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