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Biology; Chemistry; Physics: Post your doubts here!

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No no no you can't say that :eek:
The metal casing is only made live when it does not have an Earth wire. Accordingly, when the live wire touches the metal case, large amounts of current flow. The fuse blows disconnecting the ciruict, and the charges go away through the Earth Wire. Thus it is made safe to touch
"only made live when it does not have an Earth wire" != "charges go away through the Earth Wire"
We are assuming there is no earth wire thus there is a shock. Also the question does not state that there is an earth wire.
 
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MA00492.jpg
how is it used? and for what is it used?
 
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"only made live when it does not have an Earth wire" != "charges go away through the Earth Wire"
We are assuming there is no earth wire thus there is a shock. Also the question does not state that there is an earth wire.
But there will be a fuse, and if the case were to be live, there would be no current flowing, and thus this kettle will not work
 
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But there will be a fuse, and if the case were to be live, there would be no current flowing, and thus this kettle will not work
if the case were to be live, there would be current flowing through the metal container.
But there will be a fuse --> Not always
 
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if the case were to be live, there would be current flowing through the metal container.
But there will be a fuse --> Not always
Do you know what is meant by
'the case is live'. It means that if you touch it, you will get an electric shock
Also how can an electric kettle not have a fuse? :confused:
 
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http://papers.xtremepapers.com/CIE/Cambridge International O Level/Biology (5090)/5090_s13_qp_12.pdf
Q7, Q17, Q31.

may Allah grant them who answer these to me, good and honest spouses :p Allah k naam pay... someone explain it to me

7.The leaf will be able to photosynthesise despite it being cutoff.So in daylight it will use up CO2 and conc will be lower than normal.At night cells inside will respire and there will be no photosynthesis so there is net loss of CO2 and conc increases.So color changes from purple to yellow

17.Viruses are not cellular and they mostly have RNA instead of DNA so i guess it would be B.

31.This sort of question is mostly a tukka but it could make sense that it lays in water that is very vulnerable to outside forces like man,wind or other weather conditions which could lead to eggs not being able to grow.So it would be B.
 
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