Question

If there are $5$ 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

Answer: (B), (C)

The correct options are
B

When the mercury level coincides with a minor division

C

When the mercury level coincides with a major division

One major division equals $5$ minor division.
$\therefore \text{1 minor division}$ $=\frac{1}{5}\text{major division}$
$\therefore \text{1 minor division}$ $=\frac{1}{5}\left(1^{\circ }\text{C}\right)$
$\text{So,}\text{1 minor division}$ $={0.2}^{\circ }\text{C}$
This is called the least count of thermometer.