91. Which type of radiations are absorbed by the upper layer of the atmosphere?
92. Sulphur dioxide level in the atmosphere can be reduced by using
93. The term 'brown air' is used for
94. The sewage obtained from water closets and urinals is known as
95. Which one amongst the following is not a Green House gas?
96. Which of the following is not a greenhouse gas ?
97. Which is abundant in Gobar gas?
98. Concentration of a material which is lethal to 50% animal is called
99. The major harmful gas emitted by automobile vehicle which causes air pollution is
100. The major harmful gas emitted by automobile vehicles which causes air pollution is
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