Environmental (161-180)

Updated: Apr 26, 2020

161. The intensification of green house effect is attributed to the increased level of

carbon dioxide


162. Electrostatic precipitators are used as pollution control device for the separation of particulate matter


163. Select the secondary air pollutants among the following peroxy-acyl-nitrate (PAN) and ozone


164. The primary pollutant caused by incomplete combustion of organic matter is

carbon monoxide


165. Select the primary air pollutants among the following sulphur dioxide and nitrogen oxides


166. The specified standard under US Ambient Air Quality standards for S0, N0 and CO respectively are 80 μg/m³, 100 μg/m³, 10 mg/m³


167. The spray tower can be used to control a) gaseous pollutants only

b) particulate pollutants only


168. The specified standard for S0 under US Ambient Air Quality standards is 80

Ug/m³. This is approximately equivalent to 0.003 ppm


169. The depletion of ozone in the outer atmosphere may result in increased skin cancer cases


170. The rain is generally termed as acidic, if ph value of rain water falls below 5


171. The acid rains are caused by the following pollutants: S0₂ and N0₂


172. To express sound levels in decibels, sound pressure levels are usually adopted on a reference scale of 20 μPa


173: The permissible standards of air quality fixed in India for residental areas for

SPM, S0, NO and CO in μg/m³ respectively are 200,80,80,2000


174. The height of chimney required for effective disposal of 27 kg/hr of S02

emission is 42 m


175. If the actual height of a stack is 150 m and plume height is 8 m, then the effective height of the stack is 158 m


176. When the Adiabatic Lapse Rate (ALR) is more than Environmental Lapse Rate

(ELR), then the ELR can be called as sub adiabatic lapse rate


177. When Environmental Lapse Rate (ELR) is more than Adiabatic Lapse Rate (ALR), then the environment is said to be unstable


178. Temporary hardness in water is caused by the presence of bicarbonate of Ca and Mg


179. Blue baby disease (methemoglobinemia) in children is caused by the presence of excess nitrates


180. Two samples of water A and B have pH values of 4.4 and 6.4 respectively. How

many times more acidic sample A is than sample B? 100

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