Answer :
Final answer:
The simplest and most common measuring tool is the steel rule, also known as a ruler, which can measure lengths to the nearest millimeter and is widely used for basic measurements in various settings. So, the correct answer is option c.
Explanation:
When identifying the simplest and most common measuring tool, we need to consider the basic tools used in measuring lengths in various settings, such as in a classroom, workshop, or on a construction site. Among the options given, namely a micrometer, Vernier caliper, steel rule, and dial indicator, the steel rule stands out as the most straightforward and widely used instrument. A steel rule, also known simply as a ruler, is the basic measuring tool capable of providing measurements with sufficient precision for a vast array of tasks. Here's why:
- The steel rule allows for quick, direct reading of lengths and distances without the need for any complex mechanisms.
- It is generally available with measuring scales in various units such as inches, centimeters, or millimeters, depending on the system being used.
- A standard ruler can measure length to the nearest millimeter, which is appropriate for many everyday applications.
When compared to other options, such as a micrometer or a Vernier caliper, the ruler is simpler to use and is often the first measuring tool that people become familiar with from a young age. It may not have the extreme precision of a micrometer or the granularity of a Vernier scale, but its simplicity and ease of use make it the most common tool for basic measurements. Thus, the correct answer to the student's question is (c) Steel rule.
