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