Sound — Advanced

Grade 9 Science — Sound — Advanced: 25 practice questions with instant scoring and explanations.

1. Reflection of sound occurs when:
2. An echo is heard when:
3. The minimum distance at which an echo is heard clearly is approximately:
4. Reverberation is caused by:
5. In an auditorium with proper acoustic design:
6. The law of reflection of sound states that:
7. Ultrasound is used in medical imaging because:
8. SONAR stands for:
9. SONAR is primarily used for:
10. In SONAR, the principle used is:
11. The human ear structure includes:
12. The function of the eardrum is to:
13. The three small bones in the middle ear are collectively called:
14. The cochlea in the inner ear is responsible for:
15. Sound is converted to electrical signals in the ear by:
16. Ultrasound has a frequency:
17. The pitch of sound is determined by:
18. When sound reflects from a curved surface that diverges the sound, it acts like:
19. Acoustic materials are used in studios to:
20. The auditory nerve transmits signals from the ear to:
21. Noise-cancelling headphones work on the principle of:
22. Ultrasound in physiotherapy is used to:
23. The speed of sound in water is approximately:
24. When sound travels from water to air, its speed:
25. The larynx in humans is responsible for: