Random errors can be reduced byI. taking zero correctionII. taking mean of several measurementsIII. comparing the instrument with another more accurate one
Correct answer: A. II only.
- A. II only.
- B. III only.
- C. I and II.
- D. I and III.
Explanation
The correct answer is Option A:II only.Random errors can be reduced by taking the mean of several measurements, as this averages out the unpredictable variations inherent in each measurement. Option III addresses systematic errors, as comparing with a more accurate instrument helps identify consistent deviations. Option I, zero correction, is also a method to correct systematic errors, not random errors.
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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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