Maharashtra Board Class 6 Science Chapter 13 Sound Solutions

Std 6 Science Chapter 13 Sound Question Answer Maharashtra Board

Class 6 Science Chapter 13 Sound Question Answer Maharashtra Board

1. Fill In The Blanks With The Proper Words.

Question a. The propagation of sound does not occur through a ................

Answer: vacuum
In simple words: Sound needs a medium to travel; it cannot spread through an empty space like a vacuum.

🎯 Exam Tip: Remember that sound is a mechanical wave, requiring particles to vibrate and transmit energy.

Question b. Noise pollution is a ................ issue.

Answer: social/serious
In simple words: Noise pollution is a significant problem affecting society and can have serious health and environmental consequences.

🎯 Exam Tip: Understanding noise pollution as a 'social' issue highlights its widespread impact on communities and quality of life.

Question c. The sound which is disagreeable to our ears is called ................

Answer: noise
In simple words: Noise refers to any unwanted or unpleasant sound that causes discomfort.

🎯 Exam Tip: Distinguish between 'sound' which can be pleasant or unpleasant, and 'noise' which is inherently disagreeable.

Question d. Noise has adverse effects on our ................

Answer: health
In simple words: Excessive or continuous noise can negatively impact human well-being, leading to various health problems.

🎯 Exam Tip: When discussing adverse effects, focus on tangible impacts like health issues (stress, hearing loss) and environmental damage.

2. What Should We Do?

Question a. The silencer of a motorcycle is broken.

Answer:
1. If the silencer of a motorcycle is broken, vehicle should be immediately taken to the garage for repair.
2. If silencer is not maintained properly, it will continue making loud noise on the road while in motion, resulting in increasing noise pollution.
In simple words: A broken silencer makes a lot of noise, so it needs immediate repair to prevent noise pollution and ensure proper vehicle function.

🎯 Exam Tip: Practical problem-solving questions require direct actions and explain the consequence of inaction.

Question b. A factory in the surrounding is producing continuous loud noise.

Answer: Factories should be located at a proper distance away from residential areas. Authorities should be contacted who will control the decibel level.
In simple words: To manage continuous factory noise, factories should be built far from homes, and authorities should be informed to enforce noise limits.

🎯 Exam Tip: Solutions for industrial noise pollution involve both zoning regulations and regulatory enforcement.

3. Write The Answers In Your Own Words.

Question a. What is meant by vibration?

Answer: Vibration of an object is necessary for the production of sound. As long as the object vibrates, the sound is heard. When the vibration stops, the sound also stops.
In simple words: Vibration is the back-and-forth movement of an object, which is essential for creating and sustaining sound.

🎯 Exam Tip: Always link the production of sound directly to the concept of vibration; they are intrinsically connected.

Question b. Explain with the help of practical examples how sound is propagated through solids.

Answer:
In simple words: (No answer text provided in OCR for this question.)

🎯 Exam Tip: (No answer text provided in OCR for this question.)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र विभिन्न प्रकार की ध्वनियों को दर्शाता है। इसमें एक लड़की गा रही है, पक्षी चहचहा रहे हैं, पटाखे फूट रहे हैं, लोग फुसफुसा रहे हैं, एक लड़का सीटी बजा रहा है, एक बांसुरी बज रही है, एक हॉर्न बज रहा है, और एक कुत्ता भौंक रहा है। यह दृश्य ध्वनि के विभिन्न स्रोतों का एक संक्षिप्त अवलोकन प्रदान करता है।

Answer:
1. Singing
2. Chirping of birds
3. Bursting of crackers
4. Whispering
5. Whistling
6. Flute
7. Honking
8. Dog barking
In simple words: The diagram illustrates various sound sources, from natural occurrences like birds chirping to human-made sounds like singing or honking.

🎯 Exam Tip: When analyzing diagrams, clearly identify and list each element depicted, especially when asked to enumerate sounds or actions.

Question c. What is meant by noise pollution?

Answer: Continuous noise which has ill effects is called noise pollution.
In simple words: Noise pollution is harmful or annoying sound that continues for too long and affects health or the environment.

🎯 Exam Tip: Define noise pollution by focusing on its continuity and negative impact, rather than just loudness.

Question d. What measures will you take to control noise pollution?

Answer: Measures for preventing noise pollution:
1. As far as possible, we should avoid blowing horns.
2. The volume of the TV or radio in the house should be restricted to those watching the programmes.
3. Vehicles should be maintained properly to reduce the unnecessary sounds they produce.
4. Factories, airports, railway stations and bus stands should be located at the proper distance away from residential area.
5. Planting of trees helps reduce noise as trees act as a natural barrier.
In simple words: To control noise pollution, we should avoid unnecessary honking, keep TV/radio volumes low, maintain vehicles, locate noisy places away from homes, and plant more trees.

🎯 Exam Tip: Provide a diverse set of solutions, covering individual actions, technological fixes, urban planning, and environmental measures.

4. Complete The Table.

Question a.

Nature of sound	Unpleasant	Pleasant
Speaking
Whispering
Aeroplane sounds
Horns of Vehicles
Railway Engine
Rustling of leaves
Neighing of a horse
Ticking of a clock

Answer:

Nature of sound	Unpleasant	Pleasant
1. Speaking		✓
2. Whispering		✓
3. Aeroplane Sounds	✓
4. Horns of Vehicles	✓
5. Railway Engine	✓
6. Rustling of leaves		✓
7. Neighing of a horse	✓
8. Ticking of a clock		✓

In simple words: This table categorizes common sounds as either pleasant or unpleasant, based on their typical perception.

🎯 Exam Tip: For table completion, carefully consider the common experience of each sound to correctly classify it as pleasant or unpleasant.

Project:

Question 1. Prepare a list of the harsh sounds mheard near your house. Write about those sounds which produce noise pollution.

Answer: (Answer to be written by students based on their observations.)
In simple words: Students should list loud, irritating sounds from their surroundings and explain why those specific sounds contribute to noise pollution.

🎯 Exam Tip: For project-based questions, personal observation and clear articulation of impact are key scoring points.

Question 2. Collect information about places where loud noise is prohibited and discuss why it is so.

Answer: (Answer to be written by students based on their research.)
In simple words: Research areas like hospitals, schools, and silent zones where loud noise is banned, and understand the reasons behind these prohibitions.

🎯 Exam Tip: Focus on linking specific silent zones (e.g., hospitals, libraries) to the needs of the people in those areas (e.g., rest, concentration).

Class 6 Science Chapter 13 Sound Important Questions And Answers

Fill In The Blanks:

Question 1. Some sounds are ................ and are heard easily.

Answer: loud
In simple words: Loud sounds are those that are easily perceived without needing close attention.

🎯 Exam Tip: Differentiate between loud and soft sounds based on their audibility and intensity.

Question 2. Some sounds are very ................ and cannot be heard unless we listen attentively.

Answer: soft
In simple words: Soft sounds are quiet and require focused listening to be detected.

🎯 Exam Tip: Contrast soft sounds with loud sounds, noting the level of attention required to hear them.

Question 3. As long as the object ................ the sound is heard.

Answer: vibrates
In simple words: Sound is produced only when an object is vibrating.

🎯 Exam Tip: Reinforce the direct correlation: no vibration, no sound.

Question 4. When the vibration ................ the sound also stops.

Answer: stops
In simple words: Once the vibration of an object ceases, the production of sound also ends.

🎯 Exam Tip: This illustrates the transient nature of sound, linked to the duration of vibrations.

Question 5. The intensity of sound is measured in a unit called ................

Answer: decibels(dB)
In simple words: Decibels (dB) are the standard units used to quantify how loud or intense a sound is.

🎯 Exam Tip: Knowing the correct unit of measurement for sound intensity is crucial for scientific accuracy.

Question 6. The voice box is located in our ................

Answer: throat
In simple words: The voice box, also known as the larynx, is situated in the throat and is responsible for producing vocal sounds.

🎯 Exam Tip: Connect the voice box (larynx) to its function in sound production in humans.

Question 7. Sound travels in the form of ................ through air, water and ................

Answer: waves, solids
In simple words: Sound moves as waves through various mediums like air, water, and solid materials.

🎯 Exam Tip: Emphasize that sound requires a medium to propagate and travels as waves.

Question 8. The sound is propagated more clearly through a ................ than through air.

Answer: solid
In simple words: Sound travels more efficiently and clearly through solids compared to air.

🎯 Exam Tip: Remember the order of sound propagation efficiency: solids > liquids > gases.

Question 9. Transmission of sound occurs at a different ................ through different mediums.

Answer: speed
In simple words: Sound travels at varying speeds depending on the material it passes through.

🎯 Exam Tip: The speed of sound is not constant; it changes with the density and elasticity of the medium.

Question 10. Continuous noise which may have ill effects, is called noise ................

Answer: pollution
In simple words: Ongoing, harmful noise is termed noise pollution.

🎯 Exam Tip: Ensure your definition of noise pollution includes both 'continuous' and 'ill effects'.

Question 11. Some of the sounds that we enjoy can be a ................ for others.

Answer: nuisance
In simple words: A sound enjoyable to one person might be annoying or bothersome to another.

🎯 Exam Tip: Recognize the subjective nature of sound perception; what is pleasant to one person might be a nuisance to another.

Question 12. The vibration of an object is necessary for the ................ of sound.

Answer: production
In simple words: For sound to be created, an object must vibrate.

🎯 Exam Tip: Always link vibration as the fundamental cause for the production of sound.

Answer In One Sentence.

Question 1. List characteristics of sound.

Answer: Sounds are soft, loud, pleasant and unpleasant.
In simple words: Key characteristics of sound include its loudness (soft or loud) and its quality (pleasant or unpleasant).

🎯 Exam Tip: Focus on simple, observable qualities of sound for this type of question.

Question 2. What do you mean by unpleasant sounds?

Answer: The sounds by which we get annoyed are called unpleasant sounds.
In simple words: Unpleasant sounds are those that irritate or bother us.

🎯 Exam Tip: Unpleasant sounds are primarily defined by the negative emotional or physiological response they evoke.

Question 3. What do you mean by loud and soft sounds?

Answer: The sounds which are heard easily, are loud sounds and the sounds which cannot be heard unless we listen attentively, are soft sounds.
In simple words: Loud sounds are easily heard, while soft sounds are quiet and require careful listening.

🎯 Exam Tip: Differentiate loud and soft sounds based on their intensity and the effort required to perceive them.

Question 4. Which movement is exhibited by diaphragm of a speaker and a tabla?

Answer: Diaphragm of a speaker and a tabla exhibit rapid oscillatory motion which gives rise to vibrations.
In simple words: The diaphragms of speakers and tablas move rapidly back and forth (oscillate) to create vibrations, which then produce sound.

🎯 Exam Tip: Focus on the specific type of motion (oscillatory) and its direct consequence (vibrations leading to sound).

Question 6. What is source of the sound?

Answer: The object due to which sound is produced is called the source of the sound.
In simple words: The source of sound is the object that produces the sound.

🎯 Exam Tip: A simple, direct definition is best; the source is always the origin of the sound.

Question 7. What is acoustics?

Answer: The science of sound, resonance, production, propagation and effects of sound is called acoustics.
In simple words: Acoustics is the scientific study of how sound is created, travels, and affects things.

🎯 Exam Tip: Remember that acoustics is a comprehensive study covering all aspects of sound, from its origin to its impact.

Question 8. What produces sound in living beings?

Answer: The vibration of the vocal chords in our larynx or voice box produces sound.
In simple words: In living beings, sound is made when vocal cords in the voice box vibrate.

🎯 Exam Tip: Identify vocal cords and the larynx as the key anatomical structures for sound production in animals and humans.

Question 9. On what does quality of sound depend?

Answer: Quality of sound produced in the larynx depends upon the tautness of the vocal chords.
In simple words: The quality of sound from the voice box changes based on how tight or loose the vocal cords are.

🎯 Exam Tip: The 'quality' of sound often refers to its timbre or tone, which is influenced by the physical properties of the vibrating source.

Question 10. How is sound propagated?

Answer: The sound is propagated in the form of waves through air, water or through a solid.
In simple words: Sound spreads as waves through different materials like air, water, or solids.

🎯 Exam Tip: Emphasize that sound travels as waves and requires a medium for propagation.

Question 11. Why is sound heard more clearly through solids?

Answer: Transmission of sound occurs at a different speed through different mediums. Transmission of sound is faster through a solid than through a liquid and gas.
In simple words: Sound travels faster and more efficiently through solids because their particles are closer together, allowing vibrations to pass more easily than in liquids or gases.

🎯 Exam Tip: Relate the clarity and speed of sound propagation to the density and molecular arrangement of the medium.

Question 12. What is noise?

Answer: A loud sound is harsh to ears. Such sounds produce noise.
In simple words: Noise is any loud, unpleasant sound that is irritating to hear.

🎯 Exam Tip: The key defining features of noise are its loudness and its disagreeable nature.

Question 13. List the effects of very loud or continuous noise on the people.

Answer:
1. Very loud or continuous noise can cause hearing impairment.
2. This can even lead to deafness.
3. It also causes restlessness, irritability and mental exhaustion.
In simple words: Very loud or constant noise can damage hearing, potentially cause deafness, and lead to stress, irritation, and tiredness.

🎯 Exam Tip: When listing effects, include both physical (hearing damage) and psychological (stress, irritability) impacts.

Question 14. What is noise pollution?

Answer: Continuous noise which has ill effects is called noise pollution.
In simple words: Noise pollution is harmful noise that persists over time, negatively affecting health and environment.

🎯 Exam Tip: Emphasize the two core components of noise pollution: its continuous nature and its detrimental effects.

Question 15. How can we prevent noise pollution with respect to watching TV?

Answer: The volume of the TV or radio in the house should be restricted to those watching the programmes.
In simple words: To prevent noise pollution from TV or radio, keep the volume low enough only for those watching to hear it.

🎯 Exam Tip: Simple, everyday actions like managing media volume are effective ways to control household noise pollution.

Explain The Terms.

Question 1. Propagation of sound:

Answer: Sound is said to be propagated when sound waves spread in all directions from a source of sound.
In simple words: Propagation of sound means how sound waves travel outwards from their source.

🎯 Exam Tip: Focus on the movement and spread of sound waves from their point of origin.

Question 2. Medium of propagation of sound:

Answer: The substance around a source of sound through which sound waves spread is called the medium of propagation of sound.
In simple words: The medium of propagation is the material (like air or water) through which sound waves travel.

🎯 Exam Tip: Clearly define the medium as the physical substance that enables sound to travel.

Question 3. Which sounds do you hear during the recess in the school?

Answer: During the recess in the school, we hear.
1. laughing
2. students running
3. talking loudly
4. ringing of the bell
5. stamping on the staircase
6. shouting
In simple words: During school recess, common sounds include children laughing, running, talking, bell ringing, footsteps on stairs, and shouting.

🎯 Exam Tip: When describing a scene, list a variety of sounds to capture the full auditory experience.

Question 4. When there is silence in the classroom, close your eyes and sit quietly. Which sounds in your surroundings can you hear now?

Answer:
1. Loud: Laughing, running, talking, horn of cars, marriage procession, school band, teacher's voice in next classroom.
2. Pleasant: P.T. teacher's whistle, chirping of birds.
3. Unpleasant: Shouting, bell ringing, stamping on staircase, dog barking, horns of vehicles.
In simple words: In a quiet classroom, one might distinguish loud sounds (e.g., car horns, shouting), pleasant sounds (e.g., birds chirping, a whistle), and unpleasant sounds (e.g., dog barking, bell ringing).

🎯 Exam Tip: Categorize the heard sounds into loud, pleasant, and unpleasant to demonstrate understanding of sound characteristics.

Question 5. When a song is being played on a radio or a music system in the house, place your hand on its speaker. What do you feel? Put off the music. What do you feel now?

Answer:
1. When a hand is placed on the speakers of the music system, we feel vibrations on the hand.
2. When music is put off, we don't feel any vibrations on the hand.
In simple words: When music plays, you feel vibrations on the speaker; these vibrations stop when the music is turned off.

🎯 Exam Tip: This question tests direct observation and understanding of the link between sound and vibration.

Question 6. When a metal dish falls on the floor; it makes a loud noise. What do we do to stop the noise? What is the effect of that action?

Answer: To stop the noise of metal dish falling on the floor, quickly put hand on the dish. Vibrations of the metal dish are stopped and the noise stops.
In simple words: To stop the noise from a fallen metal dish, touch it to stop its vibrations, which in turn stops the sound.

🎯 Exam Tip: The key takeaway is that dampening vibrations directly leads to the cessation of sound.

Question 7. What is it that vibrates when the sounds of sitar, bell, water tap, and breaking of a saucer, etc. are produced?

Answer: Strings of the sitar, tongs of the bell, water drops hitting the floor of the basin, pieces of saucers that hit the ground vibrate to produce the sounds.
In simple words: The vibrating parts are the sitar strings, bell tongs, water drops, and pieces of broken saucer.

🎯 Exam Tip: Identify the specific part of each object that undergoes vibration to produce its characteristic sound.

Question 8. Take a pot full of water. Strike it lightly on the rim. What do you see? Why are waves formed on the water in the pot?

Answer:
1. We see ripples on the water.
2. When we strike the rim of the pot, our striking causes vibrations. These vibrations are transferred or moved from the pot to the water. Hence, water waves/ripples are seen on the water in the pot.
In simple words: Striking a water-filled pot causes ripples because the pot's vibrations transfer to the water, creating waves.

🎯 Exam Tip: Explain both the observation (ripples) and the underlying scientific principle (transfer of vibrations from pot to water).

Question 9. On rubbing balloon filled with water and another filled with air, of which balloon do we hear a clear or sound?

Answer: We hear a clearer sound of the water balloon.
In simple words: The water-filled balloon produces a clearer sound because sound travels better through water than air.

🎯 Exam Tip: Relate the clarity of sound to the density and transmission efficiency of the medium inside the balloon (water vs. air).

Question 10. If a bell is rung in a vacuum container, will its sound be heard outside?

Answer: Its sound will not be heard outside.
In simple words: A bell rung in a vacuum won't be heard because sound needs a medium to travel, and a vacuum has none.

🎯 Exam Tip: This question is a classic demonstration that sound is a mechanical wave and cannot propagate through a vacuum.

Observe And Discuss.

Observe The Figure And Answer The Questions.

ℹ️ चित्र व्याख्या (Diagram Explanation): इस चित्र में विभिन्न प्रकार की आवाज़ें पैदा करने वाले लोग दिखाए गए हैं। एक लड़का सामान्य रूप से चल रहा है, एक लड़की ज़ोर से गा रही है या चिल्ला रही है, और एक लड़का चिल्ला रहा है या चीख रहा है, जिससे विभिन्न प्रकार की ध्वनियाँ उत्पन्न हो रही हैं।

Question 1. Which of these sounds is pleasant?

Answer: The singing of the girl is a pleasant sound.
In simple words: The girl's singing is considered pleasant among the sounds shown.

🎯 Exam Tip: When identifying pleasant sounds, consider those typically associated with positive auditory experiences.

Question 2. Which sound is a nuisance to people?

Answer:
1. Boy shouting/screaming.
2. Boy moving/ walking with a toy rattle.
In simple words: The shouting/screaming boy and the boy with a toy rattle produce sounds that could be bothersome to people.

🎯 Exam Tip: Nuisance sounds are often loud, repetitive, or intrusive to others.

Observe The Figure And Answer The Following.

Question 1. Make a list of all sounds implied in the picture.

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक परिवार को घर में और उसके आसपास की गतिविधियों में व्यस्त दिखाता है। इसमें एक माँ बच्चे के साथ, पिता फ़ोन पर बात करते हुए, एक बच्चा रोता हुआ, और एक बच्चा ढोल बजाता हुआ है। घर के बाहर, पक्षी चहचहा रहे हैं और वाहन चल रहे हैं। यह एक व्यस्त घरेलू माहौल को दर्शाता है।

Answer:
1. Chirping of bird outside the house on the tree.
2. Collision of two vehicles - honking of the vehicles.
3. Baby crying.
4. Father talking on the phone.
5. Brother playing in the house - jumping.
6. Sister playing the drum - hitting the drum.
7. Sound of TV.
8. Dog barking.
9. Mother talking to the neighbour.
In simple words: The picture implies various sounds including bird chirping, vehicle collision and honking, baby crying, phone conversation, children playing and drumming, TV noise, dog barking, and mother talking.

🎯 Exam Tip: Thoroughly scan all elements of the picture, both indoor and outdoor, to infer all potential sound sources.

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