Which metric unit measures weight or mass?

• A. Meter
• B. Gram
• C. Liter
• D. Newton

Answer: (B)

This tests understanding of metric units for mass and weight. In the metric system, mass is measured in grams (and larger units like kilograms), while weight is a force measured in newtons. The gram is the unit used to quantify how much matter an object has, independent of gravity, whereas weight changes with gravity and is expressed in newtons. The meter measures length, and the liter measures volume, so they don’t represent mass or weight. Therefore, the gram is the best answer because it directly measures mass.