_____ 3. A sound wave is a mechanical wave, not an electromagnetic wave. This means that

A. A sound wave transports its energy through a vacuum.
B. A medium is required in order for sound waves to transport energy.
C. Particles of the medium move perpendicular to the direction of energy transport.
D. Particles of the medium regularly and repeatedly oscillate about their rest position.

_____ 4. A kind of energy produced by stimulation of the organs of hearing by vibrations transmitted through the

air or other medium.
A. Sound C. Light
B. Heat D. Wave

_____ 5. What happens when waves pass by?

A. The particles vibrate
B. The particles stop moving
C. The particles move forward
D. The particles remain stationary

_____ 6. What is called a wave that is displeasing in the sound senses?

A. Dirt C. Noise
B. Smoke D. Disgust

_____ 7. The Unit Hertz (Hz) is name after _________

A. Heinrich Rudolf Hertz C. Hertz Johannes
B. Heinrich Hertz D. Michael Jay Hertz

_____ 8. If a sound's pitch is high, its source is

A. An echo C. vibrating quickly
B. nearby D. a sonic boom

_____ 9. How do we know that waves carry energy?

A. Waves move back and forth
B. Waves causes disturbances
C. Waves must travel in a medium
D. Waves can set other objects into motion

_____ 10. How do transverse waves move?

A. The particles move up and down to the direction in which the waves travel.
B. The particles move back and forth to the direction in which the waves travel.
C. The particles move in circular paths to the direction in which the waves travel.
D. The particles move back and forth and side to side to the direction in which the waves
travel.

_____ 11. It is the highness or lowness of a sound as determined by its vibration.

A. vibration C. wave
B. sound D. pitch

_____ 12. Sound is a form of ____________.

A. Volume C. Energy
B. Force D. Pitch
_____ 13. It collects the sound waves and focuses on the ear canal.
A. Outer Ear C. Inner Ear
B. Ear Canal D. Middle ear

_____ 14. What happens to the sound an object makes when the speed of vibrations decreases

(slowdown)?
A. its volume will increase C. its volume decreases
B. its pitch becomes lower D. NONE of the above

_____ 15. Frequency is measured in:

A. Hertz C. Frequency
B. B cycles per second D. Amplitude

II. TRUE or FALSE: Write TRUE if the statement is correct and write FALSE if the statement is wrong.
__________ 16. Sound travels faster in solids than in liquids because of its molecular structure.
__________ 17. The higher the amplitude, the softer the sound produces.
__________ 18. Animals Like dogs can detect sounds up to 50 000 Hz.
__________ 19. Sound speed can travel faster in hotter places rather than in cold places.
__________ 20. Frequency in sound is also called Pitch.