Sound Class 8 MCQ

Correct Answer: B. When a guitar string is plucked, it moves back and forth rapidly, creating the vibrations that produce sound.

Correct Answer: C. Sound waves need to travel through a medium like air, water, or solids. Space is a vacuum, meaning it lacks these mediums.

Correct Answer: C. Sound cannot travel through a vacuum because there are no particles to carry the vibrations.

Correct Answer: B. Propagation is the term used to describe how sound waves travel through a medium.

Correct Answer: B. When someone knocks on a wooden door, the sound travels through the solid wood to reach your ears.

Correct Answer: A. Sound waves have the ability to pass through various materials, including walls, allowing you to hear sounds from different locations.

Correct Answer: C. A cricket chirping in a field is an example of sound traveling through air, not liquid.

Correct Answer: A. The closer arrangement of particles in solids allows sound vibrations to be transmitted more quickly.

Correct Answer: D. Ultrasound technology utilizes the propagation of sound waves to generate images for medical purposes.

Correct Answer: A. The increased speed and collisions of particles in warmer air facilitate quicker transmission of sound vibrations.

Correct Answer: B. Vibrations are the back-and-forth movements of objects that create sound waves.

Correct Answer: A. Vibrations disturb the particles in a medium, such as air, causing them to bump into each other and propagate the sound wave.

Correct Answer: B. Amplitude refers to how far the object moves from its resting position during vibration, affecting the loudness of the sound.

Correct Answer: A. A larger amplitude means a more intense vibration, leading to a louder sound.

Correct Answer: A. Frequency is the number of vibrations per second. A higher frequency results in a higher-pitched sound.

Correct Answer: B. Time period measures how long it takes for a vibrating object to complete one full cycle of motion.

Correct Answer: C. Hertz (Hz) measures the number of vibrations per second.

Correct Answer: A. A higher frequency produces a higher-pitched sound, while a lower frequency produces a lower-pitched sound.

Correct Answer: C. A bird’s chirp typically has a higher frequency and therefore a higher pitch compared to the other options.

Correct Answer: C. A thunderclap usually has a very low frequency, resulting in a deep, rumbling sound.

Correct Answer: B. The human ear is designed to capture sound waves and convert them into signals that the brain can interpret.

Correct Answer: B. The eardrum vibrates when sound waves reach it, initiating the process of hearing.

Correct Answer: C. The eardrum’s vibrations are passed on to the tiny bones in the middle ear, which then transmit them to the inner ear.

Correct Answer: C. The cochlea contains tiny hair cells that translate vibrations into electrical signals that are sent to the brain.

Correct Answer: B. This range varies slightly from person to person and can decline with age.

Correct Answer: C. Infrasonic sounds are too low for humans to hear but can be detected by some animals.

Correct Answer: A. Ultrasonic sounds are used in various applications, such as medical imaging and animal communication.

Correct Answer: A. Prolonged exposure to loud noises can damage the delicate structures in the inner ear, leading to hearing loss.

Correct Answer: C. The pinna’s shape helps funnel sound waves into the ear canal.

Correct Answer: C. The Eustachian tube helps equalize pressure in the middle ear.

Correct Answer: C. The auditory nerve carries the signals that allow the brain to interpret sounds.

Correct Answer: B. Tinnitus can be a symptom of various underlying conditions, including hearing loss and ear injuries.

Correct Answer: B. Presbycusis is a common condition that affects older adults.

Correct Answer: B. Hearing aids can help people with hearing loss hear sounds more clearly.

Correct Answer: B. Audiograms are used to assess the type and degree of hearing loss.

Correct Answer: C. Loudness and pitch are key characteristics that allow us to differentiate between various sounds.

Correct Answer: C. Amplitude refers to the intensity of the vibration, which directly relates to how loud a sound is.

Correct Answer: C. Decibels (dB) are the units used to express the intensity or loudness of a sound.

Correct Answer: C. A jet engine produces an extremely loud sound, resulting in a very high decibel level.

Correct Answer: C. Frequency, or the number of vibrations per second, determines how high or low a sound’s pitch is.

Correct Answer: B. A baby’s cry typically has a high frequency, resulting in a high-pitched sound.

Correct Answer: B. Birds produce high-pitched sounds with higher frequencies, while lions produce low-pitched roars with lower frequencies.

Correct Answer: B. A shout has a larger amplitude and is therefore louder than a whisper.

Correct Answer: B. Children’s voices usually have higher frequencies and pitches compared to adults.

Correct Answer: B. A drum typically produces a low-pitched sound due to its lower frequency of vibration, while a flute produces a higher-pitched sound.

Correct Answer: B. Music is generally considered to be a pleasant and organized sound.

Correct Answer: A. Noise is often characterized by its irregular and jarring nature.

Correct Answer: D. While excessive noise can be harmful, not all noise is damaging to hearing.

Correct Answer: B. Musical preferences are subjective, and what sounds pleasing to one person may not be pleasing to another.

Correct Answer: D. A loud sound can be enjoyable at a concert but alarming if it’s a sudden, unexpected noise.

Correct Answer: C. The primary distinction lies in the perceived quality of the sound.

Correct Answer: A. A symphony orchestra playing a concert is generally considered a source of music, not noise pollution.

Correct Answer: A. Noise pollution specifically refers to the presence of disruptive or irritating sounds.

Correct Answer: C. Prolonged exposure to loud noises can damage the ears and lead to hearing impairment.

Correct Answer: B. Silencers are designed to muffle the sound of the engine, decreasing noise pollution.

Correct Answer: A. The leaves and branches of trees can help absorb and scatter sound waves, making the environment quieter.

Correct Answer: C. While controlling excessive noise is important, banning all forms of music is not a practical or desirable solution.

Correct Answer: C. Many animals rely on sound for communication and navigation, and excessive noise can interfere with these essential activities.

Correct Answer: B. Very loud noises can cause physical discomfort or even pain in the ears.

Correct Answer: C. Constant exposure to noise can have negative impacts on mental well-being.

Correct Answer: C. Noise ordinances help maintain acceptable noise levels within a community.

Correct Answer: B. Reducing the number of individual vehicles on the road can help decrease traffic noise.

Correct Answer: B. Sound engineering encompasses various techniques to improve the quality or characteristics of sound.

Correct Answer: B. Locating noisy areas away from places that require quiet can help minimize disruptions.

Correct Answer: D. Acoustics is the branch of physics that deals with the study of sound.

Correct Answer: D. The larynx, or voice box, houses the vocal cords, which are essential for sound production.

Correct Answer: C. Vocal cords are located within the larynx and vibrate to produce sound.

Correct Answer: A. When air from the lungs passes over the vocal cords, it causes them to vibrate and generate sound.

Correct Answer: A. Thicker and longer vocal cords tend to vibrate more slowly, producing a lower pitch, while thinner and shorter vocal cords vibrate faster, producing a higher pitch.

Correct Answer: B. The greater length and thickness of men’s vocal cords result in a lower frequency of vibration and a deeper voice.

Correct Answer: C. Children’s vocal cords are smaller and thinner, leading to higher-pitched voices.

Correct Answer: A. Factors like illness, fatigue, or emotional state can influence the tension and vibration of the vocal cords, impacting voice quality.

Correct Answer: C. Laryngitis, often caused by inflammation or infection, can result in temporary voice loss.

Correct Answer: C. Staying hydrated and avoiding vocal strain can help maintain a healthy voice.

Correct Answer: B. Voice therapy can assist individuals in developing healthier vocal habits and addressing specific voice-related issues.

Correct Answer: B. When plucked or strummed, the strings of a guitar vibrate, creating sound waves.

Correct Answer: C. The drumhead vibrates when struck, generating sound waves.

Correct Answer: B. Blowing air across the mouthpiece creates vibrations in the air column within the flute, producing sound.

Correct Answer: D. The player’s lips vibrate against the mouthpiece, creating sound waves that resonate within the trumpet.

Correct Answer: C. Pressing a key causes a hammer to strike a string, making it vibrate and produce sound.

Correct Answer: B. Drawing the bow across the strings causes them to vibrate, generating sound waves.

Correct Answer: C. When struck, the entire cymbal vibrates, producing a crashing sound.

Correct Answer: B. Sound waves are longitudinal waves, meaning the particles vibrate in the same direction the wave travels.

Correct Answer: A. The speed of sound in air can vary slightly depending on temperature and humidity.

Correct Answer: C. Sound travels fastest in solids due to the close proximity of the particles.

Correct Answer: C. Sound reflection is what allows us to hear echoes.

Correct Answer: D. Soft materials like carpets and curtains are good at absorbing sound.

Correct Answer: C. Echoes are created when sound waves bounce off surfaces like walls or cliffs.

Correct Answer: A. The Doppler effect explains why the pitch of a siren changes as it approaches and then moves away from you.

Correct Answer: A. Sonar is used by ships and submarines to navigate and locate objects in the water.

Correct Answer: A. Ultrasound is used in medical imaging to create pictures of internal organs.

Correct Answer: D. Ultrasound has various applications in medicine, including diagnosis and treatment.

Correct Answer: A. Bats and dolphins are examples of animals that use echolocation.

Correct Answer: A. Echolocation allows bats to “see” in the dark by interpreting the echoes of their own sounds.

Correct Answer: C. Sonic booms are created when objects like airplanes break the sound barrier.

Correct Answer: A. Reverberation is often noticeable in large spaces like cathedrals.

Correct Answer: B. The design of a concert hall can significantly impact how sound waves travel and reflect within the space.

Correct Answer: C. Noise cancellation headphones use this technology to block out external sounds.

Correct Answer: D. Sound waves require a medium to propagate, and a vacuum lacks any matter for the waves to travel through.

Correct Answer: B. From microphones and speakers to advanced software and medical imaging, technology plays a crucial role in our interaction with sound.