Exposure to which sound level for a short period can damage the eardrum?

In $1984$,the Bhopal gas tragedy was caused due to the leakage of

What is cultural eutrophication?

Noise pollution is created if noise is in excess to:

Which of the following pollutants is released in the largest quantity from the exhaust emissions of petrol/diesel automobiles?

Discuss briefly the following:
$(a)$ Greenhouse gases
$(b)$ Catalytic converter
$(c)$ Ultraviolet $B$