The reading of a centigrade thermometer coincides with that of Fahrenheit thermometer for a liquid. The temperature of the liquid (inC∘) is
A
−40∘C
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B
0∘C
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C
100∘C
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D
300∘C
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Solution
The correct option is A−40∘C Relation between centigrade and fahrenheit readings is, C5=F−329...(i)
Since centigrade and fahrenheit thermometer readings are equal, i.e C=F ⇒Putting in Eq (i), C5=C−329 4C=−160 ∴C=−40∘