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Q.

A Centigrade and a Fahrenheit thermometer are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers 140°. What is the fall in temperature as registered by the Centigrade thermometer ?

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a

30o

b

40o

c

60o

d

80o

answer is B.

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Detailed Solution

∆F=212o-140o=72o ∵               ∆C5=∆F9 ∵               ∆C5=729 ⇒                 ∆C=40o
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A Centigrade and a Fahrenheit thermometer are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers 140°. What is the fall in temperature as registered by the Centigrade thermometer ?