Environment

With reference to Direct Air Capture, an emerging technology, which of the following statements is/are correct?
I. It can be used as a way of carbon sequestration.
II. It can be a valuable approach for plastic production and in food processing.
III. In aviation, it can be a source of carbon for combining with hydrogen to create synthetic low-carbon fuel.
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With reference to the role of biofilters in Recirculating Aquaculture System, consider the following statements:
1. Biofilters provide waste treatment by removing uneaten fish feed.
2. Biofilters convert ammonia present in fish waste to nitrate.
3. Biofilters increase phosphorus as nutrient for fish in water.
How many of the statements given above are correct?

In the context of WHO Air Quality Guidelines, consider the following statements :
1. The 24-hour mean of PM 2.5 should not exceed 15 μg/m3 and annual mean of PM 2.5 should not exceed 5 μg/m3.
2. In a year, the highest levels of ozone pollution occur during the periods of inclement weather.
3. PM 10 can penetrate the long barrier and enter the bloodstream.
4. Excessive ozone in the air can trigger asthma.

Which of the statements given above are correct?

“Biorock Technology” is talked about in which one of the following situations?

R2 Code of Practices’ constitutes a tool available for promoting the adoption of

Steel slag can be the material for which of the following?
1. Construction of base road
2. Improvement of agricultural soil
3. Production of cement
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In rural road construction, the use of which of the following is preferred for ensuring
environmental sustainability or to reduce carbon footprint?
1. Copper slag
2. Cold mix asphalt technology
3. Geotextiles
4. Hot mix asphalt technology
5. Portland cement
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In the context of which one of the following are the terms ‘pyrolysis and plasma gasification’ mentioned?

Which of the following is/are the possible consequence/s of heavy sand mining in riverbeds ?

1.Decreased salinity in the river
2.Pollution of groundwater
3.Lowering of the water-table
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In the context of solving pollution problems what is/are the
advantage/disadvantages of bioremediation technique?
1. It is a technique for cleaning up pollution by enhancing the same biodegradation process
that occurs in nature.
2. Any contaminant with heavy metals such as cadmium and lead can be readily and
completely treated by bioremediation using microorganisms.
3. Genetic engineering can be used to create microorganisms specifically designed for
bioremediation.
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