All engineering phenomena deal with definite and measured quantities and so depend on the making of the measurement. We must be clear and precise in making these measurements. To make a measurement, magnitude of the physical quantity (unknown) is compared.
The record of a measurement consists of three parts, i.e. the dimension of the quantity, the unit which represents a standard quantity and a number which is the ratio of the measured quantity to the standard quantity.
The mean length of an object is 5 cm. Which of the following measurements is most accurate?
Options:
(a) 4.9cm
(b) 4. 805cm
(c) 5.25cm
(d) 5.4cm