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Q1. The human voice box is also known as the:
The human voice box is also called the larynx. It is located at the upper end of the windpipe (trachea) and contains the vocal cords, which vibrate to produce sound. The trachea is the windpipe, the esophagus is the food pipe, and the pharynx is the throat passage.
Q2. Sound is produced by a:
Sound is produced when an object vibrates. The vibrations create sound waves that travel through a medium. A stationary object does not produce sound, and a moving object may not always produce sound unless it vibrates. A silent object does not produce sound.
Q3. The vocal cords are located in the:
The vocal cords are located in the larynx (voice box). They are two folds of tissue that vibrate when air passes through them, producing sound. The windpipe (trachea) carries air to the lungs, the food pipe (esophagus) carries food, and the ear is for hearing.
Q4. The eardrum is a part of the:
The eardrum (tympanic membrane) is a part of the ear. It is a thin, stretched membrane that vibrates when sound waves hit it, helping to transmit sound to the inner ear. It is not part of the nose, eye, or tongue.
Q5. Which part of the tabla vibrates to produce sound?
In a tabla, the stretched membrane (skin) vibrates to produce sound. When the membrane is struck, it vibrates and creates sound waves. The leather strap, metal ghungroo, and wooden body are not the primary vibrating parts.
Q6. Sound cannot travel through:
Sound cannot travel through a vacuum because it needs a medium (solid, liquid, or gas) to propagate. Sound waves are mechanical waves that require particles to transfer energy. Air, water, and steel are all media through which sound can travel.
Q7. The hearing range of human ears is approximately:
The human ear can hear sounds in the frequency range of approximately 20 Hz to 20,000 Hz. This is the audible range for humans. Frequencies below 20 Hz are infrasonic, and above 20,000 Hz are ultrasonic.
Q8. The stretched membrane of the mridangam is its:
The stretched membrane of the mridangam is its vibrating part. When struck, the membrane vibrates and produces sound. It is not a string, bow, or resonator, though the resonator amplifies the sound.
Q9. In humans, sound is produced by the:
In humans, sound is produced by the larynx (voice box). The vocal cords inside the larynx vibrate when air from the lungs passes through them. The lungs provide the air, the heart pumps blood, and the mouth shapes the sound, but the larynx is the source.
Q10. Which of these is a stringed musical instrument?
The veena is a stringed musical instrument. It produces sound through the vibration of stretched strings. Tabla and dhol are percussion instruments with membranes, and the flute is a wind instrument.
Q11. In a flute, the vibrating part is the:
In a flute, the vibrating part is the air column inside the flute. When air is blown into the flute, the air column vibrates and produces sound. It is not a string, membrane, or reed.
Q12. The larynx is located at the upper end of the:
The larynx (voice box) is located at the upper end of the windpipe (trachea). It is part of the respiratory system. The food pipe (esophagus) is separate, and the heart and backbone are not directly connected to the larynx.
Q13. Sound waves are:
Sound waves are mechanical waves. They require a medium (solid, liquid, or gas) to travel and are produced by vibrations. Electromagnetic waves like light do not require a medium. Sound is not a light wave or static wave.
Q14. The thin, stretched membrane at the end of the ear canal is called the:
The thin, stretched membrane at the end of the ear canal is called the eardrum (tympanic membrane). It vibrates when sound waves reach it and transmits the vibrations to the middle ear. The cochlea, anvil, and pinna are other parts of the ear.
Q15. Which of the following voices is most likely to have the highest pitch?
A baby’s voice has the highest pitch because the vocal cords are shorter and thinner. A grown-up woman has a higher pitch than a man, but a baby’s voice is typically the highest. Older men often have lower voices.
Q16. The vocal cords in men are usually:
Vocal cords in men are usually longer than in women. This is why men generally have deeper voices with lower pitch. Shorter vocal cords produce higher pitch, which is why women and children often have higher voices.
Q17. Which instrument uses a membrane to produce sound?
Tabla uses a stretched membrane (skin) to produce sound. When the membrane is struck, it vibrates and creates sound. The violin and sitar use strings, and the flute uses an air column.
Q18. We are able to hear the voice of our friend because sound travels through:
We hear sound because it travels through the air as a medium. Sound waves from our friend’s voice travel through the air to our ears. It cannot travel through a vacuum, and earth and fire are not typical media for sound.
Q19. The number of vocal cords in the human larynx is:
The human larynx contains two vocal cords. These folds of tissue vibrate to produce sound when air passes between them. They are sometimes called vocal folds. There are not one, three, or four vocal cords.
Q20. When we speak, air comes from the:
When we speak, air comes from the lungs. The lungs push air upward through the trachea and larynx, causing the vocal cords to vibrate and produce sound. The heart pumps blood, the stomach digests food, and the kidneys filter waste.
Q21. The sound from a flute is produced by:
The sound from a flute is produced by blowing air into it, which causes the air column inside to vibrate. Plucking strings is for stringed instruments, striking a membrane is for drums, and rubbing sticks is not a common method for flutes.
Q22. The correct path of sound in the human ear is:
The correct path of sound in the ear is: Pinna (outer ear) collects sound → Ear canal → Eardrum (vibrates). This is the sequence of sound entry. The cochlea is for later processing, and the other options have incorrect order.
Q23. A sound is produced when something:
A sound is produced when something vibrates. Vibration creates waves in the surrounding medium, which are detected as sound. Movement without vibration does not necessarily produce sound, and stopping or shining does not produce sound.
Q24. The eardrum is located between the:
The eardrum is located between the ear canal and the middle ear. It separates the outer ear from the middle ear. It vibrates when sound waves reach it and transmits these vibrations to the middle ear bones.
Q25. Which of these requires a medium to travel?
Sound from a bell requires a medium (solid, liquid, or gas) to travel. Light from the sun and X-rays are electromagnetic waves and do not need a medium. Heat from a fire can travel by radiation without a medium.
Q26. A deeper voice (low pitch) is produced when vocal cords are:
A deeper voice (low pitch) is produced when vocal cords are long and vibrate slowly. Longer vocal cords produce lower-frequency sounds. Short and fast vibrations produce higher pitch. Loose and thick or thin and tight affect quality more than pitch.
Q27. The main vibrating part in a veena is the:
The main vibrating part in a veena is the stretched string. When the string is plucked, it vibrates and produces sound. The gourd and hollow body act as resonators, and the frets help change the pitch. The string is the source of vibration.
Q28. Without the eardrum, a person would not be able to:
Without the eardrum, a person would not be able to hear. The eardrum is essential for receiving sound vibrations and transmitting them to the inner ear. It does not affect seeing, smelling, or tasting.
Q29. The ‘slit’ between the vocal cords, through which air passes, is called the:
The ‘slit’ between the vocal cords through which air passes is called the glottis. When air passes through the glottis, the vocal cords vibrate and produce sound. The epiglottis covers the trachea, the trachea is the windpipe, and the uvula is at the back of the throat.
Q30. Sound travels fastest in:
Sound travels fastest in solids because particles in solids are closely packed, allowing vibrations to be transmitted quickly. It is slower in liquids and slowest in gases. Sound cannot travel in a vacuum. Steel and wood are examples of solids where sound travels fastest.
Q31. The part of the ear that collects sound from the surroundings is the:
The pinna is the outer part of the ear that collects sound from the surroundings and directs it into the ear canal. The ear canal carries the sound, the eardrum vibrates, and the cochlea is involved in processing sound.
Q32. A vibrating object produces sound. If it stops vibrating, it will:
If a vibrating object stops vibrating, it will produce no sound. Sound is a result of vibration. Without vibration, there is no sound. It cannot produce louder sound or a different pitch, and echo is reflected sound.
Q33. The high pitch of a female voice is due to:
The high pitch of a female voice is due to shorter vocal cords. Shorter cords vibrate faster, producing higher-pitched sounds. Longer vocal cords produce deeper, lower-pitched sounds. Lung size and windpipe width do not primarily determine pitch.
Q34. The air column in a wind instrument vibrates because:
The air column in a wind instrument vibrates because air is blown into it. This causes the column of air to vibrate and produce sound. The material and hollowness are not the direct causes of vibration; blowing air is the mechanism.
Q35. The lungs help in sound production by:
The lungs help in sound production by pushing air through the vocal cords. The air stream causes the vocal cords to vibrate, producing sound. The lungs do not vibrate directly or filter air for sound; they provide the airflow needed for vibration.
Q36. In which of the following media will sound travel the slowest?
Sound travels slowest in air because gas particles are far apart. It travels faster in liquids and fastest in solids. Iron, water, and wood are denser media where sound travels faster than in air. Air is the slowest medium among the options.
Q37. The eardrum converts sound waves into:
The eardrum converts sound waves into vibrations. These vibrations are then transmitted to the middle ear bones and eventually to the inner ear, where they are converted into electrical signals for the brain. The eardrum itself does not produce electrical or light signals.
Q38. A musical instrument that produces sound by vibrating strings is a:
A sitar produces sound by vibrating strings. The strings are plucked to create sound. Dhol is a percussion instrument with a membrane, flute is a wind instrument, and shehnai is also a wind instrument. Sitar is a stringed instrument.
Q39. Children have a high-pitched voice because their vocal cords are:
Children have a high-pitched voice because their vocal cords are very short and thin. Short, thin cords vibrate faster, producing higher pitch. Longer and thicker cords produce lower pitch. Loose cords affect quality, not necessarily pitch.
Q40. The process of hearing begins when the pinna:
The process of hearing begins when the pinna collects sound waves from the surroundings and directs them into the ear canal. It does not vibrate, send signals to the brain, or amplify sound directly. The pinna’s main role is to capture sound.
Q41. Astronauts on the moon cannot talk to each other directly because:
Astronauts on the moon cannot talk to each other directly because there is no atmosphere on the moon to carry sound waves. Sound requires a medium to travel. Their suits, speed, and distance do not directly prevent sound travel; the lack of a medium is the main reason.
Q42. The stretched skin of a drum is its:
The stretched skin of a drum is its vibrating membrane. When struck, the membrane vibrates and produces sound. The resonator amplifies sound, and the handle and stick are not vibrating parts. The membrane is the primary source of sound.
Q43. The larynx gets its name “voice box” because it:
The larynx is called the “voice box” because it houses the vocal cords, which vibrate to produce sound. It does not amplify sound, filter air, or connect to the stomach. Its role in sound production is why it is called the voice box.
Q44. The vibrations from the eardrum are passed to the:
The vibrations from the eardrum are passed to the middle ear bones—the hammer, anvil, and stirrup. These bones amplify the vibrations and transmit them to the inner ear. The pinna and ear canal are before the eardrum, and the cochlea is after the bones.
Q45. A vacuum is a space where there is no:
A vacuum is a space where there is no matter (air, gas, or other particles). It is empty of matter. Light can pass through a vacuum, gravity can still exist, and energy can be present. Sound cannot travel in a vacuum because there is no matter to carry it.
Q46. Which of these is an example of a wind instrument?
The flute is an example of a wind instrument. Sound is produced by blowing air into it, causing the air column to vibrate. Tabla is a percussion instrument, and sitar and veena are stringed instruments.
Q47. The characteristic of sound that distinguishes a sharp note from a flat note is called:
The characteristic that distinguishes a sharp note from a flat note is pitch. Pitch depends on the frequency of sound waves. Higher frequency means higher pitch (sharp note), and lower frequency means lower pitch (flat note). Loudness, quality, and intensity are different characteristics.
Q48. To make a sound louder, we need to increase the:
To make a sound louder, we need to increase the amplitude of vibration. Loudness is directly related to the amplitude of the sound wave. Frequency determines pitch, speed is the speed of sound, and pitch is the highness or lowness of a sound.
Q49. The auditory nerve sends signals from the inner ear to the:
The auditory nerve sends signals from the inner ear to the brain. The brain processes these signals as sound. The heart, lungs, and eardrum are not involved in sending these signals to the brain.
Q50. A ringing bell is placed inside a jar. If the air is slowly removed from the jar, the sound will: NCERT
If air is slowly removed from the jar, the sound will become fainter and then stop. Sound needs a medium (air) to travel. As air is removed, the particles decrease, so sound transmission becomes weaker and eventually stops when the jar becomes a vacuum. This is a classic experiment to show that sound cannot travel through a vacuum.