Question

A faulty thermometer has ${90.5}^{\circ }C$ and ${0.5}^{\circ }C$ as upper and lower fixed points respectively. What is the correct temperature if this faulty thermometer reads ${15.5}^{\circ }C$

• A. ${16.67}^{\circ }C$
• B. ${16}^{\circ }C$
• C. ${15}^{\circ }C$
• D. ${15.5}^{\circ }C$

Answer 1

Answer: (A)

${16.67}^{\circ }C$

If a thermometer is wrong calibrated then,
If $X$ the temperature reading on the faulty thermometer scale then,
$t=\frac{(X-LFP)}{(UFP-LFP)}\times 100$ where, $t=$actual reading.

So, $UFP={90.5}^{o}C,LFP={0.5}^{o}C$ for a faulty reading of $X={15.5}^{\circ }C$ the actual reading can be found by using above formula is $={16.67}^{\circ }C$