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 1 Sound (ध्वनि) Ch(11)Practice Quiz in Hindi Part – 2 || Class 9 Science Practice Quizzes in English 1 / 201. Which of the following is NOT an application of ultrasound? A. Detecting earthquakes B. Measuring the depth of the ocean C. Imaging internal organs D. Cleaning delicate objects Explanation: This is typically done using sonar, which utilizes sound waves within the audible range. 2 / 202. The ceilings of concert halls are often curved to: A. Reduce reverberation B. Focus sound in a particular direction 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. 3 / 203. Sounds of frequencies below 20 Hz are called: A. Ultrasound B. Supersonic sound C. Infrasound D. Audible sound Explanation: Infrasound is used by some animals for communication. 4 / 204. The pitch of a sound is determined by its: A. Speed B. Amplitude C. Loudness D. Frequency Explanation: A higher frequency corresponds to a higher pitch. 5 / 205. Which of the following animals can hear ultrasound? A. Elephants B. Dogs C. Humans D. Bats Explanation: Bats use ultrasound for navigation and hunting. 6 / 206. Ultrasound is used for: A. Detecting cracks in metal blocks B. Medical imaging C. Cleaning objects 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. 7 / 207. Frequencies higher than 20 kHz are called: A. Ultrasound B. Infrasound C. Audible sound D. Supersonic sound Explanation: Ultrasound has various applications in medicine and industry. 8 / 208. Ultrasonic waves are used to detect cracks in metal blocks because: A. They can bend around corners B. They have a high frequency and can be reflected by small defects C. They travel slower than ordinary sound waves D. They are audible to humans Explanation: Ordinary sound waves would diffract around the cracks, making them difficult to detect. 9 / 209. Which of the following is NOT a characteristic of a sound wave? A. Frequency B. Speed C. Medium 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. 10 / 2010. Which of the following statements is NOT true about sound waves? A. They can travel through a vacuum. B. They can be reflected. C. They are produced by vibrating objects. D. They are longitudinal waves. Explanation: Sound waves require a medium to propagate.11 / 2011. 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. 12 / 2012. The audible range of sound for human beings is: A. 20 Hz to 20000 Hz B. 25 kHz to 50 kHz C. 0 Hz to 10 Hz D. 10 Hz to 10000 Hz Explanation: This is the range of frequencies that most humans can hear. 13 / 2013. The speed of sound in a medium is highest in: A. Vacuum B. Solids C. Liquids D. Gases Explanation: The closer the particles of the medium, the faster the sound wave can be transmitted. 14 / 2014. The quality or timbre of sound helps us to: A. Distinguish between sounds of different amplitudes B. Distinguish between sounds of the same frequency and amplitude but from different sources C. Distinguish between sounds of different frequencies 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. 15 / 2015. The SI unit of frequency is: A. Second B. Pascal C. Meter D. Hertz Explanation: Hertz (Hz) is equivalent to cycles per second. 16 / 2016. Breaking kidney stones into fine grains using sound waves is called: A. Sonoluminescence B. Ultrasonography C. Lithotripsy D. Echocardiography Explanation: This technique uses focused ultrasound waves to break the stones. 17 / 2017. A sound of single frequency is called: A. Pitch B. Noise C. Note D. Tone Explanation: A musical note is composed of multiple tones. 18 / 2018. Echocardiography is a technique that uses: A. Infrasonic waves B. Ultrasonic waves C. Ordinary sound waves D. Light waves Explanation: It is used to create images of the heart by analyzing the reflected ultrasound waves. 19 / 2019. The loudness or softness of a sound is determined by its: A. Amplitude B. Pitch C. Speed D. Frequency Explanation: A larger amplitude corresponds to a louder sound. 20 / 2020. Ultrasonography is used for: A. Cleaning objects B. Detecting cracks in metal blocks C. Examining the foetus during pregnancy D. Breaking kidney stones Explanation: It helps to detect any abnormalities in the foetus. 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 35% 0% Restart quiz Category: Class 9 Science Quizzes in English
