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