Q14. | A shall discrete mass of solid or liquid matter called : |
Q15. | Air pollution from a variety of source and contaminants which cause adverse social, economic and health effects, is classified under : |
Q16. | The category of devices by which dust is separated from a gas is called : |
Q17. | A device in which gas is allowed to mix with water and than impinges on a plate is called : |
Q18. | Aerosols are defined as : |