Grade-4 Sounds

1. What is sound?

• A) A type of light

• B) A type of heat

• C) A type of energy that travels through matter

• D) A type of solid

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

2. What is a vibrating source?

• A) An object that oscillates back and forth

• B) An object that moves in a circle

• C) An object that moves in a straight line

• D) An object that remains still

3. What is pitch?

• A) The loudness of a sound

• B) The quality of a sound

• C) The speed of a sound wave

• D) The highness or lowness of a sound

Tags

NGSS.MS-PS4-1

5. Why does sound become quieter as it travels away from a source?

• a) The sound waves get smaller

• b) The sound waves get louder

• c) The sound waves get slower

• d) The sound waves get absorbed by the surrounding environment

Tags

NGSS.MS-PS4-2

Sound waves cannot travel through a vacuum.

• True

• False

Sound intensity is measured using:

• Lux meter

• Decibel meter

• Newton meter

A sound with a ___ pitch would be described as high, while a sound with a ___ pitch would be described as low.

• high-low

• low-high

Suppose you were standing 100 meters away from a fireworks display. Would you expect to hear the sound of the explosions at the same volume as someone standing right next to the display? Why or why not?

Answer explanation

Someone standing 100 meters away from a fireworks display would experience a much lower sound intensity than someone standing right next to the display. However, the actual difference in volume will also depend on factors such as the size of the explosions, wind direction, and any obstacles between the person and the display.

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Which of the following can be used to change the volume of a sound?

• a) Changing the size of the sound source

• b) Changing the material of the sound source

• c) Changing the shape of the sound source

• d) Changing the speed of the sound wave

Tags

NGSS.MS-PS4-1

Which of the following instruments can change both the volume and pitch of a sound?

• a) Piano

• b) Guitar

• c) Trumpet

• d) Drum

Answer explanation

The pitch of a piano sound can be changed by pressing different keys, which correspond to different strings that are tuned to different frequencies. When a key is pressed, a mechanism inside the piano causes a hammer to strike the corresponding string, producing a sound with a specific pitch.