Grade 8 Science SOUND Extra Questions Revision

 SOUND

Fill in the blanks :

1. Time taken by an object to complete one oscillation is called _______________.

2. Loudness is determined by the _______________________of vibration.

3. The unit of frequency is ________________________.

4. Unwanted sound is called ______________________.

5. Shrillness of a sound is determined by the __________________________.

6. The number of oscillation in one second is called ____________________.

7. The hearing range of human ear is _____________

8. Sound cannot travel in __________________.

9. Sound can travel in _____________________.

10. The pitch of sound depends on __________________.

Choose the correct answer :

1. Ear drum is a part of ____________________ [ sound producing organ or hearing organ]

2. The voice box is also called _________________ [ Larynx / mouth]

3. Large amplitude of sound vibrations will produce __________________________

[ Loud sound / slow sound]

4. Voice of which of following is likely to have minimum frequency _____________________________ [ Baby girl / A woman]

5. The unit of loudness is ________________ ( decibel / Hertz)

Answer the following :

1. Name the sound producing organ in human.

2. How does sound travel from one place to another ?

3. How is sound produced ?

4. What do you mean by musical sound ?

5. How does the amplitude affect the loudness of vibration?

6. What is noise pollution?

7. What is outer part of ear is called ?

8. What are the two main properties of a sound.

9. Which help us to recognize sound?

10. On which factors loudness of sound depend?

11. What is infrasonic vibration? What is their range in Hertz?