Pick out the one which is not a chemical coagulant ?
A. Aluminium sulphate
B. Ferrous sulphate
C. Hydrated lime
D. Chloramine
Chemical Environmental Engineering
Presence of dissolved impurities of ______________ is responsible for the red brownish color of water?
Presence of dissolved impurities of ______________ is responsible for the red brownish color of water?
A. Carbonates
B. Bi-carbonates
C. Iron & manganese
D. Arsenic
The concentration of water vapour in troposphere, which depends upon the altitude & temperature, varies in the range of zero to ______________ percent?
The concentration of water vapour in troposphere, which depends upon the altitude & temperature, varies in the range of zero to ______________ percent?
A. 1
B. 4
C. 8
D. 12
Turbidity 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 gases
‘Particulate’ air pollutants are finely divided solids and liquids. Which of the following is not a „particulate‟ ?
‘Particulate’ air pollutants are finely divided solids and liquids. Which of the following is not a „particulate‟ ?
A. Dust & mists
B. Smoke & fumes
C. Photochemical smog & soot
D. None of these
During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum ?
During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum ?
A. Idle running
B. Acceleration
C. Cruising
D. Deceleration
Carbon monoxide is a pollutant, which causes_________________?
Carbon monoxide is a pollutant, which causes_________________?
A. Respiratory disease (e.g. asthma)
B. Asphyxiation (suffocation) leading to death
C. Retardation in crop growth
D. Damage to building materials like marble
In water treatment, alum [Al2(SO4)3] is used for the process of __________________?
In water treatment, alum [Al2(SO4)3] is used for the process of __________________?
A. Filtration
B. Coagulation
C. Sedimentation
D. Disinfection
Which of the following is not a secondary air pollutant ?
Which of the following is not a secondary air pollutant ?
A. Ozone
B. Photochemical smog
C. Sulphur dioxide
D. All A., B. & C.
Shouting 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