The number of significant figures in 4.0030 is:
Correct answer: B. Five
- A. Four
- B. Five
- C. Two
- D. Three
Explanation
Five: There are five significant figures in 4.0030. All the digits (4, 0, 0, 3, and 0) are non-zero and the trailing zero after the decimal point indicates precision, making it significant.
This question appeared on the ETEA MDCAT 2009 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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