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