This quiz works best with JavaScript enabled. Home > Cbse > Class 9 > Science > Sound > Class 9 Science Chapter 12 Sound – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 12 Sound Quiz 4 (48 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In the following sentence what word has the long /i/ sound?-I love your sweet smile.- A) Smile. B) Your. C) Love. D) Sweet. Show Answer Correct Answer: A) Smile. 2. The unit of intensity of sound is: A) Meter. B) Watt. C) Hertz. D) Decibel. Show Answer Correct Answer: D) Decibel. 3. Identify a wave which is mechanical? A) Radio wave. B) Light. C) Sound. D) Microwave. Show Answer Correct Answer: C) Sound. 4. Sound of frequency below ..... is called infrasonic sound A) 200 Hz. B) 20 Hz. C) 20, 000 Hz. D) 2000 hZ. Show Answer Correct Answer: B) 20 Hz. 5. How do sound waves travel through a medium? A) Sound waves travel through a medium by pushing particles in the opposite direction of the wave. B) Particles in the medium are displaced from their equilibrium position and then return to it, passing the energy of the wave along. C) Sound waves travel through a medium by changing the color of the medium. D) Sound waves travel through a medium by creating a vacuum in front of them. Show Answer Correct Answer: B) Particles in the medium are displaced from their equilibrium position and then return to it, passing the energy of the wave along. 6. Sound waves with frequencies below 20 Hz are called: A) Mechanical sound. B) Ultrasonic sound. C) Infrasonic sound. D) Audible sound. Show Answer Correct Answer: C) Infrasonic sound. 7. Part of the ear which collects sound from surroundings ..... A) Ear drums. B) Stapes. C) Pinna. D) Cochlea. Show Answer Correct Answer: C) Pinna. 8. I heard the lion ..... A) Neigh. B) Honk. C) Roar. D) None of the above. Show Answer Correct Answer: C) Roar. 9. Which word has the same sound as cake? A) Cat. B) Late. C) Car. D) Camp. Show Answer Correct Answer: B) Late. 10. Explain the phenomenon of reflection of sound. A) Sound reflection occurs when sound waves pass through a surface without any change. B) Reflection of sound is caused by the absorption of sound waves by a surface. C) Sound reflection happens when sound waves disappear upon hitting a surface. D) The reflection of sound occurs when sound waves hit a surface and bounce back. Show Answer Correct Answer: D) The reflection of sound occurs when sound waves hit a surface and bounce back. 11. Identify the initial sound in the word 'apple'. A) /p/. B) /l/. C) /e/. D) /a/. Show Answer Correct Answer: D) /a/. 12. Sound travels in air because: A) Disturbance moves through the medium. B) Particles move from one place to another. C) Air is dense. D) Air is light. Show Answer Correct Answer: A) Disturbance moves through the medium. 13. How many children does Captain Von Trapp have? A) 9. B) 3. C) 5. D) 7. Show Answer Correct Answer: D) 7. 14. The distance between one crest or trough to the next A) Amplitude. B) Sound. C) Lenght. D) Wavelength. Show Answer Correct Answer: D) Wavelength. 15. Explain the working principle of a sonar. A) Sonar works by detecting electromagnetic waves from underwater objects. B) Sonar works by analyzing the temperature of the water to locate underwater objects. C) Sonar works by sending sound waves and receiving their echoes to determine the distance and shape of underwater objects. D) Sonar works by using light waves to determine the distance and shape of underwater objects. Show Answer Correct Answer: C) Sonar works by sending sound waves and receiving their echoes to determine the distance and shape of underwater objects. 16. Echo is produced due to: A) Refraction of sound. B) Absorption of sound. C) Diffraction of sound. D) Reflection of sound. Show Answer Correct Answer: D) Reflection of sound. 17. Give an example of an application of sound in daily life. A) Car horn. B) Alarm clock. C) Whistle. D) Doorbell. Show Answer Correct Answer: D) Doorbell. 18. How does the density of a medium affect the speed of sound? A) Sound travels faster in denser mediums. B) Sound travels slower in denser mediums. C) Sound travels at the same speed in all mediums. D) Density of a medium has no effect on the speed of sound. Show Answer Correct Answer: A) Sound travels faster in denser mediums. 19. In order to hear an echo of a sound wave, the minimum distance between the original sound reflected sound should he A) 10.2m. B) 17.2m. C) 15.2m. D) 13.2m. Show Answer Correct Answer: B) 17.2m. 20. Which of the following is not a characteristic of sound waves? A) Speed. B) Frequency. C) Amplitude. D) Loudness. Show Answer Correct Answer: C) Amplitude. 21. Who played Maria in the version we watched in class? A) Audrey Hepburn. B) Julie Andrews. C) Carrie Underwood. D) Meryl Streep. Show Answer Correct Answer: C) Carrie Underwood. 22. In which of the following phenomena does the sound wave bounce back? A) Diffraction. B) Reflection. C) Absorption. D) Refraction. Show Answer Correct Answer: B) Reflection. 23. Find a word that follows the long /u/ sound in the initial or medial position of a one syllable word. A) Blue. B) Argue. C) Music. D) Dude. Show Answer Correct Answer: D) Dude. 24. What word has the same beginning sound as the word:Frog A) Prog. B) Free. C) Feet. D) Grog. Show Answer Correct Answer: B) Free. 25. Sound travels through a medium as: A) Transverse wave. B) Longitudinal wave. C) Electromagnetic wave. D) Standing wave. Show Answer Correct Answer: B) Longitudinal wave. 26. Find a word that follows the long /u/ sound in a two or more syllable word at the end of the syllable. A) Rescue. B) Cure. C) Duke. D) Computer. Show Answer Correct Answer: D) Computer. 27. What word has the same middle sound as the word Flower? A) Shout. B) Door. C) Pot. D) Shower. Show Answer Correct Answer: D) Shower. 28. Which word has the same vowel sound as knot A) Gnat. B) Knife. C) Boat. D) Call. Show Answer Correct Answer: D) Call. 29. A vehicle that gives warning sound is . A) Ambulance. B) Train. C) Car. D) None of the above. Show Answer Correct Answer: A) Ambulance. 30. What was Captain Von Trapp's occupation? A) Teacher. B) Doctor. C) Naval officer. D) Pilot. Show Answer Correct Answer: C) Naval officer. 31. What is the difference between infrasound and ultrasound? A) The difference between infrasound and ultrasound lies in their frequency ranges. B) Infrasound has longer wavelengths than ultrasound. C) Infrasound travels faster than ultrasound. D) Infrasound is used for communication, while ultrasound is used for medical imaging. Show Answer Correct Answer: A) The difference between infrasound and ultrasound lies in their frequency ranges. 32. How is intensity related to amplitude? A) $I\\propto A$. B) $I\propto\frac{1}{A^2}$. C) $I\\propto\frac{1}{A}$. D) $I\propto A^2$. Show Answer Correct Answer: D) $I\propto A^2$. 33. What is the speed of sound in air at 20$^\circ$C? A) 500 meters per second. B) 400 meters per second. C) 343 meters per second. D) 256 meters per second. Show Answer Correct Answer: C) 343 meters per second. 34. What is the formula to calculate the speed of sound in a medium? A) Speed = frequency + wavelength. B) Speed = frequency x wavelength. C) Speed = amplitude x wavelength. D) Speed = frequency / wavelength. Show Answer Correct Answer: B) Speed = frequency x wavelength. 35. Select the word that begins with the same sound as 'kite'. A) Cat. B) King. C) Dog. D) Night. Show Answer Correct Answer: B) King. 36. Which of these sounds would be created using the foley technique? A) A dog barking. B) Footsteps. C) Dialogue. D) None of the above. Show Answer Correct Answer: B) Footsteps. 37. What do dolphins, bats and porpoise use A) Ultrasound. B) Infrasound. C) Both a and b. D) None of them. Show Answer Correct Answer: A) Ultrasound. 38. Who is 16 going on 17? A) Friedrich von Trapp. B) Kurt von Trapp. C) Maria von Trapp. D) Liesl von Trapp. Show Answer Correct Answer: D) Liesl von Trapp. 39. Rolling of thunder is due to ..... A) Dispersion. B) Reflection. C) Successive reflection. D) Refraction. Show Answer Correct Answer: C) Successive reflection. 40. Sound is produced due to: A) Vibration. B) Reflection. C) Refraction. D) Absorption. Show Answer Correct Answer: A) Vibration. 41. What is the frequency range of human hearing? A) 15 Hz to 18, 000 Hz. B) 30 Hz to 25, 000 Hz. C) 20 Hz to 20, 000 Hz. D) 10 Hz to 15, 000 Hz. Show Answer Correct Answer: C) 20 Hz to 20, 000 Hz. 42. Find a word that follows the /i/ sound at the end of a two or more syllable word. A) Ally. B) Hide. C) Supply. D) Climate. Show Answer Correct Answer: D) Climate. 43. Determine whether the sound is diegetic or non-diegetic-DIALOGUE A) Diegetic. B) Non-Diegetic. C) All the above. D) None of the above. Show Answer Correct Answer: A) Diegetic. 44. What letters make the long "a" sound in steak? A) A-e. B) Ai. C) Ea. D) Ay. Show Answer Correct Answer: C) Ea. 45. Which word has the same vowel/ middle sound as down? A) Snow. B) Found. C) Go. D) Dig. Show Answer Correct Answer: B) Found. 46. In the world of professional film and video production, sound is incorporated during ..... A) Pre-production. B) Production. C) Post-production. D) None of the above. Show Answer Correct Answer: C) Post-production. 47. We can recognise the sound of . A) Piano. B) Whistle. C) Flute. D) All of these. Show Answer Correct Answer: D) All of these. 48. Harmful effects of noise pollution. A) Blood pressure. B) Asthma. C) Both pf them. D) None of the above. Show Answer Correct Answer: C) Both pf them. ← PreviousRelated QuizzesScience QuizzesClass 9 QuizzesClass 9 Science Chapter 12 Sound Quiz 1Class 9 Science Chapter 12 Sound Quiz 2Class 9 Science Chapter 12 Sound Quiz 3 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books