2004 · Q36
36. Which of the following is detected and estimated by the 'Pollution Check' carried out on motor cars at service stations?
General ScienceEnvironment
- ALead and carbon particles
- BOxides of nitrogen and sulphur
- CCarbon monoxide
- DCarbon dioxide
Explanation
A "Pollution Under Control" (PUC) check on motor vehicles measures carbon monoxide (along with hydrocarbons) in the exhaust against prescribed limits. Lead, oxides of nitrogen and sulphur, and carbon dioxide are pollutants but are not the parameters tested in the standard PUC certification of cars.