After STAAR

Two wires carrying electricity can create a spark if they come too close together. This spark can start a fire. Wires carrying electricity are usuallly covered  with plastic to keep them from starting a fire. Why does the plastic keep electricity from starting a fire?

• Plastic is a good insulator.
• Plastic can melt when heated.
• Plastic is softer than wire.
• Plastic conducts electricity.

A student made a list of activities that involve energy.  
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1. Sharks chasing a school of fish
2. A toaster heating bread
3. A cell phone charging
4. A tree limb falling to the ground
5. Tomato plants absorbing sunlight
6. A canoe floating down a river
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Which activities on the list are examples of the use of mechanical energy? 

• Activities 1, 4, and 6 
• Activities 2, 4, and 5
• Activities 1 and 2 
• Activities 3, 5, and 6 

A student puts four objects in a bucket filled with water. The objects are listed below. 
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 Plastic ball
Glass marble
Metal paper clip
Wood block 
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Which two objects are most likely less dense than the water?

• Wood block and metal paper clip
• Plastic ball and glass marble
• Metal paper clip and glass marble
• Wood block and plastic ball

Which of these is not soluble in water?

• Oil
• Salt
• Honey
• Sugar

A student helped his father prepare soup for dinner. His father asked him to use a wooden spoon to stir the soup as it heated.

Why would the student's father ask him to use a wooden spoon?

• The wooden spoon is able to float in the soup

• the wooden spoon is able to sink in the soup

• the wooden spoon is a good conductor of thermal energy

• The wooden spoon is a good insulator of thermal energy

The arrows in the diagrams below represent light. Which diagram best shows how a glass mirror would reflect light?

• 
• 
• 
• 

In the water cycle, the Sun's energy is directly responsible for causing the process at location---

• A

• B

• C

• D

Which of the following best illustrates the direction of energy flow through the food web above?

• Spider to Grasshopper to Grass

• Hognose snake to toad to grasshopper

• Grass to rabbit to hawk

• mouse to spider to toad

If you wanted to test the effect of gravity on an object, which set of materials should you choose?

• battery, wires, lightbulbs
• hot plate, water, thermometer
• two different types of balls, metric ruler
• two cups, two different types of soil, water and seeds

Which of the following is a learned behavior of a kitten?

• Having gray fur
• Playing with yarn
• Drinking Water
• Having two ears