41. Pollution by particulate matter emission in the atmosphere does not take place during metal
42. Pick out the correct statement.
43. Main pollutant present in automobile exhaust is
44. Biological oxidation ponds remove organic matters present in the polluted water by
45. High noise levels produced during operation of fans and compressors can be reduced by using
46. Pick out the wrong statement.
47. Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is
48. Fresh sewage is __________ in nature.
49. Threshold limit value (TLV) of CO in air is __________ ppm.
50. Photochemical smog is formed from automobile exhaust
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