Answer :
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A random error is a type of error that occurs unpredictably and can affect the accuracy of measurements. It is not consistent and can vary each time a measurement is taken.
Out of the options provided:
- A. Instrument resolution: This type of error is related to the smallest increment that can be measured by the instrument. It is not a random error.
- B. Failure to zero an instrument: This error occurs when the instrument is not correctly calibrated to read zero. It is a systematic error, not a random error.
- C. Instrument drift: This error happens when an instrument's calibration changes over time, leading to consistent inaccuracies. It is a systematic error, not a random error.
- D. Lag time of the instrument: Lag time refers to the delay between the input and output of the instrument. It is a systematic error, not a random error.
Therefore, the correct answer to the question "Which type of error is a random error?" is none of the options provided. Random errors are caused by various unpredictable factors affecting measurements.
