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Units and Measurement
Question
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How would you measure the height of an inaccessible tower?

Answer

The height of an inaccessible tower is triangulation method. 
Triangulation is a way of determining something's location using the locations of other things. 

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Some More Questions From Units and Measurement Chapter

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?