A faulty thermometer reads freezing point and boiling point of water as `-5 ^(@)C` abd `95^(@)C` respectively . What is the correct value of temperature as it reads `60^(@)C` on faulty thermometer?

Options

A. `60^(@)C`
B. `65^(@)C`
C. `64^(@)C`
D. `62^(@)C`

Answer

B

Explanation

`(X-LFP)/(UPF-LFP)` = constant ( for all temperature scales ) where
`LFP rarr` lower fixed point
`UFP rarr` Upper fixed point
`(X-(-5))/(95-(-5)) = (C-0)/(100-0) implies (60+5)/(95+5) = (C)/(100) implies C= 65^(@)C`