6. The measurement of conductivity may lead to the estimation of a) Total solids. b) Total dissolved solids. c) Suspended solids. d) Colloidal solids. 7. Turbidity is caused due to a) The suspended particles. b) The settleable particles. c) The dissolved particles. d) All of the above. 8. The unit of turbidity is. a) TU. b) MTU. c) NTU. d) IU. 9. Alkalinity of water is an indication of: a) Base neutralizing capacity. b) Acid neutralizing capacity. c) Quantity of base present. d) Quantity of base present. 10. Determining the calibration curve for certain element such as spectrophotometer. You need to plot: a) Absorbance against concentration of solution. b) Absorbance of solutions against time. c) Time against concentration of solution. d) Concentration of solutions against time. Sunday Student Name: -[Ahmed Alkhars. Final Exam 1 Std. #:-[210020020 Q1 (10 Pts.) "Laboratory”: Choose the most correct answer. 1 a b C d 6 a b C d 2 a b C d 7 a b C d 3 a b C d 8 a b C d 4 a b C d 9 a b C d 5 a b C d 10 a b C с 1. Acidity of water means a) pH of water in acidic range. b) pH of water in alkaline range. c) Base neutralizing capacity of water. d) Acid neutralizing capacity of water. 2. The hardness of water is mainly due to the presence of a) Carbonate, bicarbonate, chlorides and sulfates of calcium and magnesium. b) Carbonate, bicarbonates of calcium and magnesium. c) Chlorides and sulfates of calcium and magnesium. d) Nitrate and sulfates of calcium and magnesium. 3. The minimum Dissolved Oxygen required for aquatic life in general is a) 9.2 ppm. b) 4 ppm. c) 8.4 ppm. d) 12 ppm. 4. Conductivity is: a) Ability of an aqueous solution to carry current. b) Ability of an aqueous solution to dissolve a solid. c) Ability of a solution to conduct heat. d) Ability of a solution to conduct sound. 5. The conductivity of potable water varies from a) 50 to 1500 micro mhos/cm. b) 150 to 2500 micro mhos/cm. c) 500 to 5000 micro mhos/cm. d) More than 15000 micro mhos/cm.