Across
- 5. The process of treating raw water with alum
- 8. When exposed to air, water turning cloudy and reddish brown in colour indicates the presence of this mineral.
- 9. Another name for the biological layer seen on the surface of slow sand filter.
- 10. The carbonate hardness was formerly designated as
- 11. Radiation which has the ability to penetrate tissues and deposit
- 12. Waste water which does not contain human excreta(waste water from kitchens and bathrooms)
- 14. Nephelometric unit is used to express this parameter of water quality.
- 17. ___________thermometer can record air velocities as low as 10 feet per minute.
- 18. Hot fermentation process of composting is also known as _________________method
Down
- 1. Equipment used to calculate the amount of bleaching powder required to disinfect the well.
- 2. Monoxide A colorless, odorless gas produced by incomplete combustion of fossil fuels.
- 3. A harmful physical or chemical agent in the environment.
- 4. The presence of spores of C. perfringens and the absence of the coliform Group in water suggests ___ (recent/remote)faecal contamination
- 6. Equipment which measures the hearing ability.
- 7. An open area all around the house required for proper light and ventilation
- 9. A type of air pollution caused by the presence of excessive amounts of suspended particulate matter in the air.
- 12. Sewage is said to be ______ if the Biological Oxygen Demand is 300 mg/L. and above
- 13. A type of water pollution caused by the discharge of agricultural runoff into water bodies.
- 15. Luminous intensity( Brightness of a point source)
- 16. Type of well which taps water from the water-bearing stratum below the first impervious layer in the ground