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Units and Measurement
Question
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Is it necessary for centre of mass to lie within the body?

Answer

No, centre of mass needs not to lie within the body. It is not necessary that the total mass of the system be actually present at the centre.
The position of the centre of mass is calculated using the usual Newtonian type of equations of motion. 

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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.