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Units and Measurement
Question
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What is the working principle of common balance?

Answer

Common balance is the balance which has each arm suspended.The unknown mass is placed in one arm and the known mass in another until they both become equal. 
Therefore this balance works on the principle of moment of weights. When the weights become balanced, equilibrium is attained. 

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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.