NDA General Ability Question (2025) — Solution

Step-by-step solution

Mercury freezes at -39^ C , so a mercury-based thermometer cannot be used to measure -250^ C . Alcohol freezes at -115^ C , so an alcohol-based thermometer is also unsuitable for measuring -250^ C . A clinical thermometer is designed to measure human body temperature, typically in the narrow range of 35^ C to 42^ C . A thermocouple-based thermometer can measure a very wide range of temperatures, typically from -270^ C to over 2000^ C depending on the metals used. Therefore, it can be used to measure -250^ C . Answer: By using thermocouple based thermometer