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
Correct Answer: Option D
Explanation
18cm …. 100oC
x …. 60oC
3cm …. 0oC
(frac{x – 3}{18 – 3}) = (frac{60 – 0}{100 – 0})
= 12cm