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Units And Measurement

Question

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Can a physical quantity have two or more units? Does the outcome of measurement depend on the system of unit used to make measurement? Is there any relation between the measures of a physical quantity using different units? If yes write the relation.

Solution

Yes. A Physical quantity cannot have more than two units. The outcome of the measurement does not depend on the system of unit used to make the measurement. That is, the magnitude of a physical quantity remains same whatever the system of unit is used.

Let two units u₁ and u₂ be used to measure a physical quantity X. If n₁and n₂ are the numerical factors of measure, then

X = n₁u₁ = n₂u₂

Some More Questions From Units and Measurement Chapter

What is measurement?

What is the need of measurement?

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?

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