Question

5
Q.1 Choose the correct answer of the following.
(i) Which of the following is a dimensionless quantity, even when the measured quantity is
not dimensionless ?
(a) Absolute error
(b) Gross error
(c) Relative error
(d) Experimental error
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Answer 1

The correct option is c) relative error

Explanation:

• In physics, a relative error can be described as an absolute error divided by the mean value.
• Relative error is directly proportional to the absolute error and inversely proportional to the mean value.
• As no direction is required in it, hence relative error is a dimensionless quantity even when the measure quantity is not dimensionless.
• So, option c is the correct option.