The heights of the mercury thread in a mercury-in-glass thermometer when in melting ice and then in steam are 3cm and 18cm respectively. At a temperature of 60oC the height would be
A
7.5cm
B
9cm
C
10.8cm
D
12cm
E
12.6cm
Verified Correct Answer: D.
Physical Principles & Numerical Solution
18cm .... 100oC
x .... 60oC
3cm .... 0oC
\(\frac{x - 3}{18 - 3}\) = \(\frac{60 - 0}{100 - 0}\)
= 12cm
Source: Myschool Past Questions Archive (Record #29184)