Question

A laboratory thermometer shows five small divisions between the markings of 55°C and read 56°C. correctly This means up to
1. 55.1°C
2. 55.5°C
3. 55.2°C
4. 55.25°C

Answer 1

Correct Answer - Option 3 : 55.2°C

Explanation:

Scale division = 5

Total difference in one major scale = 1

Each small scale difference = 1/5 = 0.2

Hence between 55°C to 56°C we have 0.2 rise with each scale means,

55°C, 55.2 °C,55.2 °C, 55.4 °C, 55.6 °C, 55.8 °C and 56°C

The correct means from the options are 55.2°C

Thermometer: ​

• A device that measures the temperature is called a thermometer.
• A thermometer is based on the principle of thermal expansion. 
• Mercury, liquid metal with high density is used. 
• More the heat more will be the expansion.  

Clinical Thermometer	Laboratory Thermometer
It is used to measure body temperature.	It is used in laboratories for experiments. For example, checking the melting or boiling point
The range of temperature is from 35°C to 45°C  usually.	The range varies from - 10°C to 110°C usually.
It uses a Kink near the bulb of the thermometer so that the mercury level does not drop when reading is taken by keeping the thermometer horizontally.	It does not require a kink to hold mercury level as the reading is taken vertically while any boiling or freezing is going on.