Q.4 A) Give scientific reasons for the following: - (Any four) 1) The pulled-out piston of a syringe if released, gets immediately pushed inside again. 2)The outer coat of the penguins of Antarctica are black. 3) Ice is kept in sawdust to keep it from melting for a longer time. 4)The telephone wires which sag in summer become straight in winter. I 5) Food remains safe at 5° Celsius.
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while pulling the piston,pressure inside the syringe decreases as compared to the atmospheric pressure,actually,its tube is empty. hence when there is liquid on the outside of the needle, it gets pulled into the empty space by the vacuum.
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