Objective questions

1. Chlorination of water does not reduce:
1. Ammonia content
2. Organic matter
3. B.O.D
4. Dissolved Oxygen Content
2. Dechlorination of water is achieved by adding:
1. Sodium thiosulphate
2. Sodium hexametaphosphate
3. Sodium sulphate 
4. Sodium bisulphite
3. Efficiency of sedimentation tank does not depend upon
1. Detention time
2. Depth of tank
3. Length of tank
4. Horizontal velocity of water
4. Which of the following operations reduces salinity of water
1. Flocculation and sedimentation
2. Filtration
3. Reverse osmosis
4. Electrodialysis
1. 1 and 2
2. 3 and 4
3. 2 and 3
4. 1 and 4
5. The analysis of a water sample is given below:
1. pH = 7.4; TDS = 450 mg/L; Total hardness = 200 mg/L; Chlorides = 100 mg/L;            Sulphates = 200 mg/:L; Fluorides = 0.5 mg/L; Nitrates = 30 mg/L; Calcium = 75 mg/L; Magnesium = 200 mg/L; Iron = 3mg/L. From the data given, what treatments can be applied
1. No treatment except disinfection
2. Treatment for removal of iron, hardness and disinfection
3. Treatment for removal of colour, odour and taste
4. Treatment for removal of iron, taste, odour and disinfection
6. Which of the following statements regarding confined aquifers is true
1. Aquifer is bound above and below by impervious strata
2. The pressure of water is greater than atmospheric pressure
3. If a tube-well is drilled, the water in such an aquifer flows always by itself
4. The aquifer is fully saturated
1. 1,2 and 3 are correct
2. 2,3 and 4 are correct
3. 1,2 and 4 are correct
4. 1,3 and 4 are correct
7. Type II settling in water treatment is defined as:
1. settling of discrete particles in dilute suspensions
2. settling of flocculent particles in dilute suspensions
3. settling of flocculent particles in concentrated suspensions
4. settling of particles in the form of a sludge blanket
8. Water present in an artesian aquifer is 
1. at sub-atmospheric pressure
2. at atmospheric pressure
3. at half the atmospheric pressure
4. more than atmospheric pressure
9. The daily per capita consumption of water apparently increases with
1. higher standard of living of people
2. availability of sewerage
3. metered water supply
4. wholesome and potable public water supply
1. 1,2 and 3
2. 1,3 and 4
3. 1,2 and 4
4. 2,3 and 4
10. If methyl orange alkalinity of water equals or exceeds total hardness, the entire hardness of the water sample is:
1. non-carbonate hardness
2. pseudo hardness
3. carbonate hardness
4. negative non-carbonate hardness
11. The correct sequence of processes in a water treatment plant for rural water supply is:
1. chlorination, aeration, sedimentation, rapid sand filter
2. coagulation, sedimentation, slow sand filter, chlorination
3. coagulation, flocculation, clarification, pressure filter
4. aeration, plain sedimentation, slow sand filter, chlorination
12. Which of the following filters produces water of higher bacteriological quality
1. Slow sand filter
2. Rapid sand filter
3. Dual media filter
4. Pressure filter
13. Which of the following statements is true
1. Ground water is free from suspended and dissolved impurities
2. Suspended matter often contains pathogenic bacteria
3. Rain water is soft and tasteless
4. Lake water may contain microscopic organisms
1. 1,2,3 and 4
2. 1,3 and 4
3. 1 and 2
4. 2,3 and 4
14. The common problems associated with operation of rapid sand filters are:
1. Air binding
2. Cracking of sand beds
3. Bumping of filter beds
4. Mud balls
1. 1 and 2
2. 2 and 3
3. 2, 3 and 4
4. 1,2,3 and 4
15. What is the method to determine hardness of water called
16. What is the method to determine amount of chloride content in water called
17. What is the method to determine dissolved oxygen called
18. 
    

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