TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?
TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?
A. 5
B. 100
C. 1000
D. 2000
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Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes_________________?
Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes_________________?A. Paralysis of muscles & loss of appetite
B. Nervous depression
C. Gastritis and diarrhea
D. All A., B. and C.Presence of high concentration of ozone and smog in atmospheric air causes the __________________?
Presence of high concentration of ozone and smog in atmospheric air causes the __________________?A. Embrittlement & decrease of folding resistance of paper
B. Cracking of rubber products
C. Fading of dye on textiles
D. Damage of electrical insulator on high tension power lineDisinfection of water is done to remove ______________________?
Disinfection of water is done to remove ______________________?A. Color
B. Bad taste
C. Foul odour
D. BacteriaWhich is the most widely used coagulant for the treatment of turbid water ?
Which is the most widely used coagulant for the treatment of turbid water ?A. Alum (aluminium sulphate)
B. Lime
C. Ferric chloride
D. Sodium aluminateTurbidity of water is an indication of the presence of__________________?
Turbidity of water is an indication of the presence of__________________?A. Suspended inorganic matter
B. Dissolved solids
C. Floating solids
D. Dissolved gasesShouting by a man at his full voice corresponds to a voice level of about _____________ decibels?
Shouting by a man at his full voice corresponds to a voice level of about _____________ decibels?A. 25
B. 50
C. 80
D. 120