3. Give reasons.
(a) While purchasing canned food, its expiry date should be checked.
(b) An iron article should be given a coat of paint.
(c) A wooden article should be polished.
(d) Copper and brass utensils should be tinned.
(e) A dry handkerchief gets wet at once on dipping in water, but it takes long for a wet handkerchief to dry. 9
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Explanation:
Answer:a)While purchasing canned food their expiry date should be checked because an expiry date indicates that for how long a canned food is safe for consumption. Canned foods with expired dates are not considered worth consumption as they could affect your health.
Answer:b)Iron articles often undergo rusting resulting in the formation of a reddish-brown layer on its surface. ... An iron article that is coated with paint prevents the interaction of iron with the surrounding air and water and thus protects it from rusting.
Answer:c)A wooden article should be polished because it protects the wooden article from sunlight and all other external conditions and also it reduces the probability of wooden mites damaging the furniture.
Answer:d)Brass is an alloy of copper and zinc. It also undergoes corrosion when exposed to air and moisture. Brass can become oxidized due to atmospheric exposure to form a layer known as patina similar to the corrosion of copper. Hence, to prevent the formation of an oxide layer, brass and copper utensils should be tinned.
Answer:e)A dry handkerchief gets wet at once because it quickly absorbs the water in which it is dipped. However, it takes longer for a wet handkerchief to dry because the water needs to evaporate from the handkerchief.
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