91. Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?
92. The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water.
93. The pH value of oxidised sewage is about
94. Industrial workers working in leather tanning & manufacturing units are prone to suffer from
95. Which of the following acts as a natural source of air pollution?
96. Which of the following is not a natural source of air pollution?
97. Which of the following is the most detrimental for water used in high pressure boiler?
98. A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.
99. Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to
100. TLV of mercury in potable (drinking) water is about __________ ppm.
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