Page 11 - Demo

11Environmental IssuesPresence of any harmful substance in the air is called pollution. Pollution is one of the biggest problems we are facing in today%u2019s age.Tick (3) the correct options.1.Noise pollution is measured in: a. hertzb. fathomsc. decibels2.Smog is a combination of:a.fireandwater%u0009b. smoke and fogc. water and smoke3.Maximum threat to the world is from:a. global warmingb. ozone holec. soil erosion4.Acid rain is caused due to increase in concentration of:a. SO2 and NO2b. CO and CO2c. CO and SO35.Pollutant from motorcar exhaust that causes mental diseases is:a. leadb. NO2c. Hg6.The main source of water pollution is:a. sewage waterb. rainwaterc. well water7.The gas mainly responsible for greenhouse effect is:a. O2b. H2c. CO28.The disease which is not caused by water pollution is:a. Typhoidb. Jaundicec. Malaria9.Secondary air pollutant is:a. ozoneb. carbon dioxidec. nitrogen dioxide10.Spraying of DDT on crops causes pollution of:a. soil and waterb. air and soilc. crops and air11.The intensity of sound regarded as safe noise level for a city is:a. 80 dBb. 45 dBc. 120 dB12.Natural source of pollution is:a. rainforestb. mining%u0009 c.forestfire%u0009%u0009 13.%u0009 Reduce,reuseandrecycleprinciplebywhichwastescanbereducedisclassifiedas:a. waste organizerb. REc. 3R%u0009 14.%u0009 Wastewhichtakes3to4weekstodecomposeinlandfillis:a. banana peelb. wooden logc. leather shoe7