2nd Nine Weeks Science Review

What type of circuit has a complete path that allows electricity to flow through it?

• Insulator
• Conductor
• Open
• Closed

Why are many wires coated in plastic?

• Plastic keeps its shape.
• Plastic is more dense than copper.
• Plastic is a good insulator.
• Plastic is less expensive than metal.

Energy is defined as the ability to _________ or do work.

• move
• cause change

Which of the following is an example of a transparent item?

• A block of wood
• A piece of wax paper
• A car windshield
• A thin napkin

Which of the following best explains why the Washington Monument can be seen in the water below it?

• A light travels in a compression wave.
• Light is refracted as it enters water.
• Light is reflected off of smooth surfaces.
• Light can pass through water easily.

One way light waves are different than sound waves is that light waves ...

• travel more slowly
• are caused by rapid vibration
• can travel through space

Sound will travel fastest through _______.

• cloth
• steel
• water
• air

The greater the frequency of a sound wave, the ______ the sound.

• lower the pitch
• higher the pitch

Which number on the diagram shows the wavelength?

Energy cannot be ____________ or ____________.

• created, destroyed
• used, lost
• transformed, destroyed
• created, transformed