The quality of air is monitored by the government to determine whether a city needs to take steps to control air pollution. The air should be tested ____________ to best measure air quality.

• at night when the air is probably less polluted

• once a day during rush hour when the most cars are on the road

• several times a day in all kinds of weather

• once a year on a day with very little traffic

A graduated cylinder contains exactly 35 mL of water. An object was dropped into the cylinder of water, and the water level rose to 50 mL of water. What is the volume of the object?

• 85 mL

• 15 mL

• 35 mL

• 50 ML

When measuring the mass of a baby hamster, what metric unit should be used?

• milliliter

• kilogram

• centimeter

• gram

For scientific data to be considered accurate and reliable, most scientific experiments should be __________.

• conducted 3 times

• conducted only 1 time

• conducted as many times as possible

• repeated no more than 2 times

Which brand of tires appears to make Juan's car go the fastest?

• Brand A

• Brand B

• Brand C

• Brand D

What is the independent variable in the following hypothesis?

HYPOTHESIS: If I get more sleep at night, I will be more attentive in science class.

• attentiveness in science class

• amount of sleep

• seat location in class

• what the teacher is teaching that day

The dependent variable in this experiment is _________

• age

• height

• "Russel's height at 3-year interval"

• there is no dependent variable

According to this graph_______

• more people like hamburgers than fish & chips

• the number of people who like hamburgers increased over time, while the number of people who like fish & chips decreased

• the number of people who like pizza decreased over time, while the number who like fish & chips and hamburger increased

• both the number of people who like hamburgers and pizza increased over time

Which factor does the scientist change?

• dependent variable

• control

• independent variable

• hypothesis

Which factor's response is based on the independent variable?

• control

• constant

• hypothesis

• dependent variable