41. Which one of the following is the most appropriate and correct practice from the point of view of a healthy environment? A. Burning of plastic wastes to keep the environment clean B. Burning of dry fallen leaves in a garden or field C. Treatment of domestic sewage before its release D. Use of chemical fertilisers in agricultural fields Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
42. Smog can be controlled by A. use of catalytic converters in automobiles B. setting the air-fuel ratio in engine in a such away to produce some CO and unburned hydrocarbons C. both of the above D. none of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
43. Which one of the following is not included in the National Air Quality Index? A. Sulphu B. Nitrogen dioxide C. Lead D. Methane Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
