A balance to the true, must satisfy this condition:

Both arms must be of equal lengths.

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Both arms must be made of same material.

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Both arms must be of same colour.

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Both pans must be of same mass.

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Solution

The correct options are
A Both arms must be made of same material.
B Both arms must be of equal lengths.
C Both pans must be of same mass.
The conditions that a true balance must satisfy are that both arms must have equal lengths made up of same material and mass of the both pans must be same. Colour of arms has nothing to do with the measurement of mass.

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