Q. A faulty thermometer has its fixed points marked 5 and 95. When this thermometer reads 68, the correct temperature in Celsius is
A) 68$℃$
B) 70$℃$
C) 66$℃$
D) 72$℃$
Explanation
(b) $\frac{C}{100} = \ \frac{x - lower\ fixed\ point}{upper\ fixed\ point - lower\ point} = \frac{68 - 5}{95 - 5} = \frac{63}{90} = \frac{7}{10}$
$C = \frac{700}{10} = 70{^\circ}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.