Prelims

Which of the following can be found as pollutants in the drinking water in some parts of India?
(1). Arsenic
(2). Sorbitol
(3). Fluoride
(4). Formaldehyde
(5). Uranium
Select the correct answer using the codes given below.

Photochemical smog is a resultant of the reaction among

Lead, ingested or inhaled, is a health hazard. After the addition of lead to petrol has been banned, what still are the sources of lead poisoning? 1. Smelting units 2. Pens and pencils 3. Paints 4. Hair oils and cosmetics Select the correct answer using the code given below:

Consider the following statements: Chlorofluorocarbons, known as ozone depleting substances, are used 1. In the production of plastic foams 2. In the production of tubeless tyres 3. In cleaning certain electronic components 4. As pressurizing agents in aerosol cans Which of the statements given above is/are correct?

Consider the following: 1. Carbon dioxide 2. Oxides of nitrogen 3. Oxides of Sulphur Which of the above is/are the emission/emissions from coal combustion at thermal power plants?

There is a concern over the increase in harmful algal blooms in the seawater of India. What could be the causative factors for this phenomenon?
1. Discharge of nutrients from the estuaries.
2. Run-off from the land during the monsoon.
3. Upwelling in the seas.

Due to their extensive rice cultivation, some regions may be contributing to global warming. To what possible reason/reasons is this attributable?
1. The anaerobic conditions associated with rice cultivation cause the emission of methane.
2. When nitrogen based fertilizers are used, nitrous oxide is emitted from the cultivated soil.
Which of the statements given above is/are correct?

What is Bisphenol A (BPA)?

Which of the above are sources of methane, a major greenhouse gas?

Which one of the following is produced during the formation of photochemical smog?