Page 1 : * Can you explain the reason for provi, , , , ing wider basements while constructing dams?, , Water pressure is more at the bottom. So, the chance of collapse of a dam is more at the bottom. To, save the dam from collapsing due to high water pressure, the basement of the dams are made wider., , Let us assess, , , , irections, , , , ‘ind the situation that helps us to understand that gas exerts pressure in all, (a) Drinking water using a straw, , (b) Blowing air into a balloon, , (c) Blowing of wind, , (d) Rising up of steam, , Ans. b, , 2. It was not possible to drink water using a straw with a hole on its side. Why?, a. Water flows out through the hole in the straw., , b. Air pressure inside the straw increases., , ¢. Air moves out through the hole in the straw., , d. Air pressure inside the straw does not decrease., , Ans. d, , 3. Why do sea-divers wear special costume?, , Water pressure is very high in the depth of the sea which may cause health hazards to divers. So they, wear special costumes to escape from the difficulties caused by the high water pressure., , , , , , oosninemg}6s @15}08 a/lavLagnd. aoweRePIo afnviawoeg}o exdleoodd TECH Malappuram caomioou}0, cue #150050 alarms ‘Won@Oain] af SqjsqyoNe8 cme coeaann oases wabqyors oarge., httos://play,google,com/store/apps/details?id=com basith sasthracheppua, , , , , , =, Y10, , ‘TECH Malappuram (Teacher Empowerment through Co-operation and mutual Help), , , , 4, Haven't you seen an injection needle fixed at the top of a drip bottle when a drip is administered, to patients in hospitals? Why?, , While the drip flows out from the bottle, the air pressure in it will decrease. As a result, the air in the, drip tube will pull the medicine in to the bottle. So, in order to make the medicine flow, a separate, way to enter air in to the bottle should be made. Therefore, an injection needle is fixed at the top of, a drip bottle when a drip is administered., , , , les etc. fixed on the roofs of bui, , , , 5. Haven't you noticed sheets,, blows? Why does this happen?, , ings ri, , , , 1g up when a strong wind, , , , When strong wind blows, the atmospheric air over the roof moves fast which reduces the pressure, there. To equalize pressure, the air in the room rises. This results in the rising of tiles and sheets in, the roof.