Q10. Give reasons:
a) Handle of screw driver is not made up of metal.
b) Bells used in temples are made up of metals and not wood
c) Phosphorus is stored under water.
d) Copper is used in electrical wiring.
Answers
Explanation: a) handle of screw driver is not made of metal because to get a good hold (grip) on the screw driver and secondly to protect ourselves from getting an electric shock in case we are dealing with any electrical devices.
b) Metals make a very loud noise if they are collided with each other and wood is too light and weak too make the sound. There are also some rituals due to which bells in temples are made of metals.
c) Phosphorus is stored in water because it is highly reactive and ignites at about 30 degree Celsius. It is also very toxic .
d) Copper is a very cheap metal and also an excellent conductor of electricity. That is why copper is used in electrical wiring.
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Answer:
a) It is not made up metal because the electrician or the person doing the work may get a shock as metal is good conductor of electricity. that's plastic is used intead of metal ad plastic is bad conductor of electricity.
b)metal makes more sound compared to wood as bells are hollow from inside and made up of metal it creates a eco inside and produces more sound but if the bell is made up of wood will not sound as copared to metal bell.
c)phosphorus is insoluble in water . phosphorus react vigorously with oxygen so it is kept in water as in water hydrogen content is greater than oxygen.
d)wire are made up of copper because copper is good conductor of electricity and it allows current or electricity pass through it.
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