Which term is the decimal unit of measurement of the metric system based on meters, kilograms and seconds?

• A. Metric
• B. Decimal unit
• C. SI base units
• D. Base metric

Answer: (A)

The idea being tested is recognizing the name of the measurement system that uses base units like meter for length, kilogram for mass, and second for time, and scales by powers of ten. That system is called the metric system. It’s defined as decimal-based, so units are organized with prefixes such as milli-, centi-, and kilo, making conversions straightforward because everything steps by factors of ten. The term “metric” describes this whole system of measurement, which is why it’s the correct choice.

The other terms aren’t standard names for the system: a description like “decimal unit” isn’t used to name the system, “SI base units” refers to the individual foundational units themselves rather than the entire system, and “base metric” isn’t a recognized term.