Measurement Unit Review

Which of the following is the standard metric unit for measuring mass?

• Meter

• Kilogram

• Liter

• Second

Answer explanation

The standard metric unit for measuring mass is the kilogram. The meter measures length, the liter measures volume, and the second measures time, making kilogram the correct choice for mass.

What is the correct order from biggest to smallest for the metric prefixes and values we learned in class?

• Kilo- 1000

  Hecto - 100

  Deka - 10

  Base - 1

  Deci - 0.1

  Centi - 0.01

  Milli - 0.001

• Milli - 1000

  Centi - 100

  Deci - 10

  Base - 1

  Deka - 0.1

  Hecto - 0.01

  Kilo- 0.001

• Deka- 1000

  Hecto - 100

  Kilo - 10

  Base - 1

  Milli - 0.1

  Centi - 0.01

  Deka - 0.001

• Centi - 1000

  Hecto - 100

  Deci - 10

  Base - 1

  Kilo - 0.1

  Milli - 0.01

  Deka - 0.001

Answer explanation

The correct order from biggest to smallest is Kilo (1000), Hecto (100), Deka (10), Base (1), Deci (0.1), Centi (0.01), and Milli (0.001). This matches the first answer choice.

Which of the following are units of volume in the metric system?

• Gram (g)

• Liter (L)

• Meter (M)

• Cubic Centimeters (cm3)

Answer explanation

In the metric system, volume is measured in liters (L) and cubic centimeters (cm3). Grams (g) measure mass, and meters (M) measure length, not volume.

How many significant figures are in the number 0.00450?

• 2

• 3

• 4

• 5

Answer explanation

The number 0.00450 has three significant figures: the '4', '5', and the trailing '0' after the decimal point. Leading zeros are not counted, but trailing zeros in a decimal indicate precision.

Which term describes how close a measurement is to the true value?

• Precision

• Accuracy

• Density

• Conversion

Answer explanation

The term that describes how close a measurement is to the true value is 'Accuracy'. Precision refers to the consistency of measurements, while density and conversion are unrelated concepts.

What is the formula for density?

• Mass × Volume

• Mass ÷ Volume

• Volume ÷ Mass

• Mass + Volume

Answer explanation

Density is defined as mass divided by volume. Therefore, the correct formula for density is Mass ÷ Volume, which allows you to calculate how much mass is contained in a given volume.

Which of the following is the correct metric conversion: 1 kilometer = ____ meters?

• 10

• 100

• 1,000

• 10,000

Answer explanation

1 kilometer is equal to 1,000 meters. Therefore, the correct metric conversion is 1 kilometer = 1,000 meters.

Which of the following measurements is the most precise?

• 2.3 g

• 2.30 g

• 2.300 g

• 2 g

Answer explanation

The measurement 2.300 g is the most precise because it includes three decimal places, indicating a higher level of detail compared to the others, which have fewer decimal places.

Which instrument is commonly used to measure the volume of a liquid in a laboratory?

• Thermometer

• Graduated cylinder

• Balance

• Ruler

Answer explanation

A graduated cylinder is specifically designed to measure the volume of liquids accurately, making it the correct choice. Other instruments like thermometers, balances, and rulers serve different purposes.

Which of the following numbers has 4 significant figures?

• 0.0045

• 45.00

• 0.0450

• 450

Answer explanation

The number 45.00 has 4 significant figures because the trailing zeros after the decimal point count as significant. The other options either have fewer significant figures or the leading zeros do not count.