Which experimental teachnique reduces the systematic error of the quantity being investigated?
Correct answer: A. Adjusting an ammeter to remove its zero error before measuring a current
- A. Adjusting an ammeter to remove its zero error before measuring a current
- B. Measuring several internodal distances on a standing wave to find the mean internodal distance
- C. Measuring the diameter of a wire repeatedly and calculating the average
- D. Timing a large number of oscillations to find a period
Explanation
Systematic error means that measurements of the same thing will vary in predictable ways. Systematic errors in experimental observations usually come from the instruments which are used in measuring. So, zero error is recognized as the systematic error. Thus adjusting an instrument to remove its zero error before measuring something is the best experimental technique to reduce the systematic error of the quantity being investigated.
This question appeared on the ETEA MDCAT 2014 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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