1. 1. Which of the following is not a true statement?
A) Science is a system of knowledge and the methods used to find that knowledge.
B) Technology is the use of knowledge to solve practical problems.
C) The three branches of natural science are physical, life, and earth and space science.
D) Forces are the building blocks of all matter.

2. Correct !!
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3. A) Forces cause changes in motion.
2. Which of the following is not one of the main ideas of physical science?
A) Forces cause changes in motion.
B) SI units of measurement are used worldwide.
C) All matter consists of atoms.
D) Energy can be transferred from one form to another, but it can never be destroyed.

4. Correct !!
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5. 3. In which step of the scientific method is information obtained through the senses?
A) revising a hypothesis
B) making observations
C) analyzing data
D) drawing conclusions

6. Correct !!
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7. 4. An experiment in which only one variable is changed at a time is a
A) constant experiment.
B) responding experiment.
C) controlled experiment.
D) manipulated experiment.

8. Correct !!
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9. 5. Which of the statements is true about scientific theories?
A) Theories never change.
B) Theories become hypotheses.
C) Theories are never proven.
D) Theories become scientific laws.

10. Correct !!
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11. 6. Why do scientists use models?
A) Models make it harder to understand things.
B) Models do not change.
C) Models prove scientific theories.
D) Models help them to visualize objects that are too big, too small, too expensive, or too dangerous to study directly.

12. Correct !!
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13. 7. How is 0.545 written in scientific notation?
A) 545 x 10-3
B) 5.45 x 101
C) 5.45 x 10-1
D) 545 x 103

14. Correct !!
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15. 8. What are 5 meters equal to?
A) 500 millimeters
B) 500 centimeters
C) 500 kilometers
D) 500 decimeters

16. Correct !!
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17. 9. A statement that summarizes a pattern found in nature is a
A) scientific method.
B) theory.
C) hypothesis.
D) scientific law.

18. Correct !!
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19. 10.On the Celsius scale, at what temperature does water boil?

20. Correct !!
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21. 11. Which of the following is the equation used to convert Kelvin to Celsius?
A) K = °C + 163
B) K = °C + 32
C) K = °C + 273
D) K = °C + 100

22. Correct !!
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23. 12. The graph of data with a direct proportion would be
A) a curved line.
B) a straight line.
C) a jagged line.
D) a circle.

24. Correct !!
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25. A) The unit for the slope of the line is cm/s.
Distance (cm)
Speed of a Ball
13. According to the line graph, which of the following statements is false.
Time (s)
A) The unit for the slope
of the line is cm/s.
B) The slope of the line represents speed.
C) The graph shows a direct proportion between distance and time.
(D) At 0.1 second, the distance is approximately 10 cm.

26. Correct !!
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