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Units and Measurement
Question
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Define a physical quantity. Give examples of physical and non-physical quantities.

Answer

Physical quantity is quantity in terms of which law of physics can be expressed and which can be measured directly or indirectly. 

Examples of physical quantities are Work, power, force, energy, solar constant, etc. 

Examples of non-physical quantities: love, sympathy. 

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Some More Questions From Units and Measurement Chapter

Can we use different units to measure same physical quantity?

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?