1) Which of the following is not a water borne disease? a) jaundice b) cholera c) polio d) typhoid 2) tiny droplets suspended in air is known as a) mist b) frost c) dew d) fog 3) we cannot drink distilled water because a) it contains minerals b) it contains salt c) it is tasteless d) all of the above 4) Which of the following will not form a uniform mixture? a) water and oil b) water and spirit c) water and oxygen d) none of the above 5) 1. Freezing point of water is 0° C and boiling point of water is: -100° C. 2.Density of water is 1 gm/ cc at 4° C. Which of the following options will be correct? a) 1 correct 2 incorrect b) both incorrect c) both correct d) 1 incorrect 2 correct 6) World Water Day is celebrated on a) 22nd January b) 22nd May c) 22nd March d) 22nd August 7) potash alum is added to water for a) sedimentation b) loading c) filtration d) aeration 8) which of the following is a source of underground water? a) b) c) d) 9) clay, sand particles, organic matter, harmful bacteria etc are present in a) river water b) rain water c) sea water d) well water 10) According to the picture given, which of the following statement is incorrect? a) Ice melts on heating to form water b) heat applied on steam coverts it to water c) water can be changed back to ice by cooling d) vapour formed after getting heated mixes up with air.

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