Class 9 Practice Level 1 – Sound Leave a Comment / By anushka kumari / July 11, 2024 Class 9 Practice Level 1 – Sound Total questions: 40 1. Which of the following is a longitudinal wave? Light waves Sound waves Radio waves X-rays None 2. Sound cannot travel through: Solids Liquids Gases Vacuum None 3. The speed of sound is highest in: Air Water Iron Vacuum None 4. The frequency of a sound wave determines its: Speed Loudness Pitch Amplitude None 5. Which of the following is not a characteristic of a musical sound? Pitch Loudness Quality Brightness None 6. The part of the human ear that converts sound vibrations into electrical signals is the: Eardrum Cochlea Auditory canal Ear ossicles None 7. The phenomenon of echo is due to: Refraction of sound Reflection of sound Absorption of sound Diffraction of sound None 8. Sound travels fastest in: Air Water Steel Rubber None 9. The loudness of a sound is determined by its: Frequency Wavelength Amplitude Velocity None 10. Sound is produced by: Static objects Vibrating objects Transparent objects Non-vibrating objects None 11. In which medium is the speed of sound the lowest? Air Water Iron Vacuum None 12. The device used to reflect sound waves in a particular direction is called: Microphone Loudspeaker Megaphone Stethoscope None 13. The unit of frequency is: Hertz Decibel Meter Joule None 14. Which part of the musical instrument vibrates to produce sound? Strings in a guitar Membrane in a drum Air column in a flute All of the above None 15. The minimum distance required between the source and the reflecting surface to hear an echo is approximately: 10 meters 17 meters 34 meters 50 meters None 16. The audible range of human hearing is: 0-20 Hz 20-20,000 Hz 20-200,000 Hz 200-2,000 Hz None 17. Sounds with frequencies higher than 20,000 Hz are called: Infrasonic Ultrasonic Audible Subsonic None 18. The loudness of a sound is measured in: Hertz Decibels Meters Joules None 19. Ultrasonic waves are used in: Radar Sonar Lasers Radio None 20. The medium through which sound travels the slowest is: Solid Liquid Gas Vacuum None 21. The frequency of a vibrating string can be increased by: Increasing the length Increasing the tension Increasing the mass Decreasing the tension None 22. The term "timbre" refers to the: Loudness of sound Frequency of sound Quality of sound Speed of sound None 23. A tuning fork vibrates to produce sound. What type of vibrations does it produce? Transverse Longitudinal Circular Random None 24. When a body vibrates with its natural frequency due to an external force, it is called: Reflection Refraction Resonance Diffraction None 25. The distance between two consecutive compressions or rarefactions in a sound wave is called: Wavelength Frequency Amplitude Velocity None 26. Which of the following determines the intensity of sound? Amplitude Frequency Wavelength Velocity None 27. Sound travels faster in: Hot air Cold air Vacuum Outer space None 28. Echoes are more distinct when: Reflecting surface is smooth and hard Reflecting surface is rough and soft Reflecting surface is uneven Reflecting surface is irregular None 29. The pitch of a sound is determined by its: Amplitude Frequency Wavelength Velocity None 30. Which part of the drum vibrates to produce sound? The shell The drumhead The drumsticks The base None 31. Human ears are most sensitive to which frequency range? 20-200 Hz 2,000-5,000 Hz 2,000-20,000 Hz 20-20,000 Hz None 32. In which of the following does sound travel fastest? Cold air Warm water Ice Hot air None 33. The unit used to measure sound intensity is: Hertz Decibel Joule Newton None 34. A sound wave consists of: Crests and troughs Compressions and rarefactions Nodes and antinodes Peaks and valleys None 35. Echoes are used in: Radio Sonar Television Mobile phones None 36. Ultrasonic waves are used for: Communication Cleaning delicate objects Listening to music Viewing movies None 37. Sound travels faster in: Solids than in liquids Liquids than in solids Gases than in liquids Gases than in solids None 38. The speed of sound in air at room temperature is approximately: 150 m/s 340 m/s 1,500 m/s 3,000 m/s None 39. The part of the ear that vibrates first in response to sound waves is the: Cochlea Eardrum Ear ossicles Auditory nerve None 40. The quality of sound that distinguishes two sounds of the same pitch and loudness is called: Frequency Amplitude Timbre Velocity None 1 out of 40 Time's up