Prelims

There is some concern regarding the nanoparticles of some chemical elements that are used by the industry in the manufacture of various products. Why?
1. They can accumulate in the environment and contaminate water and soil.
2. They can enter the food chains.
3. They can trigger the production of free radicals.
Select the correct answer using the code given belowBrominated

Brominated flame retardants are used in many household products like mattresses and
upholstery. Why is there some concern about their use?
1. They are highly resistant to degradation in the environment.
2. They are able to accumulate in humans and animals.
Select the correct answer using the code given below:

Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth?
1. Volcanic action
2. Respiration
3. Photosynthesis
4. Decay of organic matter
Select the correct answer using the code given below.

Due to improper/indiscriminate disposal of old and used computers or their parts, which of the
following are released into the environment as e-waste?
(1). Beryllium
(2). Cadmium
(3). Chromium
(4). Heptachlor
(5). Mercury
(6). Lead
(7). Plutonium
Select the correct answer using the codes given below.

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.