NDA 2025
- Exam
- NDA
- Year
- 2025
- Subject
- General Ability
- Chapter
- General Science
NDA 2025 · General Ability · General Science
Which one of the following instruments can be used to measure...
Which one of the following instruments can be used to measure −250°C temperature?
Options
- ABy using a mercury based thermometer
- BBy using an alcohol based thermometer
- CBy using a clinical thermometer
- DBy using thermocouple based thermometer
Correct answer
D. By using thermocouple based thermometer
Step-by-step solution
Mercury freezes at -39^{}^{\circ}\text{C}, so a mercury-based thermometer cannot be used to measure -250^{}^{\circ}\text{C}.
Alcohol freezes at -115^{}^{\circ}\text{C}, so an alcohol-based thermometer is also unsuitable for measuring -250^{}^{\circ}\text{C}.
A clinical thermometer is designed to measure human body temperature, typically in the narrow range of 35^{}^{\circ}\text{C} to 42^{}^{\circ}\text{C}.
A thermocouple-based thermometer can measure a very wide range of temperatures, typically from -270^{}^{\circ}\text{C} to over 2000^{}^{\circ}\text{C} depending on the metals used. Therefore, it can be used to measure -250^{}^{\circ}\text{C}.
Answer: By using thermocouple based thermometer
Alcohol freezes at -115^{}^{\circ}\text{C}, so an alcohol-based thermometer is also unsuitable for measuring -250^{}^{\circ}\text{C}.
A clinical thermometer is designed to measure human body temperature, typically in the narrow range of 35^{}^{\circ}\text{C} to 42^{}^{\circ}\text{C}.
A thermocouple-based thermometer can measure a very wide range of temperatures, typically from -270^{}^{\circ}\text{C} to over 2000^{}^{\circ}\text{C} depending on the metals used. Therefore, it can be used to measure -250^{}^{\circ}\text{C}.
Answer: By using thermocouple based thermometer