Question

A Centrigrade and a Fahrenheit thermometer are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers ${140}^{\circ }C$. What is the fall in temperature as registered by the centrigrade thermometer.

• A. ${40}^{\circ }$
• B. ${80}^{\circ }$
• C. ${50}^{\circ }$
• D. ${90}^{\circ }$

Answer 1

The correct option is A ${40}^{\circ }$

From the formula
$\frac{C}{5}=\frac{F-32}{9}$
$\Rightarrow$ $\frac{C}{5}=\frac{140-32}{9}=\frac{108}{9}$
So, fall of temperature in ${}^{o}C$ is
$100-60={40}^{o}C$