The error unlikely to occur in the measurement of physical quantity is:
(A) systematic error
(B) random error
(C) absolute error
(D) relative error
Correct Answer:
✅ (D) relative error
Explanation:
- Systematic error: Occurs due to consistent and predictable factors (e.g., faulty instrument, calibration issue).
- Random error: Arises due to unpredictable fluctuations in readings.
- Absolute error: The difference between measured and true values; always present in measurements.
- Relative error: It is a derived quantity (absolute error / true value), not a type of error that occurs in measurement itself.
Hence, relative error is a calculated value, not an error that “occurs” inherently — making it unlikely to occur during measurement.
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