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Which type of measuring tool is used to determine small distances and thicknesses?

  1. Ruler

  2. Tape measure

  3. Caliper

  4. Protractor

The correct answer is: Caliper

The choice of a caliper as the correct answer is based on its specific design and function, which makes it particularly well-suited for measuring small distances and thicknesses with high precision. Calipers can measure internal, external, and depth dimensions accurately, often down to fractions of a millimeter or inch, depending on the type of caliper used (such as digital, dial, or vernier calipers). In contrast, while a ruler can measure shorter distances, it is generally less precise for smaller measurements than a caliper. A tape measure is designed for longer distances and is not ideal for fine measurements due to the flexibility of the tape. Lastly, a protractor is specifically intended for measuring angles rather than linear distances or thicknesses, making it unsuitable for the question at hand. Thus, the caliper is the preferred tool for achieving accurate small measurements.