The number of significant figures in the measurement x = 10.00300 are:
Correct answer: A. 7
- A. 7
- B. 8
- C. 5
- D. 3
Explanation
The number of significant figures in a measurement includes all the certain digits plus the first uncertain digit. In the measurement x = 10.00300, all the digits are significant because:The digits '1' and '0' before the decimal point are significant.The digits '00300' after the decimal point are significant because they follow a non-zero digit.Thus, there are a total of 7 significant figures. Options B, C, and D are incorrect because they either overestimate or underestimate the count of significant figures.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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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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