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Units and Measurement
Question
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If one says that the area of disc of radius r and diameter d is πr2d, how would you refute?

Answer

The dimensional formula of area is [M°L2T°]
Dimensional formula of πr2d is [M°L3T°]
Hence the statement is False. 

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Some More Questions From Units and Measurement Chapter

To measure a physical quantity X, the unit U is repeatedly used for n times. What is the magnitude of physical quantity?

Does the numerical factor in the quantitative measurement depend on the system of unit used?

Is one unit sufficient to measure a physical quantity?

Can a physical quantity have two or more units? Give example.

What are fundamental quantities?

How many fundamental quantities are there in mechanics?

How many fundamental quantities are there in Physics?

Name the fundamental quantities of mechanics.