M.E.L.T.S. Review

Look at the following diagrams. Which one shows a closed circuit?

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• 
• 
• 

Which statement describes the material that would be better to not transfer heat energy?

• A. metal, because it is a good conductor

• B. plastic, because it is a good conductor

• C. metal, because it is a good insulator

• D. plastic, because it is a good insulator

Jacob is removing a lamp cord from an electrical outlet. Which statement correctly describes why he should only touch the plastic cover?

• It is a conductor, so it easily transfers electrical energy.

• It is an insulator, so it easily transfers electrical energy.

• It is a conductor, so it does not easily transfer electrical energy.

• It is an insulator, so it does not easily transfer electrical energy.

Which material is often used to make electrical wire because it is an excellent conductor of electricity and heat?

• Copper

• Iron

• Aluminum

• Silver

Stella is investigating materials around her house in order to determine if they are insulators or conductors of electricity. Which of the following pairs correctly identifies a conductor and an insulator?

• Copper is a conductor and plastic is an insulator.

• Wood is a conductor and metal is an insulator.

• Glass is a conductor and rubber is an insulator.

• Plastic is a conductor and copper is an insulator.

Which of the following travels the fastest?

• motion

• light

• sound

• space ships

Which material is often used to make electrical wire because it is an excellent conductor of electricity and heat?

• plastic

• silicone

• copper

• lead

8. Joel is watching fireworks. He hears them after he sees them because:

• Light travels faster than sound

• Sound travels faster than light

• Fireworks produce more sound than light

• None of the above

9. Rainbow and primes _______________ light

• reflect

• absorb

• refract

• shine

Sally looks at her straw in a glass of water.

• Absorption

• reflection

• refraction

• magnetism