Lab Safety and Measurement Quiz

Which of the following is the correct definition of "accuracy" in scientific measurement?

• The ability to get the same result every time

• How close a measurement is to the true value

• The smallest unit an instrument can measure

• The number of decimal places in a measurement

What is the basic unit of length in the metric system?

• Inch

• Meter

• Foot

• Yard

Which piece of equipment is used to measure the volume of a liquid most accurately in a laboratory?

• Beaker

• Graduated cylinder

• Test tube

• Petri dish

What should you do first if a chemical spills on your skin during a lab?

• Wipe it off with a paper towel

• Rinse immediately with plenty of water

• Tell a friend

• Ignore it

Which of the following best defines "precision" in scientific measurement?

• How close a measurement is to the true value

• The ability to get the same result repeatedly

• The largest value measured

• The number of significant figures

What is the correct way to convert 2.5 kilometers to meters?

• Multiply by 10

• Multiply by 100

• Multiply by 1,000

• Divide by 1,000

Which laboratory equipment is best for heating substances?

• Bunsen burner

• Balance

• Pipette

• Thermometer

What is the first thing you should do before starting any lab experiment?

• Begin mixing chemicals

• Read all instructions carefully

• Put away your safety goggles

• Eat a snack

Convert 150 centimeters to meters.

• 0.015 m

• 1.5 m

• 15 m

• 0.15 m

A student measures the length of a table three times and gets 1.20 m, 1.21 m, and 1.19 m. What does this indicate about the measurements?

• They are accurate but not precise

• They are precise but not necessarily accurate

• They are neither accurate nor precise

• They are both accurate and precise