Sound (ध्वनि) Ch(11) Practice Quiz in Hindi Part – 2 || Class 9 Science Practice Quizzes in English Posted on February 28, 2025February 28, 2025 by Anshul Gupta0% 0 votes, 0 avg 2 Sound (ध्वनि) Ch(11)Practice Quiz in Hindi Part – 2 || Class 9 Science Practice Quizzes in English 1 / 201. Breaking kidney stones into fine grains using sound waves is called: A. Sonoluminescence B. Echocardiography C. Lithotripsy D. Ultrasonography Explanation: This technique uses focused ultrasound waves to break the stones. 2 / 202. Sounds of frequencies below 20 Hz are called: A. Audible sound B. Ultrasound C. Supersonic sound D. Infrasound Explanation: Infrasound is used by some animals for communication. 3 / 203. The loudness or softness of a sound is determined by its: A. Pitch B. Frequency C. Speed D. Amplitude Explanation: A larger amplitude corresponds to a louder sound. 4 / 204. Ultrasound is used for: A. All of the above B. Detecting cracks in metal blocks C. Medical imaging D. Cleaning objects Explanation: Ultrasound has a wide range of applications due to its ability to travel along well-defined paths and penetrate various materials. 5 / 205. The audible range of sound for human beings is: A. 10 Hz to 10000 Hz B. 20 Hz to 20000 Hz C. 25 kHz to 50 kHz D. 0 Hz to 10 Hz Explanation: This is the range of frequencies that most humans can hear. 6 / 206. The speed of sound in a medium is highest in: A. Liquids B. Vacuum C. Solids D. Gases Explanation: The closer the particles of the medium, the faster the sound wave can be transmitted. 7 / 207. Which of the following animals can hear ultrasound? A. Elephants B. Bats C. Humans D. Dogs Explanation: Bats use ultrasound for navigation and hunting. 8 / 208. Frequencies higher than 20 kHz are called: A. Supersonic sound B. Ultrasound C. Infrasound D. Audible sound Explanation: Ultrasound has various applications in medicine and industry. 9 / 209. Which of the following is NOT an application of ultrasound? A. Cleaning delicate objects B. Measuring the depth of the ocean C. Imaging internal organs D. Detecting earthquakes Explanation: This is typically done using sonar, which utilizes sound waves within the audible range. 10 / 2010. Ultrasonography is used for: A. Detecting cracks in metal blocks B. Examining the foetus during pregnancy C. Cleaning objects D. Breaking kidney stones Explanation: It helps to detect any abnormalities in the foetus. 11 / 2011. A sound of single frequency is called: A. Tone B. Note C. Noise D. Pitch Explanation: A musical note is composed of multiple tones. 12 / 2012. Which of the following statements is NOT true about sound waves? A. They are produced by vibrating objects. B. They can travel through a vacuum. C. They can be reflected. D. They are longitudinal waves. Explanation: Sound waves require a medium to propagate.13 / 2013. Which of the following is NOT a characteristic of a sound wave? A. Medium B. Speed C. Frequency D. Amplitude Explanation: While sound needs a medium to travel, the medium itself is not a characteristic of the sound wave. The characteristics of a sound wave are frequency, amplitude, and speed. 14 / 2014. The quality or timbre of sound helps us to: A. Distinguish between sounds of the same frequency and amplitude but from different sources B. Determine the speed of sound C. Distinguish between sounds of different frequencies D. Distinguish between sounds of different amplitudes Explanation: Timbre allows us to differentiate between the sound of a guitar and a piano playing the same note. 15 / 2015. Echocardiography is a technique that uses: A. Light waves B. Infrasonic waves C. Ultrasonic waves D. Ordinary sound waves Explanation: It is used to create images of the heart by analyzing the reflected ultrasound waves. 16 / 2016. A hearing aid: A. Reduces reverberation B. Produces sound C. Amplifies sound waves D. Increases the speed of sound Explanation: It helps people with hearing loss to hear sounds more clearly. 17 / 2017. The SI unit of frequency is: A. Hertz B. Pascal C. Meter D. Second Explanation: Hertz (Hz) is equivalent to cycles per second. 18 / 2018. The ceilings of concert halls are often curved to: A. Reduce reverberation B. Ensure even distribution of sound C. Focus sound in a particular direction D. Increase the speed of sound Explanation: The curved shape helps to reflect sound waves to all corners of the hall. 19 / 2019. Ultrasonic waves are used to detect cracks in metal blocks because: A. They travel slower than ordinary sound waves B. They can bend around corners C. They have a high frequency and can be reflected by small defects D. They are audible to humans Explanation: Ordinary sound waves would diffract around the cracks, making them difficult to detect. 20 / 2020. The pitch of a sound is determined by its: A. Amplitude B. Loudness C. Frequency D. Speed Explanation: A higher frequency corresponds to a higher pitch. Please insert your information to see your ranking अपनी Ranking जानने के लिए कृपया अपनी जानकारी भरे NamePhone Number Your score isThe average score is 40% 0% Restart quiz Category: Class 9 Science Quizzes in English
