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 The order of magnitude of a physical quantity must be expressed in proper unit. Comment on this statement.

if u dont answer this in a proper unit then it will differ....lets take an example-  2.5*10^2 m is different from 2.5*10^2 km...so it is necessary

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 because by change of unit, the power of ten in its magnitude will also change

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 Reference Concise Physics , I C S E, Class 9(Part 1), Chapter 1 Estimation and Units, page 2, left hand side, first para.  

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YES

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give the numericals

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what is meant by measurement?

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if we compare  some short of thing with the thing whose size we wanna know then we measuring the thing

are

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because by change of unit the powers of ten in its unit will also change

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