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