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. Echocardiography is a technique that uses: A. Light waves B. Ordinary sound waves C. Ultrasonic waves D. Infrasonic waves Explanation: It is used to create images of the heart by analyzing the reflected ultrasound waves. 2 / 202. 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. 3 / 203. Which of the following is NOT an application of ultrasound? A. Measuring the depth of the ocean B. Detecting earthquakes C. Imaging internal organs D. Cleaning delicate objects Explanation: This is typically done using sonar, which utilizes sound waves within the audible range. 4 / 204. The speed of sound in a medium is highest in: A. Solids B. Liquids C. Gases D. Vacuum Explanation: The closer the particles of the medium, the faster the sound wave can be transmitted. 5 / 205. A sound of single frequency is called: A. Pitch B. Noise C. Note D. Tone Explanation: A musical note is composed of multiple tones. 6 / 206. Breaking kidney stones into fine grains using sound waves is called: A. Ultrasonography B. Lithotripsy C. Sonoluminescence D. Echocardiography Explanation: This technique uses focused ultrasound waves to break the stones. 7 / 207. 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. 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. Which of the following animals can hear ultrasound? A. Bats B. Humans C. Elephants D. Dogs Explanation: Bats use ultrasound for navigation and hunting. 10 / 2010. Ultrasonography is used for: A. Cleaning objects B. Detecting cracks in metal blocks C. Breaking kidney stones D. Examining the foetus during pregnancy Explanation: It helps to detect any abnormalities in the foetus. 11 / 2011. 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. 12 / 2012. 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. 13 / 2013. Which of the following is NOT a characteristic of a sound wave? A. Speed B. Medium 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 SI unit of frequency is: A. Second B. Hertz C. Pascal D. Meter Explanation: Hertz (Hz) is equivalent to cycles per second. 15 / 2015. 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. 16 / 2016. Frequencies higher than 20 kHz are called: A. Ultrasound B. Supersonic sound C. Infrasound D. Audible sound Explanation: Ultrasound has various applications in medicine and industry. 17 / 2017. A hearing aid: A. Produces sound B. Reduces reverberation C. Increases the speed of sound D. Amplifies sound waves Explanation: It helps people with hearing loss to hear sounds more clearly. 18 / 2018. Which of the following statements is NOT true about sound waves? A. They can travel through a vacuum. B. They are produced by vibrating objects. C. They are longitudinal waves. D. They can be reflected. Explanation: Sound waves require a medium to propagate.19 / 2019. The pitch of a sound is determined by its: A. Speed B. Loudness C. Amplitude D. Frequency Explanation: A higher frequency corresponds to a higher pitch. 20 / 2020. Sounds of frequencies below 20 Hz are called: A. Ultrasound B. Supersonic sound C. Audible sound D. Infrasound Explanation: Infrasound is used by some animals for communication. 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
