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