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A scale of 1:25 is to be constructed to show centimeters and it should be long enough to measure 10 meters. What is the length of the scale?

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A scale of 1:25 is to be constructed to show centimeters and it should be long enough to measure 10 meters. What is the length of the scale?

(a) 4 cm

(b) 0.4 cm

(c) 40 cm

(d) 400cm

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The query is from Plane Scales topic in portion Scales of Engineering Drawing

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The correct answer is (c) 40 cm

Easy explanation: The length of the scale is calculated as the product of the representative fraction and the maximum length to be measured. Hence, length of the scale = 1 ÷ 25 x 10 x 100 = 40 cm. While calculating it is very important to note the units of the dimensions.

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