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In a faulty thermometer freezing point is marked as -20o  and boiling point is 130o . A temperature of human body 34oC  on this thermometer will be read as 

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a
31o
b
51o
c
20o
d
57o

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detailed solution

Correct option is A

For any thermometer reading−freezing pointFundamental  interval=constantR−−20130−−20=34−0100R+20150=341002R+40=102R=31o

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