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All the following provide evidence of fecal pollution, EXCEPT?
Bacteriological indicators of water quality Coliform : E.Coli is most important indicator Fecal Streptococci : Indicator of recent contamination Clostridium perfingens: Indicator of remote contamination
Most desired temperature range of drinking water is?
Most desired temperature range of drinking water is 5 – 10 ˚ C or 40 -50 ˚ F
Most undesirable metal in drinking water is?
Undesirable metals in drinking water: Iron, Manganese, Zinc, Copper, Aluminum, Lead Most undesirable metal in drinking water: Lead
All are “Water-washed diseases” EXCEPT?
Water-washed diseases:- The disease is those that occur as a result of inadequate quantities of water being available for good personal hygiene. Eg:- Scabies, Trachoma, Typhus, conjunctivitis, Shigella, Amoebic dysentery, etc.
Disinfecting action of chlorine on the water is mainly due to?
A slow sand filter is differentiated from the rapid sand filter by all of the following, EXCEPT?
Ortho- toluidine test is used to determine?
True about slow sand filters?
Method of choice for purification of highly polluted water on a large scale is?
The hardness of water is due to all, EXCEPT?
Temporary hardness is due to Calcium & Magnesium salts of Bicarbonates Permanent hardness is due to Calcium and Magnesium salts of Sulfates, Chlorides & Nitrates
A drawback of ozone as water disinfect is?
A psychrometer is used to measure?
Air Humidity is the moisture content in the air Air humidity can be measured by:- Dry and Wet bulb thermometer Hygrometer Sling/Whirling Psychrometer Assman Psychrometer
A Kata thermometer measures?
Kata Thermometer measures ‘cooling power of air’ Cooling Power of Air comprises of Air temperature Humidity Air movement
Greenhouse gases do not include?
Whispering produces a sound of?
Whisper produces : 20 – 30 dB Normal conversation: 60 -70 dB Mechanical damage of Eardrum: 150 – 160 dB
The decibels above which auditory fatigue occurs is?
Recommended illumination range for regular work is -------- foot-candles
Basic minimum illumination for satisfactory vision is 15 to 20-foot candles