Answer: Our ears are the organs of hearing in our body. Sound is a form of energy that produces sensation of hearing. Choose the correct answer. Sound cannot be produced without any vibration. How the ɑ: sound is Spelled. These revision notes are really useful and will help you to learn all the important and difficult topics. Sound is produced only when some material body is made to vibrate. Muscles attached to vocal cords make it tight or loose. So, basically sound helps us to communicate with the other person. Answer: Magnesium ribbon burns with dazzling light and substance formed is magnesium oxide. How is sound produced and how is it transmitted and heard by us? Different materials produce different pitches; if an object vibrates quickly we hear a high-pitched sound, and if an object vibrates slowly we hear a low-pitched sound. (You may discuss your ideas with your partner.) 6. Question 2. Short Q&A: Q1: Discuss the importance of sound in our life. Ans: Sound plays an important role in our life; Sound helps us to communicate with one another.Sound is so important because animals are able to hear events all around them, no matter where their attention is focused or not. So the roaring of a lion is different than the sound of a mosquito. (c) there is evolution of heat. /ɑ:/ not /æ/. Speak in a high voice (like you just had some helium), this is a high pitch. Q29. Explanation: For the sound to travel, it requires a medium. These waves form a large shock wave. You hear them as sounds. Next: What are Ultrasonic Sounds? (i) Noise is unpleasant, jarring and disagreeable to the ear. Take two rubber strips of same size.Place these two rubber strips one over the other. It travels in form of waves through matter and moves in to and fro direction. Question 3: Humans produce voice from which organ? The portion of medium above the mean level is called crest. The sound you hear will increase in volume if the rubber band is pulled tightly. Our vocal cords produce sound in a similar manner. Question 2: What is vibration? Sound can travel through solids, liquids and gases. The sound that we hear around us is the type of energy made by the vibration that travels through the air or any other medium and can be heard when it reaches a person's ear. Q2: Sound can travel through. (b) False : The number of oscillations per second of a vibrating object is known as its frequency. The hearing range of human ear is (a) 20 Hz to 20,000 Hz (b) less than 20 Hz If the amplitude of vibration is large, sound is feeble. Answer: (a) gas bums and produces heat and light. View Answer. Answer: The examples of non-metals are sulphur, carbon, oxygen, phosphorus, etc. Ans: Sound is a sequence of waves of pressure that propagates through compressible media such as air or water. Download includes the following worksheets: Sound is the term to describe what is heard when sound waves pass through a medium to the ear. Hence, the sound is a wave. Number of vocal cords in human is: We Think the given NCERT MCQ Questions for class 8 Science book Chapter 13 Sound with Answers Pdf free download will assist you. Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans. …………………. Name five sounds that we make without speaking. Use your own ideas along with the ideas in the poem. 5. Depending upon the vibrations, a sound is produced. Q30. Source of sound and its propagation : A source of vibration motion of an object is normally a source of sound. Video Explanation (c) The loudness of sound is measured in hertz. Keep the stretched rubber strip in front of your mouth and blow air through the thin gap between them. Sound waves will be absorbed by your hand when you pluck the rubber band. (T/F) View Answer. Answer: Consider The Following Statements And Choose The Correct One: (a) The pitch of a sound depends on the frequency of vibration. Q. Question 31. The ɑ: sound is normally spelled with the letters 'a-r' as in the words: start . Question 3: Humans produce voice from which organ? Answer: Voice box (larynx) Question 5: Name the organs of hearing in our body. Answer: It is voice box in humans, that produces sound. Rewrite the false statements correctly. 13.9 (a), (b) : Working of vocal cor ds The vocal cords in men are about 20 mm long. Generally, the farther one moves from the drum, the quieter it sounds. Write a paragraph about beauty. For example, we can hear the musical instruments like tabla, flute, a guitar due to vibration. Answer: Sound cannot be produced without any vibration. Q29. What is sound and how is it produced? 3. In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. The rubber band will vibrate slower and produced a lower pitch. Question. Questions. Give any four sources of sound in a market place. (b) its frequency. . Has a slit, through which air is forced out by the lungs. There are two basic types of wave, transverse and longitudinal, differentiated by the way in which the wave is propagated. Characteristics of the medium required for the propagation of sound: (i) Medium must be elastic so that the medium particles have the tendency to return back to their original positions after . Statement 2: Loudness of a sound depends on the amplitude of vibrations. Question 1: What is sound? Have the class use their shakers to make a high pitch sound. Sound Class 8 Extra Questions Very Short Answer Type. What happens to the sound when the amplitude of vibration is large and vice versa? The distance can be found using d = v • t resulting in an answer of 25.5 m. Use 0.075 seconds for the time since 0.150 seconds refers to the round-trip distance. (ii) Sound requires a medium for propagation. It is a grade wherein you need to understand all the fundamentals which will help you to score more marks in your further grades. Explosion involves the evolution of. Answer: (a) True : Sound needs a medium to travel through. Some sounds may fall into more than one category. Worksheet Bundle 2. Answer: Sound is a kind of wave which gives us sense of hearing. Medium Solution Verified by Toppr Sound is defined as vibrations that travel through the air or another medium as an audible mechanical wave. For human ears, the audible range is 20 Hz to 20,000 Hz. Sound is a kind of (a) work (b) energy (c) force (d) pressure Answer Question 3. Soln: Answer is (d) solids, liquids and gases. Ans1.Clapping,laughing, whistling, crying and coughing are some of the sounds that we make without speaking. (d) none of these. It is produced from a vibrating body. You can also take a piece of paper with a narrow slit and hold it between your fingers as shown in Fig. Question 4. Boom Box. Exercise Questions. Sound is produced by vibrating objects. 4. Ans: Time taken by an object to complete one oscillation is called time period. What part in humans produces sound? around it to vibrate thus producing sound. Download Formulae Handbook For ICSE Class 9 and 10. Question 20: Give some examples of metals. In this educational science video for kids, youw ill learn abo. (ii) The portion of medium below the mean level is called trough. (ii) It is produced by periodic vibrations which are regular and continuous. Answer: Musical sound. Sound waves are created by a disturbance that then propagates through a medium (e.g., crust, water, air). 1. Noise. Question 2: Define the term Amplitude. If you were deep underwater in a submarine, the sounds of the ocean you could hear are as complex as the ones in you hear in your backyard. Sound Class 8 MCQs Questions with Answers Choose the correct option. The minimum distance between the source and the reflector, so that an echo is heard is approximately. We can also say that it is a form of energy and it comes from vibrations. As the air blows through the stretched rubber strips, a sound is produced. Revision Notes for Physics Chapter 8 Electricity makes it . Identify the metals and non-metals from A, B, C and D. Answer: A and D are metals. While the physiological definition includes a subject's reception of sound, the physics definition recognizes that sound exists . Remind students that a high pitch sound can be made by making . On a hot summer day, a pesky little mosquito produced its warning sound near your ear. 2Mg (s) + O 2 (g) → 2MgO (s) Activity 1.2. One of the best and most effective ways to score more marks in CBSE Class 8 is by referring to TopperLearning study materials which include video lessons, revision notes, question banks and sample . (b) A sound with large amplitude is louder than one with small amplitude. This activity requires a boom box, paper plate, small pieces of paper and balloons. (b) False : The number of oscillations per second of a vibrating object is known as its frequency. Question 4: Name the sound producing organ in humans. There are four materials A, B, C and D. A and D are hard and shiny, but B and C are dull and not very hard. …………….. 3. Sound is a series of compression and rarefraction waves that can travel long distances. B and C are non-metals. Answer : A sensation produced in the brain by the action on the eardrum of air borne or other vibration. In this lesson, we learned that sound travels in waves . Sound of single frequency is called a. Q28. When an object vibrates, it causes the surrounding air molecules to vibrate, initiating a chain reaction of sound wave vibrations throughout the medium. Answer: Sound is a form of energy. Question 1. 2. The sound produced by the drum is louder two metres from the drum if it is in a small bathroom, than if it is struck in the middle of a football field. Question 2. Lesson 8 - Sound and Noise Answer the following questions in short: Ques1. The lower the frequency of vibration, the higher is the pitch. Vibration is a periodic back-and-forth . Access Answers of Science NCERT Class 8 Chapter 13 Sound. (iii) Light and sound both require a medium for propagation. (i) Musical sound is pleasant, smooth and agreeable to the ear. These waves can travel through solids, liquids and sufficiently dense gases. Number of vocal cords in human is: We Think the given NCERT MCQ Questions for class 8 Science book Chapter 13 Sound with Answers Pdf free download will assist you. (iv) Sound travels slower than light. Answer: Such instruments are manjira, ghatam, kartal, dholak, etc. Why does an empty vessel produce more sound than a filled one . Characteristics of Sound. Depending upon the vibrations, a sound is produced. Sounds are made when objects vibrate. Very Short Answer Type. NCERT Question 3 (d) - In the following statements, tick T against those which are true, and F against those which are false: For human ears, the audible range is 20 Hz to 20,000 Hz. Wind musical instruments produced musical sounds by the vibration of air columns inside them. True or False 1) In sound waves,movement of particles occurs- 2) Direction of propagation is a . Choose the correct answer. Statement 1: The note heard in the vibration of 30 cm ruler is louder when flicked with larger amplitude. Discuss sound energy and what happens when you . Hearing Human ear Answer: Sound is a form of energy produced and transmitted by a vibrating matter. 12 The pitch of sound depends on. In physics, sound is produced in the form of a pressure wave. 25. Sound can travel through (a) gases only (b) solids only (c) liquids only (d) solids, liquids, and gases Answer: (d) solids, liquids, and gases. Answer : Sound is produced by the vibrations of material objects. Have a glance at the MCQ of Chapter 13 Science Class 8 and cross-check your answers during preparation. Answer: Lead nitrate reacts with potassium iodide to form lead iodide which is insoluble in water and yellow in colour. How do leaves make sound? Question 3. The nature of sound waves is. The vibration makes the air around the object vibrate and the air vibrations enter your ear. Vibration can be described as a back and forth motion of an object. It is similar to the /æ/ sound, but the two little dots mean that it is a longer sounds. A) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. NCERT Solutions for Class 8 Science Chapter 13 Sound in English and Hindi Medium (Adhyay 13: Dhwani) to Study online or View in Video Format or download free in PDF file updated for academic session 2022-2023 following new CBSE Syllabus and based on new NCERT Books. Sound Class 8 Science NCERT Textbook Questions Question 1. In a wind musical instrument a column of air enclosed in a wooden tube on metal tube vibrates and produces musical sound. 2. Next, place a paper plate that holds small pieces of paper on top and place it on top of the boom box. Voice of which of the following is likely to have a minimum frequency? Sound is a form of energy which is produced as a result of the vibrations of an object. Read the given statements and select the correct option. Solid and gas. Our vocal cords produce sound in a similar manner. View Answer. If one is subjected to loud unpleasant sound continuously for a long time, then it may cause temporary hearing impairment. …………….. 6. What is it called? In a transverse wave, such as the wave generated in a stretched rope when one end is wiggled back and forth, the motion that constitutes the wave is . Question 1. C Both A and B. In human physiology and psychology, sound is the reception of such waves and their perception by the brain. All sounds are made by vibrations of molecules through which the sound travels. It is said that "The loudness of sound depends on its amplitude". It is that external physical cause which affects the ear to produce the sensation. Fill in the blanks with suitable words. What Is Sound ? Ques2. As an object, such as a piano string, vibrates, it sets the air around it into motion. Answer: Do it yourself as each one of us has a different concept of beauty. The male vocal chords are between 17 mm and 25 mm in length whereas of a woman are between 12.5 mm and 17.5 mm long. 2. Pitch is the quality of a sound (high or low) and depends on the speed of the vibrations. Sound waves are produced by vibration that causes the molecules of a medium to form alternating high- and low-pressure fronts. (b) If the frequency of vibration is low, the sound produced has a low pitch. When sound waves travel through a medium, the particles of the medium vibrate. Answer: The to and fro or back and forth motion of an object is called vibration. Which of the following statements are correct? View Answer. Every object has a unique natural frequency of vibration. 1. Sound can travel through (a) gases only (b) solids only (c) liquids only (d) solids, liquids and gases. (a) Sound has three properties-loudness, frequency and quality. rubber strips, a sound is produced. The sound produced in the voice box called larynx located at the upper end of the windpipe. The return time of the sound depends on the depth of the ocean. Physics Interview Questions . The velocity of sound at 20°C is approximately. The sound produced by a marble cutter, on the other hand, may not be as . 4. For instance, when a drum or a cymbal is struck, the object vibrates. Sound is produced due to the vibration of objects. Sound, Sound and its Propagation. Vibration can be described as a back and forth motion of an object. Vibrations reach the ear and then the brain which senses them and we recognize sound. Ans. Question 2. It is produced by the vibration of the . Gaurav knows that wires can be made from copper and aluminium. (b) material suddenly bursts into flames. Have students share how the sound they made was different than the shaking sound. (ii) It is produced by irregular vibrations which are discontinuous. (c) its time period. Bats detect the obstacles in their path by receiving the reflected ______. 3. Name some of the musical instruments which are simply beaten or struck to produce music. NCERT Solutions 2022-23 as well as Offline Apps 2022-2023 of other subjects are . Hence, the sound is a wave. CBSE Class 8 is one of the crucial grades in your academic career. The study of sound should begin with the properties of sound waves. Very Short Answer Type. Answer: (a) True : Sound needs a medium to travel through. Baby girl is likely to have minimum frequency. Answer. Question 3. Because of the central role played by sound in speech communication, it is important to have a good understanding of how sound is produced, modified, and measured. The air causes a standing wave vibration in the air column inside of the trumpet, which travels down the instrument and is then manipulated by the pressing of the keys. (i) Sound is produced by vibrations. Question 8. (c) False : When the amplitude of vibration of a sound is large, the sound is very loud. Statement 1: The note heard in the vibration of 30 cm ruler is louder when flicked with larger amplitude. ICSE Class 8 Physics Chapter 8 Electricity Revision Notes . Answer: The examples of metals are iron, copper, aluminium, calcium, magnesium, etc. Activity 1.3. Find pictures of beautiful things you have seen or heard of. Now blow through the slit and listen to the sound. What makes different sounds happen? Individual particles are not transmitted with the wave, but the propagation of the wave causes particles (e.g., individual air molecules) to oscillate about an equilibrium position. Activity 1.1. Amplitude is how big the wave is, and this affects volume. A trumpet makes sound when the musician makes a buzzing sound while blowing air through closed lips and into the mouthpiece. When a wave travels through a medium ______. 13.9 (b). Answer: Metals like sodium and potassium are soft and can be cut with a knife. Since vacuum do not provide any medium, sound cannot travel through it. Read the given statements and select the correct option. Since vacuum do not provide any medium, sound cannot travel through it. →. Question 19: Give some examples of non-metals. 2. (b) Woman produces sound of higher pitch. (d) All the above. Sound of single frequency is called a. Q28. All sounds are a combination of pure frequencies. Using sound to navigate › Flying at the speed of sound › When a plane travels at the speed of sound, sound waves pile up in front of it. (a) (b) Fig. ICSE Class 10 Physics. (c) False : When the amplitude of vibration of a sound is large, the sound is very loud. rubber strips, a sound is produced. Rapid combustion occurs when. The velocity of sound at 20°C is approximately. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students. The sound produced by a lion is of low pitch (frequency) but the sound produced by a mosquito is of high pitch. You can also take a piece of paper with a narrow slit and hold it between your fingers as shown in Fig. ICSE Class 8 Revision Notes for Physics Chapter 8 Electricity can be very helpful for students to recall all their previously learned chapters and concepts quickly and conveniently, especially during exams when they have to revise the whole syllabus in a limited time period. Question 1. We have to pump air into the wind instrument to make it work and produce sound. How do humans produce sound? (c) If the frequency of vibration is high, the sound produced has a high pitch. Students should refer to Sound ICSE Class 10 Physics notes provided below designed based on the latest syllabus and examination pattern issued by ICSE. Question 14. Have your child try it. For instance, the sound produced when an aeroplane takes off is both loud and unpleasant. Answer: (a) Woman has short vocal chords. So, sound is produced when an object vibrates. These vibrations create sound waves which move through medium such as air and water before reaching our ears. Question 1: What is a sound? (d) its speed. The speed of the sound wave is 340 m/s. If you were both on the moon ,your friend will not be able to hear you call. (a) (b) Fig. B It is directly proportional to the square of amplitude of vibration, square of frequency and density of the medium. The voice box is also called as (a) stomach (b) heart (c) larynx (d) mouth Answer Question 2. Sound can be of different types—soft, loud, pleasant, unpleasant, musical, audible (can be heard), inaudible (cannot be heard), etc. The sound produced by a body differs from that produced by another body basically by its pitch. D Neither A nor B. Blow up a balloon and hold it in front of a boom box speaker. Answer: The to and fro or back and forth motion of an object is called vibration. Answer: The four sources of sound in a market place are: 1. Question 6: Name that part of ear which vibrates when outside sound falls on it. (a) Baby girl (b) Baby boy (c) A man Question 14: Mark the following statements true or false. How Is Sound Produced ? October 8, 2021 March 12, 2022 admin. The nature of sound waves is. A It is inversely proportional to the square of the distance of point from the source. A sound wave is both the end product of the speech production mechanism and the primary source of raw material used by the listener to recover the speaker's message. Ans2.Leaves of the trees make rustling sound when the wind . Question 2: What is vibration? 13.9 (b). The number of oscillations per second of a vibrating object is called its time period. Now blow through the slit and listen to the sound. Statement 2: Loudness of a sound depends on the amplitude of vibrations. When this wave reach eardrum it makes the eardrum to vibrate. Answer : TRANSVERSE WAVES 1.It is that type of waves in which particles of a medium moved at right angle to the direction of propagation of waves . Ans: A low-frequency vibration is produced by a drum. Answer: Sound is produced when an objects vibrates. For example : Shehnai, flute, nadaswaram and trumpet. A) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. Then, turn up the volume and observe. Sound is a form of energy which produces a sensation of hearing in our ears. Then have them speak in a very low voice (I told Ben to talk like Daddy), this is a low pitch. Question 1. Name the following Distance from the mean position to the top of the crest- Distance travelled by the wave- Source of vibration of wave-. A trumpet has three rotary valves that change the . Sound pressure also depends on the environment in which the source is located and the listener's distance from the source. 1. Hold the two ends of the rubber strips in your hands and stretch them tightly. Q27. Sound : Sound is a form of energy which produces a sensation of hearing in our ears. A sound is a form of energy that is produced when air molecules vibrate in a particular pattern called waves. Sources of sound consist usually vibrations of strings, membranes of air columns. Question 2. Using sound to navigate › Underwater echoes are used by ships to scan the ocean floor. (a) gas bums and produces heat and light. Q30. Production of Sound. Read on for an explanation of how sound travels. You cannot always see the . a) Time taken by an object to complete one oscillation is called _________. As a result, it makes a low-pitched sound. To produce the sound put your tongue low and at the back of your mouth, then make a long voiced sound with you mouth open. Very Short Q&A: Q1: Define sound. Answer: Sound is a kind of wave which gives us sense of hearing. Question 3. Concepts covered in Concise Physics Class 8 ICSE chapter 7 Sound are Properties of Sounds, Characteristics of a Sound Wave, Sound, Propagation of Sound, Representation of a Wave, Loudness and Intensity, Pitch (or shrillness) and . What causes it to produce? Question 1. 13.9 (a), (b) : Working of vocal cor ds The vocal cords in men are about 20 mm long. Sound Class 8 Extra Questions HOTS. 2 vocal cords get stretched across in the voice box. A whistle, on the other hand, has a high frequency and hence generates a higher pitch sound. Sound. When sound travels through air, the air particles ______. A sound is a form of energy that is produced when air molecules vibrate in a particular pattern called waves. Q27. The rubber band will vibrate faster and produce a higher pitch. Question 1: What is sound? The loudness of sound depends on: (a) its amplitude. Short Answers. Answer: Both A and B. Sound is in every part of our life, but how is sound made? (This is where the word amplifier comes from.) 4. The vibrating body causes the medium (water, air, etc.) Sound changes depending on how fast or slow an object vibrates to make sound waves. ……………….. 5. Sounds. - Facebook < /a > ans: Time taken by an object is normally a source of vibration is.! Near your ear by a mosquito is of low pitch tube on tube... Hz to 20,000 Hz ) how is sound produced class 8 short answer bums and produces heat and light i told to. 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