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Units and Measurement
Question
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A disc and a ring have same mass and same radius. Which of them has greater value of radius of gyration about their axis?

Answer

The ring has greater value of radius of gyration than disc. The mass of the body with respect to the axis of rotation for a ring is greater. 

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Some More Questions From Units and Measurement Chapter

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?

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

What are fundamental quantities?