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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Upper Elementary Science - II
4.7 Sound - Vibrations

A bell rings, a dog barks, an alarm clock rings. Everyday is full of familiar sounds. But what exactly is sound? Here is an example to show how sound makes the air vibrate. Stretch a piece of plastic wrap over the surface of a plastic bowl and fasten it tightly with a rubber band. Sprinkle a few grains of dry sand or rice on the plastic. Now take a big pan, hold it near the bowl, and strike it with a spoon a few times. The grains jump when you hit the pan. This is because the pan is vibrating, which causes the air and then the plastic to vibrate. Vibrating air is called sound waves.

Sound waves move out from a vibrating object in all directions, making the air move back and forth in a way that we cant see. Sounds compress and decompress the air, pushing and them relaxing, making invisible vibrations. Those back and forth vibrations spread out from the source that made them, getting weaker as they get farther away. Thatís why a person standing close is heard more clearly than someone calling from across the street.

Directions: Answer the following questions.
Q 1: How does sound move through a liquid that has particles that are far apart?
not at all

Q 2: The following is not a property of sound:

Q 3: Sound bouncing back from an object causes
a low volume
an echo
a high pitch

Q 4: Pitch is highness and lowness of a sound.

Q 5: What does sound travel through?
vibration waves
electronic waves
sound waves

Q 6: Can sound waves be absorbed?

Q 7: The pitch of a sound is lowest when vibrations are
very fast

Q 8: A flute has
a high pitch
a low pitch
no pitch

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!

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