Class 9 Practice Level 2 – Sound – Set 1 Leave a Comment / By Gulam Hamza / July 11, 2024 Class 9 Practice Level 2 - Sound - Set 1 Total questions: 25 1. How does the speed of sound in air change with temperature? It increases with an increase in temperature. It decreases with an increase in temperature. It remains constant regardless of temperature. It increases then decreases. None 2. Which characteristic of sound changes when we increase the volume of the sound? Frequency Wavelength Amplitude Velocity None 3. The three tiny bones in the middle ear that transmit sound vibrations are collectively known as: Malleus, Incus, and Stapes Cochlea, Eardrum, and Auditory nerve Hammer, Anvil, and Stirrup Both a and c None 4. Which of the following is a practical application of the reflection of sound? Hearing aid Megaphone Stethoscope All of the above None 5. Which of the following is an example of resonance? A singer breaking a glass with their voice An echo in a canyon Sound traveling faster in water than in air The Doppler effect None 6. If the frequency of a sound wave is doubled, what happens to its pitch? It remains the same. It is halved. It is doubled. It becomes inaudible. None 7. Why does sound travel faster in water than in air? Water is denser than air. Water has higher elasticity than air. Both a and b. Neither a nor b. None 8. Ultrasonic waves are commonly used in which medical application? X-rays MRI scans Ultrasound imaging CT scans None 9. The threshold of hearing for humans is approximately 0 decibels 10 decibels 20 decibels 30 decibels None 10. The change in frequency or wavelength of a sound wave due to the relative motion of the source and the observer is called: Resonance Echo Doppler effect Reflection None 11. Which of the following does not affect the speed of sound in a medium? Temperature Pressure Density Frequency None 12. The frequency of a vibrating string is inversely proportional to its: Length Tension Density Thickness None 13. In a sound wave, the region where particles are closest together is called: Compression Rarefaction Wavelength Thickness None 14. Sound travels in air by the process of: Conduction Convection Radiation Wave motion None 15. The speed of sound in a medium is directly proportional to: Density Temperature Wavelength Amplitude None 16. The loudness of a sound is measured in terms of its: Frequency Wavelength Intensity Velocity None 17. Which part of the ear converts sound vibrations into electrical signals? Eardrum Cochlea Ear canal Ossicles None 18. Which of the following is an example of reflection of sound? Echo Refraction Diffraction Absorption None 19. The distance between two consecutive compressions in a sound wave is called: Amplitude Frequency Wavelength Period None 20. If the intensity of a sound wave is increased by a factor of 10, the sound level increases by: 1 decibel 10 decibels 20 decibels 100 decibels None 21. Which of the following is a use of ultrasonic waves? Communication Sonar Radio broadcasting None of the above None 22. The characteristic of sound that enables us to distinguish between different musical instruments playing the same note is: Loudness Pitch Timbre Amplitude None 23. The part of the ear that amplifies sound vibrations is the: Eardrum Cochlea Ear canal Ossicles None 24. The unit used to measure the frequency of a sound wave is: Decibel Hertz Meter Joule None 25. Which of the following materials would sound travel through the fastest? Air Water Wood Steel None 1 out of 25 Time's up