UGC NET Questions (Paper – 1)

The Air Quality Index (AQI) is designed to simplify complex air quality data by translating pollutant concentrations into a single scale with associated health categories. It helps citizens understand whether air is good,moderate or hazardous on a given day. The stem describes a composite indicator that communicates air quality status,which matches the AQI. Thus Air Quality Index is the correct term.

Option A:
An emission inventory is a detailed list of pollutants released from various sources over a period. It is used for planning and modelling,but it does not directly provide a simple public facing status index as described in the question.

Option B:
Air Quality Index values are calculated using sub indices for pollutants like PM2.5,PM10, NO₂ and O₃ and then reporting the worst as the overall index. This method allows a quick health oriented interpretation. These features align with the stem’s emphasis on a single number and category.

Option C:
Stack height refers to the physical height of chimneys used to disperse pollutants more widely. It is an engineering design parameter,not an information tool for the public.

Option D:
Particulate factor is not a standard term for summarising air quality. While particulates are important pollutants, their levels alone do not create the overall air quality category mentioned in the question.

Statements A, B, C and E are correct because standards exist for air, water and noise, and regular monitoring is required to see whether actual conditions meet these limits. Statement D is false, since even legally binding standards require regulatory institutions, penalties and compliance mechanisms to be effective. Statement F is false too because public disclosure of data supports transparency and can create pressure for better enforcement. Therefore, the set that keeps A, B, C and E while excluding D and F is correct.

Option A:
Option A is incorrect as it omits E and thereby ignores the crucial role of monitoring in making standards meaningful. Without E, there is no way to check compliance systematically.

Option B:
Option B is incorrect since it leaves out C, thus failing to mention noise standards, which are part of environmental quality frameworks, especially in urban areas.

Option C:
Option C is incorrect because it includes D, which wrongly suggests that standards never need enforcement mechanisms. Including D mixes a clearly false claim with correct statements.

Option D:
Option D is correct as it retains all the true statements about what standards are and how they are applied, while rejecting the idea that enforcement and public information do not matter.

Non-point source pollution comes from many small, diffuse sources spread over a landscape rather than a single discharge point. Agricultural fields treated with fertilisers and pesticides generate runoff during rainfall that carries chemicals into streams and rivers, making it hard to attribute pollution to any one farm.

Option A:
Option A is correct because it involves numerous fields contributing pollutants in a widespread way, which is characteristic of non-point source pollution.

Option B:
Option B is incorrect since a factory outfall pipe is a classic point source with a clearly identifiable location and discharge.

Option C:
Option C is incorrect because a sewage treatment plant outlet is also a discrete point source, even if the effluent is inadequately treated.

Option D:
Option D is incorrect as a thermal power plant outfall is a specific, regulated point source, not diffuse pollution from many locations.

Statements A, B and D are correct because ICT tools like remote sensing and GIS help monitor environmental change, ICTs improve information flows and green technologies need supportive policies and capacities. Statement C is incorrect as technology does not guarantee sustainability; outcomes depend on design, context and use. Hence, the combination A, B and D only is correct.

Option A:
Option A is incomplete because it omits D, which rightly emphasises that enabling policies and capacity building are essential for adoption of environment-friendly technologies. Without D, the role of governance and institutions is underestimated.

Option B:
Option B is incorrect because, although B and D are true, it leaves out A which reflects one of the most important environmental applications of ICT, namely remote sensing and GIS. The combination is therefore only partially correct.

Option C:
Option C is correct since it selects the three true statements and excludes C, which wrongly assumes automatic sustainability from any new technology. It aligns with a critical understanding of technology–environment relationships.

Option D:
Option D is incorrect as it includes C along with the true statements. Accepting C implies that the mere presence of technology ensures sustainability, which is conceptually flawed.