1. Sound and the Ear

2. 1. Sound wave can travel the fastest in air. air. water. water. iron. iron.

3. 2. Generally, the audible frequency range of human is human is 20 – 200 Hz. 20 – 200 Hz. 20 – 2000 Hz. 20 – 2000 Hz. 20 – 20000 Hz. 20 – 20000 Hz. 20 – 200000 Hz. 20 – 200000 Hz.

4. 3. Ultrasound is defined as sound with frequency more than 20 Hz. 20 Hz. 200 Hz. 200 Hz. 2000 Hz. 2000 Hz. 20000 Hz. 20000 Hz.

5. 4. Which of the followings can 4. Which of the followings can produce ultrasound ? (1) & (2) only (1),(2) & (3) (1), (2), (3) & (4) (1), (2), (3), (4) & (5) (1)Wind (2)Waves (3)Crickets (4)Bats (5)Dolphins

6. 5. Which of the following is NOT an application of ultra sound? 5. Which of the following is NOT an application of ultra sound? To located school of fish To produce image of the fetus inside the mother’s womb. Create image of the lung and check abnormality. Remove dirt attached to jewelry and glasses.

7. 6. Dogs can hear whistle which cannot be heard by human because heard by human because dogs have bigger eats than human. dogs have bigger eats than human. dog can hear the sound of higher dog can hear the sound of higher frequencies than human. frequencies than human. dog can hear the sound of lower dog can hear the sound of lower frequencies than human. frequencies than human. dogs are very sensitive to the sound of dogs are very sensitive to the sound of whistle. whistle.

8. 7. Ear drum is a part of the _____. 7. Ear drum is a part of the _____. outer ear outer ear middle ear middle ear inner ear inner ear

9. 8. The canal which connects the middle ear and the throat is called the _______. 8. The canal which connects the middle ear and the throat is called the _______. Eustachian tube Eustachian tube cochlea tube Semi-circular canal

10. 9. What is the function of the ear bones? Magnify the vibrations and transmit the Magnify the vibrations and transmit the vibrations to the cochlea. vibrations to the cochlea. Collect the sound waves. Collect the sound waves. Secrete sebum to trap dust and inserts. Secrete sebum to trap dust and inserts. Transmit signals to the brain. Transmit signals to the brain.

11. 10. Which part of the inner ear can detect the vibrations? Cochlea Cochlea Ear drum Ear drum Ear bones Ear bones Auditory nerve Auditory nerve

12. 11. Which part of the ear transmit the signals to the brain? Audiory nerve Audiory nerve Cochlea Cochlea Ear bones Ear bones Ear drum Ear drum

13. 12. Which of the following about the path of sound waves entering the ears is CORRECT? eardrum -> ear canal -> ear bones -> eardrum -> ear canal -> ear bones -> auditory nerve -> cochlea auditory nerve -> cochlea ear bones -> cochlea -> eardrum -> ear ear bones -> cochlea -> eardrum -> ear canal -> auditory nerve canal -> auditory nerve ear canal -> eardrum -> ear bones -> ear canal -> eardrum -> ear bones -> cochlea -> auditory nerve cochlea -> auditory nerve cochlea -> ear canal -> ear bones -> cochlea -> ear canal -> ear bones -> eardrum -> auditory nerve eardrum -> auditory nerve

14. 13. Which of the following is NOT a reason that 13. Which of the following is NOT a reason that hinders the effective vibration of the eardrum? hinders the effective vibration of the eardrum? Accumulation of excessive dirt. Piercing of the ear drum The ear bones pressed against one another. Flooding in the external auditory canal.

15. 14. When we hear an excessively loud sound, we should open the mouth. The reason for doing this is to allow air to leave the middle ear and reduce the pressure exerted on the ear drum. breath in air to equalize the pressure on both side of the ear drum. make the three ear-bones to press against one-another. stop the vibration of liquid inside the cochlea.

16. 15. The magnitude of sound is measured in hertz. hertz. decibel. decibel. frequency. frequency. pich. pich.

17. 16. A family gathered after dinner to chat will produce noise about 20 dB 20 dB 40 dB 40 dB 60 dB 60 dB 80 dB 80 dB

18. 17. Long term exposure to noise pollution may causes Damage of the auditory nerves. The ear drum cannot vibrate effectively. Broken of the ear drum. Dying of sensory hair cells in the cochlea

19. 18. Which type of noise is NOT controlled by government ordinance? Noise from domestic premises and public places. Noise from construction site. Noise from intruder alarm system Noise from phones.