Question

1. what is the si unit for mass?

ton (t)
milligram (mg)
gram (g)
kilogram (kg)

1. how is a ratio used in unit conversions?

as a fraction that shows the relationship between two equivalent values.
as a method to eliminate significant figures.
as a way to compare two measurements.
as a way to round numbers.

1. which of the following digits is always significant?

zeros without a decimal point.
zeros before the first nonzero digit.
any nonzero digit.
zeros after a decimal point in a whole number.

Explanation:

Question 10

The SI (International System of Units) unit for mass is defined as the kilogram (kg). While gram (g), milligram (mg), and ton (t) are units of mass, the base SI unit for mass is kilogram.

In unit conversions, a ratio (conversion factor) is used as a fraction that represents the relationship between two equivalent values (e.g., \( \frac{1\ \text{m}}{100\ \text{cm}} \) shows the equivalence between meters and centimeters). It is not for eliminating significant figures, just comparing measurements, or rounding numbers.

Nonzero digits are always significant. Zeros without a decimal point (like in 100, the trailing zeros may not be significant), zeros before the first nonzero digit (leading zeros) are not significant, and zeros after a decimal point in a whole number (like 100. where the trailing zero after decimal in a whole number context - but actually, for significant figures, non - zero digits are always significant. For example, in 123, 1, 2, 3 are all significant.

Answer:

D. Kilogram (kg)

Question 11