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Units and Measurement
Question
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How can we measure the diameter of the moon?

Answer

Angular method is used to measure the diameter of the moon. 

Note: Angular diameter of the moon is the angle subtended by two diametrically opposite ends of the moon at a point on the earth. 

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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.