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This test consists of 5 short answer questions, 10 short essay questions, and 1 (of 3) essay topics.

Short Answer Questions

1. What is frequency?

2. What do sensors and detectors measure?

3. What makes waves different from molecules?

4. What is it called when levels rise and fall continuously?

5. What happens when electrons are rubbed, shuffled, or brushed off one surface onto another?

Short Essay Questions

1. Discuss sound waves.

2. What are analog quantities and how are its levels described?

3. Define the two types of waves that are discussed.

4. How do liquid crystal displays work?

5. Discuss the three principles which govern the flow of electricity.

6. What are bar codes?

7. Describe some types of memory.

8. What makes it possible to use waves to communicate? How is this done?

9. What are the effects of electrons on the move?

10. How is static electricity formed?

Essay Topics

Write an essay for ONE of the following topics:

Essay Topic 1

One of the greatest impacts upon modern society is the invention of the internal combustion engine. Discuss the following:

1) What is an internal combustion engine?

2) Compare an engine that uses gas to one that is used in a jet.

3) Do you think the overall impact of the internal combustion engine in the modern world has been positive or negative? Explain your answer.

4) What engine preceded the internal combustion engine and what did this engine precipitate? Explain how this engine works.

Essay Topic 2

Discuss the following:

1) Define elements, atoms, and molecules.

2) What are the properties of molecules that are important in the way many tools and machines work? Explain the properties and give an example of each property at work in a tool or machine.

3) How is floating related to the physical properties of molecules? What does density have to do with whether something will float? Does one have to take into account more than one density when calculating if something will float? Why or why not?

4) Why do you think a ball of steel that is three inches in diameter sinks, but a steel ship will float? Explain your answer.

Essay Topic 3

Discuss the following:

1) Explain the basic nature of all springs.

2) What are the three purposes of springs? Give an example of how a spring serves each purpose in a tool or machine. Explain how the spring serves the purpose.

3) When is energy stored in a spring? Give an example of this. What releases that energy?

4) Research the history of springs. When were they invented? By whom? Where? How were the first springs made? How are they made today? What materials have they used to make springs in the past? In the present? Are springs still an important item today? Give several examples of tools and/or machines that use springs. Can you explain how the spring functions in each?

5) Do you think a bungee jumper uses one or more principles of springs? Explain your response.

(see the answer keys)

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