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Units And Measurement

Question

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Comment upon the statement that mass of the earth is very large

Solution

The statement 'mass of the earth is very large' is right when we compare it with the mass of small objects. But, it becomes meaningless when it is compared with the mass of other objects like Sun, bigger planets etc.

For example, the mass of the earth is very large as compared to mass of man, but very small as compared to the mass of the sun or stars.

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?

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