UPSC CAPF AC 2017 Paper

Question : 107 of 125

Marks: +1, -0

Which one of the following statements about air pollution caused by diesel engines is correct?

It produces large quantity of carbon monoxide at lower and high temperatures.
It produces large quantity of nitrogen oxides at lower and high temperatures.
It produces large quantity of carbon monoxide at lower temperature and nitrogen oxides at high temperature.
It produces large quantity of nitrogen oxides at lower temperature and carbon monoxide at high temperature.

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