Understanding Sound Concepts

What is sound?

• Something that can be seen by the eyes.

• Something that can be heard by the ears.

• Something that can be felt by the skin.

• Something that can be smelled by the nose.

How is sound produced?

• From objects that are stationary.

• From objects that are vibrating.

• From objects that are cold.

• From objects that are soft.

Based on its frequency, how many types of sound are there?

• Two

• Three

• Four

• Five

Which of the following animals can hear infrasonic sound?

• Cats

• Elephants

• Birds

• Fish

What is the frequency range for audiosonic sound?

• Less than 20 vibrations per second.

• Between 20 and 20,000 vibrations per second.

• Above 20,000 vibrations per second.

• Between 10 and 100 vibrations per second.

In which order does sound propagate from fastest to slowest through different mediums?

• Gas, Liquid, Solid

• Liquid, Gas, Solid

• Solid, Liquid, Gas

• Solid, Gas, Liquid

What is an echo?

• A reflected sound heard almost simultaneously with the original sound.

• A sound that cannot be heard.

• A reflected sound heard after the original sound.

• A sound that is absorbed by soft surfaces.

Which of the following materials is used to absorb sound?

• Glass

• Wood

• Cotton

• Metal