A. Multiple Choice (1 point each) 1. It refers to the sound energy delivered to a unit area of a surface per unit time. a. pitch b. timbre c. intensity 2. The region of higher pressure & density in a vibration is a. compression b. rarefaction c. pressure area 3. Sound that is produced by an irregular vibrations is called a. Musical tone b. harmonics c. noise 4. A wave with frequencies below 20 Hz is called a. infrasonic b. ultrasonic c. audible 5. The capacity of solids to return to its original size or shape. a. density b. velocity c. elasticity B. Fill in the blanks. (1 point each) 6. Bats can hear as high frequency as 7. It refers to the highness or lowness of a sound. 8. Outer ear is also called It receives sound waves and travel through the auditory canal. 9. Sound waves that can be detected by human ear. 10. Inner ear contains a coiled, fluid-filled tube called the C. True or false. (1 point each) 11. Sound is a longitudinal and mechanical waves. 12. High pitch sound is a high frequency sound consisting of short waves. 13. The loudest tolerable but painful sound is called threshold of hearing. 14. Audible sound waves have frequencies above 20,000 Hz. 15. Sounds are more easily and efficiently transmitted in solids than in liquids and gases. D. Enumeration. (1 point each) What are the smallest bones in our body considered as the bridge of ossicles? 16. a 17. 18 What are the parts of ear that are not directly involved in the hearing process? 19. 20.​