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📘 Study MCQs
Q1. The human voice box is also known as the: NCERT
• Trachea
• Larynx
• Esophagus
• Pharynx
Answer: Larynx
The voice box in humans is medically termed the larynx. It is a hard, bony structure located at the top of the windpipe that houses the vocal cords.
Q2. Sound is produced by a: Science
• Stationary object
• Vibrating object
• Silent object
• Moving object
Answer: Vibrating object
Sound is a form of energy produced when an object vibrates. The vibrations create waves that travel through a medium to our ears.
Q3. The vocal cords are located in the: NCERT
• Windpipe
• Food pipe
• Larynx
• Ear
Answer: Larynx
The vocal cords are two bands of elastic tissue stretched across the larynx. They vibrate when air passes through them, producing sound.
Q4. The eardrum is a part of the: Science
• Nose
• Eye
• Ear
• Tongue
Answer: Ear
The eardrum is a thin, stretched membrane inside the ear. It vibrates when sound waves hit it and transmits these vibrations to the inner ear.
Q5. Which part of the tabla vibrates to produce sound? NCERT
• The metal ghungroo
• The leather strap
• The stretched membrane
• The wooden body
Answer: The stretched membrane
The tabla is a membranophone. When the membrane (pudi) is struck, it vibrates and sets the air inside the tabla into vibration, producing sound.
Q6. Sound cannot travel through: Science
• Air
• Water
• Steel
• Vacuum
Answer: Vacuum
Sound requires a material medium (solid, liquid, or gas) to travel because it needs particles to vibrate. A vacuum has no particles, so sound cannot pass through it.
Q7. The hearing range of human ears is approximately: NCERT
• 20 Hz to 20,000 Hz
• 5 Hz to 50 Hz
• 20,000 Hz to 50,000 Hz
• 1 Hz to 10 Hz
Answer: 20 Hz to 20,000 Hz
Humans can typically hear sounds in the frequency range of 20 hertz (Hz) to 20,000 hertz (20 kHz). This is known as the audible range.
Q8. The stretched membrane of the mridangam is its: NCERT
• String
• Vibrating part
• Bow
• Resonator
Answer: Vibrating part
Like the tabla, the mridangam is also a membrane drum. The stretched skin on both ends vibrates when struck to produce rhythmic sounds.
Q9. In humans, sound is produced by the: NCERT
• Lungs
• Heart
• Larynx
• Mouth
Answer: Larynx
While the lungs provide the air, the actual production of sound happens in the larynx (voice box) when the vocal cords vibrate.
Q10. Which of these is a stringed musical instrument? NCERT
• Tabla
• Flute
• Veena
• Dhol
Answer: Veena
The veena is a classical string instrument. Sound is produced by plucking the strings, which then vibrate.
Q11. In a flute, the vibrating part is the: NCERT
• Stretched string
• Air column
• Membrane
• Reed
Answer: Air column
The flute is a wind instrument. When air is blown into it, the column of air inside the hollow tube vibrates, creating different notes based on the length of the air column.
Q12. The larynx is located at the upper end of the: NCERT
• Food pipe
• Windpipe
• Heart
• Backbone
Answer: Windpipe
The larynx is positioned at the top of the trachea (windpipe). When we swallow, a flap called the epiglottis covers the larynx to prevent food from entering the windpipe.
Q13. Sound waves are: Science
• Mechanical waves
• Electromagnetic waves
• Light waves
• Static waves
Answer: Mechanical waves
Sound waves require a medium to travel, which is why they are classified as mechanical waves. They cannot travel through a vacuum.
Q14. The thin, stretched membrane at the end of the ear canal is called the: NCERT
• Cochlea
• Eardrum
• Anvil
• Pinna
Answer: Eardrum
The eardrum, or tympanic membrane, separates the outer ear from the middle ear. It is extremely sensitive and vibrates when sound reaches it.
Q15. Which of the following voices is most likely to have the highest pitch? Science
• A grown-up man
• A grown-up woman
• A baby
• An old man
Answer: A baby
Pitch depends on the frequency of vibration. Babies have very short and thin vocal cords, which vibrate very fast, producing a sound with a high pitch.
Q16. The vocal cords in men are usually: NCERT
• Shorter than women’s
• Longer than women’s
• Softer than women’s
• The same as women’s
Answer: Longer than women’s
Men typically have longer vocal cords (about 20 mm) compared to women (about 15 mm). Longer cords vibrate slowly, producing a low pitch or deep voice.
Q17. Which instrument uses a membrane to produce sound? NCERT
• Violin
• Flute
• Tabla
• Sitar
Answer: Tabla
Instruments that produce sound from vibrating stretched membranes are called membranophones. The tabla, dholak, and drum are examples.
Q18. We are able to hear the voice of our friend because sound travels through: Science
• Vacuum
• Air
• Earth
• Fire
Answer: Air
Most sounds we hear in daily life, like people talking, travel to our ears through the air, which is a gaseous medium.
Q19. The number of vocal cords in the human larynx is: NCERT
• One
• Two
• Three
• Four
Answer: Two
The human larynx contains two vocal cords. They are folds of tissue that are stretched across the larynx, leaving a slit between them for air to pass.
Q20. When we speak, air comes from the: NCERT
• Heart
• Lungs
• Stomach
• Kidneys
Answer: Lungs
Speech begins when we exhale. Air from the lungs is pushed up through the windpipe towards the larynx.
Q21. The sound from a flute is produced by: NCERT
• Plucking strings
• Striking a membrane
• Blowing air
• Rubbing sticks
Answer: Blowing air
A flute is played by blowing air across a hole. This causes the air column inside the tube to vibrate.
Q22. The correct path of sound in the human ear is: Science
• Pinna → Ear canal → Eardrum
• Eardrum → Pinna → Ear canal
• Ear canal → Pinna → Eardrum
• Cochlea → Pinna → Ear canal
Answer: Pinna → Ear canal → Eardrum
The outer ear (pinna) collects sound and directs it into the ear canal. The sound waves then travel down the canal and strike the eardrum, making it vibrate.
Q23. A sound is produced when something: NCERT
• Moves
• Vibrates
• Stops
• Shines
Answer: Vibrates
Vibration is the rapid back-and-forth motion of an object. This motion disturbs the surrounding medium and creates sound waves.
Q24. The eardrum is located between the: NCERT
• Ear canal and middle ear
• Pinna and ear canal
• Middle ear and inner ear
• Cochlea and auditory nerve
Answer: Ear canal and middle ear
The eardrum forms the boundary between the outer ear (ear canal) and the middle ear. It passes vibrations to the tiny bones in the middle ear.
Q25. Which of these requires a medium to travel? Science
• Light from the sun
• Heat from a fire
• Sound from a bell
• X-rays
Answer: Sound from a bell
Unlike light or heat radiation, sound is a mechanical wave and absolutely needs a medium to propagate.
Q26. A deeper voice (low pitch) is produced when vocal cords are: Science
• Short and vibrate fast
• Long and vibrate slowly
• Loose and thick
• Thin and tight
Answer: Long and vibrate slowly
Frequency determines pitch. Longer vocal cords vibrate with a lower frequency, resulting in a deeper or lower-pitched sound.
Q27. The main vibrating part in a veena is the: NCERT
• Stretched string
• Gourd
• Hollow body
• Frets
Answer: Stretched string
In string instruments like the veena, sitar, or guitar, the primary source of sound is the vibrating string.
Q28. Without the eardrum, a person would not be able to: NCERT
• See
• Smell
• Hear
• Taste
Answer: Hear
The eardrum is essential for hearing. If it is ruptured or damaged, it cannot vibrate properly, leading to hearing loss.
Q29. The ‘slit’ between the vocal cords, through which air passes, is called the: NCERT
• Glottis
• Epiglottis
• Trachea
• Uvula
Answer: Glottis
The opening between the vocal cords is known as the glottis. When the muscles pull the cords tight, the glottis becomes a narrow slit.
Q30. Sound travels fastest in: Science
• Liquids
• Gases
• Solids
• Vacuum
Answer: Solids
The particles in solids are packed most tightly, so they transfer vibrational energy from one particle to the next much faster than in liquids or gases.
Q31. The part of the ear that collects sound from the surroundings is the: NCERT
• Ear canal
• Pinna
• Eardrum
• Cochlea
Answer: Pinna
The pinna is the visible part of the outer ear. Its shape helps to collect sound waves and funnel them into the ear canal.
Q32. A vibrating object produces sound. If it stops vibrating, it will: NCERT
• Produce louder sound
• Produce no sound
• Produce a different pitch
• Echo
Answer: Produce no sound
Sound is the direct result of vibration. The moment an object stops vibrating, it ceases to produce sound energy.
Q33. The high pitch of a female voice is due to: Science
• Longer vocal cords
• Shorter vocal cords
• Larger lungs
• Wider windpipe
Answer: Shorter vocal cords
Shorter vocal cords vibrate at a higher frequency. Since pitch is directly related to frequency, shorter cords produce a higher-pitched voice.
Q34. The air column in a wind instrument vibrates because: NCERT
• It is made of metal
• It is hollow
• It is struck by a hammer
• Air is blown into it
Answer: Air is blown into it
Blowing air into the instrument creates disturbances in the air inside the tube. This causes the air column to vibrate at specific frequencies.
Q35. The lungs help in sound production by: NCERT
• Vibrating directly
• Filtering the air
• Pushing air through the vocal cords
• Absorbing sound
Answer: Pushing air through the vocal cords
The lungs act as the “power supply” or “bellows.” They push a stream of air out, which passes through the vocal cords, causing them to vibrate.
Q36. In which of the following media will sound travel the slowest? Science
• Iron
• Water
• Air
• Wood
Answer: Air
Sound travels slowest in gases like air because the particles are very spread out and take more time to pass on the vibration to their neighbors.
Q37. The eardrum converts sound waves into: NCERT
• Electrical signals
• Light signals
• Vibrations
• Heat
Answer: Vibrations
The function of the eardrum is mechanical. It catches the pressure variations in the air (sound waves) and converts them into mechanical vibrations.
Q38. A musical instrument that produces sound by vibrating strings is a: NCERT
• Dhol
• Flute
• Sitar
• Shehnai
Answer: Sitar
The sitar, like the veena, is a stringed instrument. It has a long neck with strings that are plucked to produce music.
Q39. Children have a high-pitched voice because their vocal cords are: NCERT
• Very long
• Very short and thin
• Very thick
• Very loose
Answer: Very short and thin
Children’s bodies are smaller. Their vocal cords are shorter and thinner than those of adults, leading to a higher frequency of vibration and thus a high pitch.
Q40. The process of hearing begins when the pinna: NCERT
• Vibrates
• Collects sound waves
• Sends signals to the brain
• Amplifies sound
Answer: Collects sound waves
The pinna acts as a funnel. It collects sound waves from the environment and directs them into the ear canal to start the hearing process.
Q41. Astronauts on the moon cannot talk to each other directly because: Science
• Their suits are too thick
• There is no atmosphere (medium) on the moon
• Sound is too slow on the moon
• They are too far apart
Answer: There is no atmosphere (medium) on the moon
The moon has no atmosphere; it is a vacuum. Since sound needs a medium to travel, it cannot travel from one astronaut’s mouth to another’s ears.
Q42. The stretched skin of a drum is its: NCERT
• Resonator
• Vibrating membrane
• Handle
• Stick
Answer: Vibrating membrane
The skin or synthetic head stretched over a drum is the primary source of sound. When struck, this membrane vibrates.
Q43. The larynx gets its name “voice box” because it: NCERT
• Amplifies the sound
• Filters the air we breathe
• Houses the vocal cords
• Connects to the stomach
Answer: Houses the vocal cords
It is called the voice box because it contains the vocal cords, which are the essential structures that vibrate to produce the voice.
Q44. The vibrations from the eardrum are passed to the: NCERT
• Pinna
• Ear canal
• Middle ear bones (hammer, anvil, stirrup)
• Cochlea directly
Answer: Middle ear bones (hammer, anvil, stirrup)
The eardrum is connected to the first of three tiny bones in the middle ear (malleus/hammer). The vibrations are transferred through these bones to the inner ear.
Q45. A vacuum is a space where there is no: Science
• Light
• Matter
• Gravity
• Energy
Answer: Matter
A vacuum is devoid of matter. It contains no particles (atoms or molecules) to vibrate, which is why sound cannot travel through it.
Q46. Which of these is an example of a wind instrument? NCERT
• Tabla
• Sitar
• Flute
• Veena
Answer: Flute
Wind instruments are those that produce sound by blowing air into them. The flute, shehnai, and trumpet are examples.
Q47. Quality Science
• Loudness
• Pitch
Answer: Pitch
Frequency (number of vibrations per second) determines the pitch of a sound. High frequency = high pitch, Low frequency = low pitch.
Q48. To make a sound louder, we need to increase the: Science
• Frequency
• Speed
• Amplitude of vibration
• Pitch
Answer: Amplitude of vibration
Loudness depends on the amplitude (size) of the vibration. Striking a drum harder makes the membrane vibrate with a larger amplitude, producing a louder sound.
Q49. The auditory nerve sends signals from the inner ear to the: NCERT
• Heart
• Brain
• Lungs
• Eardrum
Answer: Brain
The cochlea in the inner ear converts the mechanical vibrations into electrical signals. These signals are then sent by the auditory nerve to the brain, which interprets them as sound.
Q50. A ringing bell is placed inside a jar. If the air is slowly removed from the jar, the sound will: Science
• Become louder
• Remain the same
• Become fainter and then stop
• Turn into an echo
Answer: Become fainter and then stop
As the air (medium) is removed from the jar, there are fewer particles to carry the sound vibrations. The sound will become fainter and finally stop when a vacuum is created.