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Laboratory Mathematics: Practice Questions

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Laboratory Mathematics: Practice Questions

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300
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Need Laboratory Mathematics practice? You've come to the right place!

This practice test contains 300 practice questions covering the eleven sections:

  1. Units of Measurement
  2. Significant Digits and Rounding
  3. Exponents and Logarithms
  4. Moles
  5. General Chemistry
  6. Solution Preparation and Dilutions
  7. pH
  8. Temperature
  9. Statistics
  10. Hematology
  11. Clinical Chemistry

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Section 1: Units of Measurement

1) What does the unit mg describe?
  1. Length
  2. Mass
    The unit mg stands for milligram. It is a unit of mass or weight. The prefix milli- means one-thousandth (1/1,000), and a milligram is one-thousandth of a gram.
  3. Time
  4. Volume
2) Which of these units is the smallest?
  1. Meter
  2. Micrometer
  3. Millimeter
  4. Nanometer
    From smallest to largest: nanometer (nm) → micrometer (µm) → millimeter (mm) → centimeter (cm) → meter (m).
    • 1 nanometer = 10⁻⁹ meters
    • 1 micrometer = 10⁻⁶ meters
    • 1 millimeter = 10⁻³ meters
    • 1 centimeter = 10⁻² meters
3) What is the SI unit for volume?
  1. Cubic decimeter
  2. Cubic meter
    In the metric system, the SI unit for volume is the cubic meter.
  3. Liter
    Liter is not an SI unit, even though it is widely used for volume.
  4. Milliliter
4) Which of these units is the largest?
  1. Gram
  2. Kilogram
    From largest to smallest: kilogram → gram → milligram → microgram → nanogram.
  3. Microgram
  4. Milligram
5) What is the basic metric unit for mass?
  1. Gram
    The gram is the basic unit of mass in the metric system.
  2. Liter
    Liter is a measure of volume.
  3. Pascal
    Pascal is a measure of pressure.
  4. Pound
    Pound is an imperial unit, not a metric unit.
6) What is the basic metric unit for measuring length?
  1. Foot
    Foot is an imperial unit, not a metric unit.
  2. Inch
    Inch is an imperial unit, not a metric unit.
  3. Meter
    The meter is the metric unit for length.
  4. Meter cubed
    Meter cubed is for measuring volume, not length.
7) What does the prefix kilo- mean?
  1. 10
  2. 100
  3. 1,000
    The prefix kilo- means a thousand. For example, a thousand grams is a kilogram.
  4. 10,000
8) What does the prefix centi- mean?
  1. 1/10
  2. 1/100
    The prefix centi- means one-hundredth. For example, one-hundredth of a meter is called a centimeter.
  3. 1/1,000
  4. 1/1,000,000
9) What does the prefix nano- mean?
  1. 1 hundredth
  2. 1 thousandth
  3. 1 millionth
  4. 1 billionth
    Nano- means one billionth (10⁻⁹). For example, one billionth of a meter is called a nanometer.
10) What is the abbreviation for moles?
  1. ml
  2. mo
  3. mol
    A mole is 6.02214076 × 10²³ of a substance. The abbreviation for moles is mol.
  4. z
11) What does the symbol μ represent in SI units?
  1. 10⁹
  2. 10⁻³
  3. 10⁻⁶
    The Greek letter μ (mu) represents micro-, a prefix meaning 10⁻⁶ (one-millionth). For example:
    • microgram (μg) = one-millionth of a gram
    • micrometer (μm) = one-millionth of a meter
  4. 10⁻⁹
12) What is the abbreviation for centi-?
  1. c
    The abbreviation for the prefix centi- is "c". For example, "centimeter" can be written as cm.
  2. cent
  3. ci
  4. cm
13) What is the abbreviation for microgram?
  1. Mig
  2. Migs
  3. mcg
    The abbreviation for microgram is mcg or μg.
  4. mg
14) Which prefix means 10⁻⁶?
  1. Centi-
    Centi- means a hundredth (0.01).
  2. Kilo-
    Kilo- means a thousand (1,000).
  3. Micro-
    Micro- means a millionth (0.000001 or 10⁻⁶). Examples are the micrometer (0.000001 meters) and microliter (0.000001 liters).
  4. Nano-
    Nano- means a billionth (0.000000001).
15) What number is a mole?
  1. 10⁴²
  2. 2.71828
  3. 3.14159
  4. 6 × 10²³
    A mole is 6.022 × 10²³ of something, such as atoms or molecules. Therefore, a mole of atoms is 6.022 × 10²³ atoms. This number is known as Avogadro's number.
16) What are cubic decimeters more commonly known as?
  1. Grams
  2. Liters
    A liter is a cubic decimeter (a cube measuring 10 cm on all sides).
  3. Meters cubed
  4. Moles
17) Which prefix means 0.001?
  1. Micro-
  2. Centi-
  3. Pico-
  4. Milli-
    Milli- means one-thousandth (0.001). For example, a millimeter is one-thousandth of a meter.
18) Which is the correct order from largest to smallest?
  1. Millimeter, micrometer, nanometer
    A millimeter (mm) is the largest, a micrometer (µm) is 1/1,000 of a millimeter, and a nanometer (nm) is 1/1,000 of a micrometer. So the order from largest to smallest is millimeter → micrometer → nanometer.
  2. Nanometer, millimeter, micrometer
  3. Micrometer, millimeter, nanometer
  4. Micrometer, nanometer, millimeter
19) Parts per million (ppm) can also be expressed as:
  1. cm³
  2. dm³
  3. mL/billion
  4. mg/L
    ppm stands for parts per million, which is a way of expressing very dilute concentrations of substances. 1 ppm means 1 part of a substance in 1,000,000 parts of the solution. In water solutions, 1 ppm is equivalent to 1 milligram of solute per liter of solution (mg/L), because 1 L of water ≈ 1 kg of water.
20) Which of these is a unit of concentration?
  1. M
    Molarity or M is the number of moles of solute in one liter of solution. It measures the concentration of a solute.
  2. dL
    The deciliter (dL) is a unit of volume.
  3. mmol
    The millimole (mmol) is a unit for measuring the amount of a substance.
  4. μg
    The microgram (μg) is a unit of mass.

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