Which of the following industry is least polluting?
A.Cement industry
B.Oil refinery
C.Thermal power plants
D.Electronic industry
E.Rolling mills
A.Cement industry
B.Oil refinery
C.Thermal power plants
D.Electronic industry
E.Rolling mills
A.0.0005 mg/litre
B.0.005 mg/litre
C.0.05 mg/litre
D.0.5 mg/litre
E.5 mg/litre
A.0 – 50
B.50 – 150
C.200 – 350
D.375 – 500
E.500 – 1000
A.welding
B.Riveting
C.Machining
D.Pressing
A.Have corrosive action on metals
B.Dissolve lead
C.Corrode iron
D.All of the above
E.None of the above
A.7 and 6
B.6 and 5
C.4 and 3
D.3 and 1
E.1 and 0
A.Surveyors
B.Cartrographers
C.Physicists
D.Electronic Engineers
A.1 kg
B.5 to 7 kg
C.10 to 14 kg
D.20 kg
A.Nausea
B.Vomiting
C.Headache
D.All of the above
A.Hard
B.Soft
C.Acidic
D.Pune
E.Free from turbidity