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STD: - 3rd (1st Term Exam), Sub: - EVS, Lesson no.10 More about water, Hard words:-, 1) Transparent, 2) Container, 3) Vapor, 4) Gases, 5) Contains, 6) Griddle, 7) Sprinkle, 8) Substances, 9) Quantities, Q.1) Fill in the blanks., (Shape,Transparent,Solid,Pure), 1) Pure water has no colour, smell or taste, 2) Water is transparent., 3) Water does not have a shape of its own., 4) Ice is the soild state of water., Q.2) Write true or false., 1) Water is transparent. True, 2) Pure water looks bluish in color. False, 3) When water is heated a lot it turns in to ice. False, 4) Sugar does not dissolve in water. False, Q.3) We can see a nail that has sunk to the bottom of the water., Ans. Water is transparent there fore we can see a nail that has sunk to the water., Q.4) Sugar disappears when it is added to water and the water is stirred.?, Ans- Sugar can dissolve completely in the water when added and there fore it disappears in water., Q.5) Why does the hot tea in a thermos flask remain hot for a long time?, Ans. The hot tea in a thermos flask remains hot for a long time because it contains a double walled glass bottle. The walls are silvered with vacuum.So heat is not lost by conduction.