestrian and cyclist safety. Statement D is also false as health impact assessments are increasingly used in major transport projects. Therefore, the combination A and B only is the correct answer.

Option A:
Option A is correct since it captures the two accurate statements while excluding C and D, both of which deny established links between planning, safety and health assessments. It reflects the role of both physical activity promotion and pollution control in transport policy.

Option B:
Option B is incorrect because it adds C to A and B, thereby accepting the claim that road design has no link with safety. This contradicts road safety science and practice, so the option cannot be accepted.

Option C:
Option C is incorrect as it groups B, C and D. While B is true, C and D are false, so this combination mixes correct and incorrect statements and fails to represent the set of correct statements.

Option D:
Option D is incorrect because it assumes all four statements are correct, thereby endorsing C and D. Since both are wrong, the entire combination becomes invalid.

Indian biomedical waste management rules prescribe colour-coded containers for different categories of waste to ensure safe handling and treatment. Human anatomical waste, such as body parts and organs, is typically placed in yellow containers or bags destined for incineration or deep burial. The yellow colour alerts handlers to the infectious and sensitive nature of the waste. Thus, identifying the yellow container for this category is consistent with the guidelines.

Option A:
Option A is incorrect because blue containers are generally used for waste like broken glassware and metallic body implants, not for human anatomical waste. Mixing these categories would create handling and treatment problems.

Option B:
Option B is correct as yellow bags or containers are standard for highly infectious and pathological waste. This segregation helps ensure that such waste receives appropriate high-temperature treatment to neutralise pathogens.

Option C:
Option C is incorrect since red containers are typically assigned to contaminated recyclable waste such as tubing, bottles and IV sets. They are not used for anatomical waste under standard protocols.

Option D:
Option D is incorrect because green bins are often associated with general non-hazardous or biodegradable waste in many institutional settings. Using them for anatomical waste would defeat the purpose of clear risk signalling.

Fine particulates with diameters less than 2.5 micrometres can bypass the upper respiratory defences and reach the deepest parts of the lungs. From there, some particles or their components can move into the bloodstream. These processes are associated with inflammation, aggravated asthma, heart attacks and other serious health outcomes. Hence, the main reason PM2.5 is considered particularly harmful is its ability to penetrate deeply and affect multiple organ systems, as stated in Option C.

Option A:
Option A is incorrect because many PM2.5 particles are too small to be seen with the naked eye. Their danger lies in their invisibility and ability to reach deep into the lungs, not just in causing eye irritation.

Option B:
Option B is incorrect because fine particles do not simply settle quickly; they can remain suspended in the air for long periods and be easily inhaled. Their persistence in the air increases the duration and likelihood of exposure.

Option C:
Option C is correct as it identifies the key health pathway: deep penetration into the respiratory tract and possible entry into the bloodstream. This ability to affect both the lungs and the cardiovascular system makes PM2.5 especially hazardous.

Option D:
Option D is incorrect since PM2.5 can contain toxic metals, organic compounds and secondary aerosols. These components are far from harmless and have well-documented long-term health impacts.

An ambient air quality standard specifies the maximum acceptable concentration of a pollutant in outdoor air over a defined time period. These standards are set to protect human health and the environment. The stem clearly refers to such permissible limits,so standard is the correct word.

Option A:
An inventory is a detailed list or accounting of emission sources and quantities. While useful for management,it does not itself state permissible limits or health based thresholds. Hence it is not suitable for the blank.

Option B:
A standard is a legally or administratively established benchmark against which actual air quality is compared. Ambient air quality standards guide regulatory action and monitoring. This is exactly what the stem describes,so this option is accurate.

Option C:
A profile usually means a descriptive representation of air quality conditions or emissions but does not inherently define acceptable limits. Therefore it is not equivalent to the concept in the question.

Option D:
A budget in environmental science may refer to the balance of emissions and removals of a pollutant or greenhouse gas. It is different from health based concentration limits,so it cannot fit the blank.

Waterborne diseases such as diarrhoea, cholera and typhoid spread mainly through ingestion of water contaminated with human or animal waste. In crowded settlements, breaking this transmission route requires reliable access to microbiologically safe drinking water and effective removal and treatment of sewage. When these systems function together, they significantly reduce pathogen loads in the environment and improve public health outcomes.

Option A:
Option A is incorrect because individual bottled water use by a few does not address community-wide contamination and is often unaffordable; it leaves systemic sanitation problems unsolved.

Option B:
Option B is correct as it tackles both the supply of safe water and the safe disposal of excreta, which is the foundation of modern public health engineering.

Option C:
Option C is incorrect since storing wastewater in open containers creates breeding grounds for disease vectors and increases exposure risks.

Option D:
Option D is incorrect because open defecation near water bodies directly contributes to faecal contamination and is a major cause of waterborne disease outbreaks.

Statement D is the only wrong statement because higher urban temperatures clearly affect public health through heat stress and increase energy demand for cooling. Statements A, B and C correctly describe what the urban heat island is and outline mitigation and adaptation measures such as greening and heat action plans. Heat-related morbidity and mortality have been documented for vulnerable city populations. Therefore, identifying D alone as wrong is the correct choice.

Option A:
Option A is correct because it isolates D as the single incorrect statement while treating A, B and C as valid. It recognises that urban heat has serious health and energy implications and that planning must address these. This option matches the requirement to select the wrong statement or statements.

Option B:
Option B is incorrect as it treats both A and D as wrong. Statement A correctly defines the urban heat island phenomenon and is widely used in urban climate studies. Including A among wrong statements shows a misunderstanding of the basic concept.

Option C:
Option C is incorrect because it groups B and D as wrong. While D is wrong, B is correct since green infrastructure is a recognised strategy for cooling cities. Misclassifying B undermines accepted adaptation measures.

Option D:
Option D is incorrect as it treats C and D as wrong together. C accurately identifies heat action plans, early warning and cooling centres as important adaptation measures. Including C among wrong statements makes this option unacceptable.

Statements A, B and D are correct: active transport reduces emissions and improves health, heavy reliance on private vehicles increases multiple problems and mixed land-use planning can shorten trips. Statement C is incorrect because bus rapid transit systems are generally introduced to improve efficiency and reduce emissions per passenger kilometre, not increase them. So the combination A, B and D only is correct.

Option A:
Option A is correct as it brings together all the true statements while excluding C, which misrepresents the purpose and impact of bus rapid transit. It reflects integrated thinking about transport, environment and health.

Option B:
Option B is incomplete because it omits D, which rightly points to the role of land-use planning in reducing travel distances and emissions.

Option C:
Option C is incorrect since it includes C, endorsing the false claim that bus rapid transit always raises emissions, contradicting empirical findings from many cities.

Option D:
Option D is incorrect as it combines A and D with C, again treating C as correct and leaving out B, which is a key statement about private motorised transport impacts.

Statements C and D are wrong, whereas A and B are correct. Statement C is incorrect because indoor air pollution is a major concern in many rural households that use solid fuels such as wood, dung or crop residues for cooking. Statement D is also incorrect because air quality standards are framed primarily to protect human health, although they may also consider welfare, vegetation and materials. Therefore, the correct answer must identify both C and D as wrong statements together.

Option A:
Option A is incorrect because it singles out C only as wrong while ignoring D. Although C is indeed wrong, D is also an incorrect statement since air quality standards explicitly aim to protect human health. Because the question asks for all wrong statements, excluding D makes this option incomplete.

Option B:
Option B is incorrect because it selects D only as the wrong statement and treats C as correct. As indoor air pollution is a serious health issue in many rural areas of developing countries, statement C cannot be accepted as true. Leaving out C from the set of wrong statements makes this option unacceptable.

Option C:
Option C is incorrect because it claims that A, C and D are wrong. Statements C and D are wrong, but statement A is correct because fine particulate matter (PM2.5) can indeed penetrate deep into the respiratory system and reach the bloodstream. Including a correct statement among wrong ones invalidates this combination.

Option D:
Option D is correct because it accurately identifies C and D as the wrong statements and excludes A and B, which are scientifically valid. It recognises that indoor air pollution is a serious rural health issue and that air quality standards serve to protect human health. Hence this combination fully satisfies the requirement of selecting the wrong statements.

Blue baby syndrome occurs when high nitrate in drinking water is converted to nitrite in the infant’s body, which then reacts with haemoglobin to form methemoglobin. Methemoglobin cannot carry oxygen effectively, causing cyanosis and potentially serious health effects. Infants are particularly vulnerable because their digestive and enzymatic systems are not fully developed. Therefore, excessive nitrate in drinking water is the main contaminant associated with this condition.

Option A:
Option A is correct because it identifies nitrate as the crucial contaminant that can lead to methemoglobinemia, especially when levels exceed safe standards. Many rural areas with intensive fertiliser use face this risk when wells are contaminated.

Option B:
Option B is incorrect since fluoride in excess causes dental and skeletal fluorosis, not blue baby syndrome. Its health effects are different and relate mainly to bones and teeth.

Option C:
Option C is incorrect because calcium hardness is not associated with cyanosis or impaired oxygen transport. Hard water may cause scaling but is not the cause of methemoglobinemia.

Option D:
Option D is incorrect; high dissolved oxygen is generally beneficial for aquatic life and has no link to blue baby syndrome in humans. Oxygen deficiency, not excess, is usually a problem in polluted water.