Question

If there are 10 minor divisions between two major divisions, one major division representing $1^{\circ }C$, one minor division will be equal to

• A. When the mercury level is in between the divisions
• B. When the mercury level coincides with a minor division
• C. When the mercury level coincides with a major division
• D. Depends on the type of thermometer

Answer 1

The correct option is A

When the mercury level is in between the divisions

One major division equals 10 minor division.
$\therefore \text{1 minor division}=\frac{1}{10}\text{major division}\therefore \text{1 minor division}=\frac{1}{10}\left(1^{\circ }\text{C}\right)\text{So,}\text{1 minor division}={0.1}^{\circ }\text{C}$
This is called the least count of thermometer.