UGC NET Questions (Paper – 1)

Statements A, B, D, E and F are correct and together describe key sources, controls and dynamics of urban air pollution. Vehicular and industrial sources, construction and waste burning all add pollutants, while standards provide benchmarks for acceptable levels. Indoor biomass use and meteorological conditions influence overall exposure and dispersion. Statement C is clearly wrong because PM2.5 exposure is strongly associated with respiratory and cardiovascular diseases. Hence, the combination that includes all true statements and excludes C is A, B, D, E and F only.

Option A:
Option A is correct because it captures every true statement (A, B, D, E, F) and omits only C, which wrongly denies health impacts of PM2.5. It reflects a comprehensive picture of sources, health effects, standards and dispersion processes in urban air quality.

Option B:
Option B is incorrect as it leaves out E and F, ignoring the roles of indoor sources and weather conditions. Although A, B and D are true, this option provides an incomplete understanding of how urban air pollution is shaped and experienced.

Option C:
Option C is incorrect because it includes C, which claims that long-term PM2.5 exposure has no significant health effects. This contradicts epidemiological evidence, so the combination mixes correct and incorrect statements.

Option D:
Option D is incorrect since it omits statement A, thereby underplaying the importance of vehicular emissions as a major source. It also fails to mention that industrial and indoor sources plus weather dynamics all matter for urban air quality.

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.