CK-12 1.7 SI Units

Open Ended

Why is it important to use standard units like SI units in scientific measurements?

Multiple Choice

Which of the following statements about SI units is correct?

• SI units are based on powers of 10, making them easy to use.

• SI units are only used in the United States.

• There are 10 basic SI units.

Multiple Choice

Which SI prefix represents one-thousandth (0.001) of a meter?

• centi

• milli

• micro

• nano

Multiple Select

Which of the following are correct SI prefixes and their values?

• kilo (k) = 1000

• centi (c) = 0.01

• milli (m) = 0.1

• nano (n) = 0.000000001

Open Ended

Why is it important to use standard units like the SI system in science?

Multiple Choice

If Rob needs 1 meter (39.37 in) of wire and wire is sold by the yard (36 in), does Rob have enough if he buys 1 yard?

• No, 1 yard is less than 1 meter.

• Yes, 1 yard is more than 1 meter.

• Yes, 1 yard is exactly 1 meter.

• It depends on the thickness of the wire.

Multiple Choice

Which of the following statements about the SI system is NOT correct?

• SI is the International System of Units.

• SI has 7 base units with prefixes for multiples and fractions.

• SI is only used in English-speaking countries.

• Conversions between SI and English units are possible.

Open Ended

Why is a common system of units important?

Multiple Choice

What was the main reason for the failure of the Mars Climate Orbiter mission in 1999?

• A software bug unrelated to units

• A hardware malfunction

• A unit conversion error between SI and English units

• A communication failure with NASA