In a valid scientific experiment, how many independent variables should be tested?

• 1
• 2
• 3
• as many as possible

How do scientists test a hypothesis?

• F
  formulating questions
• designing models
• conducting an experiment
• drawing conclusions

Which statement is usually the first step in the scientific method?

• testing a hypothesis
• making an observation that makes you question
• forming a hypothesis
• collecting data

Match the form of measurement with the scientific tool pictured.

• length
• time
• mass
• volume

Match the form of measurement with the scientific tool pictured.

• length
• time
• mass
• temperature

Match the form of measurement with the scientific tool pictured.

• length
•  time
• temperature
• mass

Which statement best describes the purpose of the scientific method?

• uses critical thinking to solve scientific problems
• a general description of scientific thinking
• used to find and evaluate possible answers to problems
• all of the above

Which type of graph is best for comparing sets of data?

• line
• bar
• box and whisker
• pie or circle

In science, the "label" or unit for mass is called _____.

• gram (g)
• celsius (C)
• liter (L)
• meter (m)

Ralphie is studying the planets and their movement in the solar system.  If he uses the item in the illustration, which of these phrases best describes what Ralphie is doing?

• collecting data
• taking measurements
• using a model
• conducting experiments