Which of the following is/are required to measure the length accurately?
Both A and B
The length can be accurately measured only if both the number and unit are specified. For example, if we say that the distance between Delhi and Mumbai is 1409 without mentioning the unit, the value of distance will not make sense. To make complete sense out of the given measurement a unit must also be mentioned.
Now, when we mention that the distance between Delhi to Mumbai is 1409km, we specify that the measuring unit is in ‘km’ and that we need 1409 such units to represent the entire length.