Q. Carbonate hardness can be removed by adding lime to water.

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Q. Which of the following statement is wrong regarding permanent hardness?

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Q. One degree of hardness is equivalent to ___ ppm.

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Q. In which method of determining total hardness of water is based on the premise that hardness producing substance react with soap and form insoluble compounds before lather is produced?

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Q. What is the indicator used in EDTA method?

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Q. The permissible limit of pH preferred for potable water is ___ ppm.

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Q. What is the concentration of H⁺ ions in moles/L in water if the pOH value is 6?

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Q. Which type of bacteria has a rod shaped structure?

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Q. ________ represents the bacterial density that is most likely to be present in water.

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Q. Which of the following is a better test to identify Coliforms?

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Q. What is the temperature at which MPN test is performed?

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Q. Which of the following statement is/are correct regarding coliform bacteria?

i. It is gram negative
ii. It is rod shaped bacteria
iii. It is a harmless aerobic microorganism

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Q. Which of the following is the disease caused by bacterial infections?

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Q. The number of bacterial colonies by Agar plate count test should not exceed ____ per ml for potable water.

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Q. If the acid and gas are formed in the multiple tube fermentation technique, the test is _____

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Q. Which bacteria cause the reddish brown deposits in the tank?

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Q. Which bacteria results in the corrosion of iron and steel pipes embedded in soil?

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Q. Gelatin liquefying bacteria are helpful in the manufacturing of photographic films.

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Q. In 2000, how many dams where there in the world?

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Q. In which countries farming is still the main activity of growing food?

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