A. Industrial chimney exhaust
B. Automobiles exhaust
C. Photochemical reaction in polluted atmosphere
D. Burning of domestic fuel
Related Mcqs:
- 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 - Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about ______________ ppm (parts per million)?
A. 0.002
B. 0.2
C. 1.2
D. 4.8 - Threshold limit value (TLV) of CO in air is _____________ ppm?
A. 5
B. 50
C. 2000
D. 5000 - Permissible safe limit (TLV) of _____________ toxic gas is 100-1000 parts per million (ppm)?
A. Highly
B. Moderately
C. Extremely
D. Very extremely - Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ?
A. Acts as a green house gas thereby raising earth’s temperature
B. Causes asphyxia
C. Causes increase in sea level
D. Enhances the green house effect - On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because __________________?
A. Of clotting of blood
B. Of jamming of respiratory tract
C. It forms carboxyhemoglobin by combining with haemoglobin of blood, thereby making it
incapable of absorbing oxygen
D. It forms CO2 by combining with oxygen present in the blood - TLV of ozone (O3) and phosgene (COCl2) in air is _______________ ppm?
A. 0.1
B. 25
C. 100
D. 1000 - TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?
A. 5
B. 100
C. 1000
D. 2000 - 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 - Maximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)?
A. 50
B. 1000
C. 2000
D. 5000
