The concentration of which gas is highest in our environment?

Which of the following problems is not created by noise pollution?

 Environmental Protection Act enacted on

The disease "Itai Itai" is caused by;

 Olireculture deals with______?

 Human being can hear range of sound frequency between

Full form of COD is;

World Ocean Day is celebrated at

Layer of atmosphere in which Ozone layer lies is

 In Atmosphere nitrogen consists of;

Under the Motor Vehicles Act, the noise range of horns has been fixed at?