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