The length of a strip is measured by a metre scale as 3.4 cm. The reading measured on the Vernier callipers for the length of the strip will be
Correct answer: D. 3.400 cm.
- A. 0.34 cm.
- B. 3.4 cm.
- C. 3.40 cm.
- D. 3.400 cm.
Explanation
The correct answer is 3.400 cm. Vernier calipers provide more precise measurements than a standard metre scale, typically offering precision to the thousandths of a centimeter. While a metre scale measures to one decimal place (3.4 cm), a Vernier caliper extends this precision, recording the measurement as 3.400 cm to reflect the additional accuracy. The other options either reduce the precision or fail to extend it to the level provided by Vernier calipers.
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About Errors and Significant Figures
Measurement errors include random and systematic effects, absolute, fractional and percentage uncertainty, and the precision shown by significant figures. Questions apply rounding rules and uncertainty propagation in addition, subtraction, multiplication and division, while distinguishing accuracy from precision and uncertainty from an actual mistake.
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