Question

A faulty thermometer has its fixed point marked $5C$ and $95C$. This thermometer reads the temperature of a body as ${59}^o$. The correct temperature on Celsius scale is

• A. ${64}^0$
• B. ${54}^0$
• C. ${60}^0$
• D. ${68}^0$

Answer 1

The correct option is C ${60}^0$

For two scales of thermometer,

$\frac{C-0}{100-0}=\frac{Reading}{UPF-LPF}-LPF$

where, $LPF$ and $UPF$ are the lower and upper fixed points on the scale.

Therefore

$\frac{C}{100}=\frac{59-5}{95-5}=\frac{54}{90}=0.6$

$⟹C=0.6\times 100={60}^0$