SI Units

What is the symbol for the prefix kilo-?

• L

• m

• k

• kg

Conversions are methods of expressing a physical measurement or quantity via a different term (e.g. length in feet or inches). Which of the following can be multiplied by a given quantity without changing the physical meaning of the value? Select all that apply.

Answer explanation

All of these are conversion factors. In each case, the numerator and denominator are equal, making the ratios equal to 1. Multiplying any value by 1 DOES NOT change it. Thus, ALL can be multiplied by any quantity without changing it.

Some conversions require multiple steps. Which of the following conversion factors would be used to convert 1.25 years to seconds? Select all that apply.

Answer explanation

Hours can be converted directly to seconds using 1 h/3600 s.

What is the SI unit for mass?

• ounce

• newtons
• pounds
• kilograms

The SI unit for time is the __?__.

• hours (h)

• liter (L)

• gram (g)

• second (s)

What SI unit is used to measure length?

• meters

• liters

• centimeters

• kilograms

What prefix is represented by the following symbol:  k

• hecto
• kilo
• deci
• deka

What prefix is represented by the following symbol: m

• hecto

• kilo

• milli

• mega

9 meters = ___________cm

• 900 cm

• 90 cm

• 0.9 cm

• 0.09 cm

In the metric system to convert from a larger unit to a smaller unit you should

• multiply

• divide

• add

• subtract