1) Temporary hardness of water is caused due to the presence of dissolved a. calcium hydrogen carbonates only b. magnesium hydrogen carbonates only c. Sulphates and chlorides of calcium or magnesium d. calcium hydrogen carbonates and magnesium hydrogen carbonates
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2) Which of the following is an intestinal disease caused by bacteria such as E.coli? a. cholera b. dysentery c. jaundice d. hepatitis
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3) The hardness that can be removed by boiling is called a. temporary hardness b. permanent hardness c. semi temporary hardness d. semi permanent hardness
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4) What is the percentage of groundwater? a. 0 b. 0.002 c. 0.006 d. 0.021
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5) Which type of Hepatitis spreads through polluted water? a. hepatitis A only b. hepatitis B only c. hepatitis C d. hepatitis A and B
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6) Which of the following is the most abundant salt in seawater? a. magnesium chloride b. calcium chloride c. sodium chloride d. sodium nitrate
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7) Which of the following is a disease in which excess of bile from the liver enters the blood and causes yellowness of skin and eyes? a. cholera b. dysentery c. jaundice d. hepatitis
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8) Property due to which water acts as a universal solvent is its a. polarity only b. ability to make hydrogen bond only c. strong dipole dipole interaction d. polarity and ability to make hydrogen bond
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9) What is the first step of raw water treatment? a. sedimentation b. coagulation c. filtration d. chlorination
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10) The fourth step of sewage water treatment is called a. primary sewage treatment b. secondary sewage treatment c. activated sludge treatment d. chlorination
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