Question

Which of the following is not an S.I. base unit?

1) meter
2) ampere
3) second
4) gram
5) kelvin

Answer 1

The SI base unit that is not listed in the provided options is the gram. The correct SI base unit for mass is the kilogram.

Step-by-step explanation:

The SI base unit that is not listed in the provided set of SI base units is the gram. The correct SI base unit for mass is the kilogram (kg), not the gram (g). SI base units used in the sciences include the meter (m) for distance, kilogram (kg) for mass, second (s) for time, and ampere (A) for electric current. Therefore, the gram is not an SI base unit as it is not one of the four fundamental units used in the metric system these are part of the metric system, which scales units by powers of 10. Thus, the answer to the student's question is the gram, which is a derived unit of mass in the metric system, rather than a base unit in the SI system.