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