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