Length will be completely specified only if the followed by the is specified.

unit

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metre

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magnitude

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kilometre

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Solution

The correct options are
A unit
C magnitude
Length will be completely specified only if both the magnitude and unit of measurement are specified. To specify length it is not necessary to use the SI unit always. For example, when we say that the distance between Delhi to Mumbai is $1409 k m$ , we specify that the measuring unit is in $k m$ and that we need $1409$ such units to represent the entire length.

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A quantity which can be specified completely by its magnitude is called a vector quantity.

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