Question

The higher and lower fixed points on a thermometer are separated by $I80mm$ . When the length of the thread above the lower temperature 90mm , the temperature reading would be

• A. ${50}^{o}C$
• B. ${30}^{o}C$
• C. ${10}^{o}C$
• D. $0^{o}C$

Answer 1

The correct option is A ${50}^{o}C$

Given :

$1^{o}C=1mm$

T=90mm

LFP=0

UFP=180mm

Solution:

We have a relation for this type of problem as $\frac{T-LFP}{UFP-LFP}=\frac{K}{100}$

we need K here so by substituting all the values in the formula we get

$\frac{90-0}{180-0}=\frac{K}{100}$

$K={50}^{o}C$

The Correct Opt=A