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Units and Measurement
Question
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What is prefix?

Answer

Prefix is multiple or sub-multiple that increases or decreases the size of unit. 
For example, the prefix mega to the SI unit Joule gives us megajoule. It increases the size of the unit. 

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Some More Questions From Units and Measurement Chapter

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?

Is one unit sufficient to measure a physical quantity?