Question

For a faulty laboratory thermometer, the boiling and the freezing points of water are found to be ${97}^o$C and -$3^o$ C, respectively. With this thermometer, a person is trying to measure the temperature of the water as shown below. ​
Find out the actual temperature of the water.​

• A. ${25}^{o}C$
• B. ${20}^{o}C$
• C. ${28}^{o}C$
• D. ${23}^{o}C$

Answer 1

The correct option is C ${28}^{o}C$

Laboratory thermometer readings were defined based on the freezing point and boiling point of water. These points fix two extreme points in the thermometer readings. The freezing point of water is associated with the $0^o$ C and the boiling point of water is associated with the ${100}^o$ C.

Here, both extreme points get disturbed and displaced by -$3^o$C. So the actual $0^o$ C reading now shows as -$3^o$C. and the actual ${100}^o$ C represents${97}^o$ C.

Here, both extreme points get disturbed and displaced by -$3^o$ C. So the actual $0^o$ C reading now shows as -$3^o$C. and the actual ${100}^o$ C represents ${97}^o$C.
The thermomereter is showing a reading of ${25}^{o}C$
With this faulty thermometer, a reading of ${25}^{o}C$ will become
${25}^{o}C$+$3^o$ C =${28}^{o}C$.
Hence the correct temperature is ${28}^{o}C$ for the reading of ${25}^{o}C$.