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