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Physics Chapter 1 (Topic 13 : Precision And Accuracy)
Differentiate between precision and accuracy.
(Summative Understanding)
Question(s) will be asked in final examination.
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Accuracy in measurements refers to:
Reasoning: Accuracy means closeness of a measured value to the true or accepted value.
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Precision in measurement refers to:
Reasoning: Precision means consistency among repeated measurements.
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Which statement is correct?
Reasoning: Accuracy compares with true value.
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A measurement is accurate if it is:
Reasoning: Accuracy depends on closeness to actual / true value.
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Which combination is ideal in experiments?
Reasoning: Best measurements are both accurate and precise.
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If measurements are scattered but close to true value, they are:
Reasoning: Closeness to true value shows accuracy, but scatter shows low precision.
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Precision mainly depends on:
Reasoning: Better instruments give more consistent readings.
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Accuracy mainly depends on:
Reasoning: Proper calibration ensures closeness to true value.
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Reasoning: Accuracy ensures closeness to true value.
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A faulty instrument usually affects:
Reasoning: Faulty calibration shifts results away from true value.
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Repeated identical readings indicate:
Reasoning: Consistent readings show precision.
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If readings are close together but far from true value, this indicates:
Reasoning: Consistency without correctness is precision only.
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Which of the following improves accuracy?
Reasoning: Calibration aligns measurement with true value.
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Which improves precision?
Reasoning: Better resolution increases consistency.
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A dartboard analogy: darts close to each other but away from center means:
Reasoning: Clustered but away from target = precision only
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Darts scattered around center mean:
Reasoning: Average position is correct but spread is high.
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Which error mainly affects precision?
Reasoning: Random fluctuations reduce consistency.
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Which error mainly affects accuracy?
Reasoning: Systematic error shifts results away from true value.
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High precision does NOT guarantee:
Reasoning: Precision does not ensure correctness.
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High accuracy means measurements are:
Reasoning: Accuracy depends on closeness to true value.
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Which instrument improves both accuracy and precision?
Reasoning: Calibration + resolution improve both.
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Precision is related to:
Reasoning: Precision means repeatability of results.
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Accuracy is related to:
Reasoning: Accuracy compares measurement with true value.
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Which situation shows both high accuracy and precision?
Reasoning: Close grouping and correct value = both high.
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If instrument has zero error, it affects:
Reasoning: Zero error shifts all readings away from true value.
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Which improves accuracy most in experiments?
Reasoning: Calibration removes systematic deviation.
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Which improves precision most?
Reasoning: Fine scale reduces variation in readings.
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A student gets same reading every time but wrong value. This shows:
Reasoning: Consistency without correctness = precision.
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