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Error and Uncertainty

A faulty ther...

Question

A faulty thermometer has its fixed points marked 5 and 95. When this thermometer reads 68, the correct temperature in Celsius is

A

68°C

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B

70°C

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C

66°C

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D

72°C

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Solution

The correct option is B 70°C
${574.25}^{\circ}$ C

$\frac{C}{100}$ = $\frac{x - l o w e r f i x e d p o i n t}{u p p e r f i x e d p o i n t - l o w e r p o i n t}$ = $\frac{68 - 5}{95 - 5}$ = $\frac{63}{90}$ = $\frac{7}{10}$ = C = $\frac{700}{10}$ = $70^{\circ}$ C

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