61. On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because
62. Which of the following dust collection equipments is the least efficient (for sub-micronic particles)?
63. Peroxyacyl nitrate (PAN), a pollutant is found in the
64. In water treatment, alum [Al2(SO4)3] is used for the process of
65. Out of the following, TLV of __________ is maximum (about 500 ppm).
66. During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.
67. Fine grit present in sewage is removed in the __________ during sewage treatment.
68. Septic tanks are used for the __________ of the deposited solids.
69. Average human body contains about __________ percent water by weight.
70. Maximum allowable concentration of CO2 in air for safe working is __________ ppm (parts per million).
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