Which of the following may account for the difference in measurement between measurements taken by two separate individuals?
I. Error in observation
II. Faulty device
III. Factors of surrounding like temperature and pressure

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I and II

II only

I, II and III

I only

answer is D.

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Detailed Solution

When two separate individuals take the measurement, a difference in measurement may arise due to an error in observation.
For instance, one of the participants may not position the eye exactly in front of the point where the observation is to be made while measuring the length of an object. This could lead to an observational error and a different measurement.
A faulty device can also lead to differences in measurement.
For instance, a person's measurement could be incorrect and different from the other individuals if his ruler is broken.
External variables like pressure and temperature might also be important.
For instance, when the temperature is high, metals tend to expand. Their measurements will differ if two people take the measurement in different temperature conditions.

Therefore, 'I, II and III' is the correct response.

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