Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds ______________ percent (by volume)?

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Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in ‘gas chamber’ is about ______________ ppm?

A. < 1 B. 10-100 C. 100-200 D. 100-1000...

Pick out the wrong statement?

A. Biological oxygen demand (BOD) is a characteristic and not a constituent of water B. BOD is a measure of the amount of oxygen which will be demanded & used in 5 days by the biological decomposition of the organic matter present in water stream present as food for the living organism C. BOD is … Pick out the wrong statement?Read More...

Green house effect is accentuated by________________?

A. Deforestation B. Rapid industrialisation C. Increased transportation activity D. All A., B. and C....

Color test of water is done with an instrument called__________________?

A. Tintometer B. Colorimeter C. Electro-chemical cell D. Turbidimeter...

Carbon monoxide is a pollutant, which causes_________________?

A. Respiratory disease (e.g. asthma) B. Asphyxiation (suffocation) leading to death C. Retardation in crop growth D. Damage to building materials like marble...