Releasing of hot water into water bodies is known as :

Mixture of smoke and fog is called :

Among the following which disease is caused by particulate matter ?

Solar energy is an example of which source of energy ?

Black lung disease is caused due to which pollution ?

Which radio active substance will cause Leukemia ?

Which is generated during the burning of coal and petroleum products ?

Which is called the organ of hearing ?

Which causes brown air in traffic congested city ?

Name the coolant gas used in refrigerators ?