Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm) ?

Related Mcqs:

Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about _______________ decibels?

A. 105 B. 135 C. 160 D. 185...

Which of the following is a manmade source of air pollution ?

A. Automobile exhaust B. Forest fire C. Bacterial action in soil and swamp areas D. All A., B. and C....

White smoke coming out of the chimney of a furnace indicates the use of_________________?

A. Low excess air B. Very high excess air C. Gaseous fuel in the furnace D. Liquid fuel in the furnace...

Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in____________________?

A. Coagulation and flocculation of colloids B. Oxidation of carbonaceous matter to CO2 C. Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter to the nitrite and eventually to the nitrate D. All A., B. and C....

The pH value of oxidised sewage is about_____________________?

A. 1.8 B. 6.2 C. 7.3 D. 13.4...