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Units and Measurement
Question
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Two spheres, one solid and other hollow have same radii and mass. Which sphere has more moment of inertia and why?

Answer

The hollow sphere has more moment of inertia than solid. It is because, in hollow sphere more mass is distributed at a larger distance than solid sphere. The mass is concentrated at the periphery of the hollow disc. 

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Some More Questions From Units and Measurement Chapter

Define physical quantity.

 

Give four examples of physical quantities.

Define unit.

What are the two main required characteristics of a unit?

Can we use same units for different physical quantities?

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?