Chapter 2 Practice Test 7th Grade

The amount of matter an object contains is its

• length
• mass
• weight
• volume

The basic SI unit of length is the

• mile
• liter
• meter
• celsius

0 degrees Kelvin is equal to what temperature in Celsius?

• 273
• -273
• 0
• 100

Which of the objects on page 81 has a greater volume? Explain.

• A, because it has the biggest number length
• A, because it has more mass
• B, because it looks the biggest
• B, because 64cm^3 is bigger than 48cm^3

A 12.5 g marble displaces 5.0 mL of water. What is its density?

• 17.5 g/mL
• 2.5 g
• 2.5 g/mL
• 0.4 mL

Significant figures in a measurement

• include only the first digit
• include only estimated digits
• include only the digits that have been measured exactly
• include all of the digits that have been measured exactly, plus one estimated digit

____ refers to how close a measurement is to the true or accepted value.

• precision
• accuracy
• estimation
• significant figures

What is the median of 7, 31, 86, 6, 20, 85, and 12?

• 31
• 20
• 6
• 85

You rush through your lab activity and obtain a percent error of 50%. Why might it be so high?

• When you rush, you may forget a step and mess up the experiment
• When you rush, you may have forgotten to write down the numbers correctly
• When you rush, you may make a mistake in the lab directions
• All of the above

A student got 36/40 on their lab assignment. What was their percent error?

• 0.9%
• 90%
• 0.1%
• 10%