Question

A faulty thermometer has its fixed points marked as 5° and 95°. The temperature of a body as measured by the faulty thermometer is 59°. Find the correct temperature of the body on a Celsius scale.

(a) 60°C

(b) 40°C

(c) 20°C

(d) 0°C

This question was addressed to me in an interview for internship.

Origin of the question is Thermal Expansion in section Thermal Properties of Matter of Engineering Physics I

Answer 1

The correct option is (a) 60°C

The explanation is: (TC-0)/(100-0)=(Temperature on faulty scale-Lower fixed point)/(Upper fixed point-Lower fixed point)

(TC-0)/100=(59-5)/(95-5)=54/90

TC=60°C.