Engineering :: Environmental Engineering

41.  Soft waters
A. Have corrosive action on metals B. Dissolve lead
C. Corrode iron D. All of the above
E. None of the above    

42.  The disadvantage of hard water is
A. More soap consumption B. Scale formation in boilers
C. Corrosion of pipes D. Loss of taste in food
E. All of the above    

43.  Identify the incorrect statement if any
A. If the pH value of water is 14 the water has maximum alkalinity B. pH value of 6 represents acidic water
C. Water having pH value 4 will be more acidic than water having pH value of 6 D. Maximum acidity of water is indicated by pH value of zero
E. None of the above    

44.  The pH value of sea water is usually
A. 1 B. Between 3 and 5
C. Between 5 and 7 D. Between 8 and 8.3
E. Between 13.7 and 14    

45.  The pH value of concentrated sulphuric acid could be expected between
A. 7 and 6 B. 6 and 5
C. 4 and 3 D. 3 and 1
E. 1 and 0    

46.  The permissible hardness of water for low pressure boiler is
A. 50 mg/litre B. 150 mg/litre
C. 250 mg/litre D. 350 kg/litre
E. 450 mg/litre    

47.  The permissible hardness of water for public supplies is
A. 10 mg/litre B. 25 mg/litre
C. 75 mg/litre D. 115 mg/litre
E. 400 mg/litre    

48.  Alum increases
A. Hardness of water B. Carbonates of water
C. Sulphates in water D. Acidity of water
E. None of the above    

49.  The process of kolling at the pathogenic bacteria of water-borne diseases to make it safe for hospital use, is known as
A. Zeoliting B. Debacterialisation
C. Sterilization D. Aeration
E. Chlorination    

50.  Prechlorination
A. Improves coagulation B. Reduces odours
C. Reduces organisms D. All of the above
E. None of the above    

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