How do automobiles fitted with catalytic converters reduce air pollution? Suggest the best fuel for such vehicles.</h…

What amount of noise may damage eardrums thus permanently impairing hearing ability?

What is an undesired high level of sound called?

Which one of the following is mainly responsible for depletion of ozone layer?<br> </h2></div>

Why is CNG (Compressed Natural Gas) preferred over petrol?

Snow blindness is caused by ____________.</h2></div>

Which of the following defines the effect of deforestation on the next generation?</h2></div>

What is the reason for the increase in the BOD?