Short Questions with answers
1. How is sound produced?
Answer : Sound is produced by vibrating objects.
2. What is the voice box in humans called?
Answer : The voice box is called the larynx.
3. Can sound travel in a vacuum?
Answer : No, sound cannot travel in a vacuum.
4. What is the range of audible frequencies for humans?
Answer : The range is 20 Hz to 20,000 Hz.
5. Which part of the ear senses sound vibrations?
Answer : The eardrum senses sound vibrations.
6. What is the unit of frequency?
Answer : The unit is hertz (Hz).
7. What happens to sound when the amplitude of vibration increases?
Answer : The sound becomes louder.
8. What is noise pollution?
Answer : Unwanted or excessive sounds in the environment.
9. How do whales communicate underwater?
Answer : Whales use sound waves to communicate.
10. What does the frequency of sound determine?
Answer : Frequency determines the pitch of sound.
11. Which animal can hear sounds beyond 20,000 Hz?
Answer : Dogs can hear sounds beyond 20,000 Hz.
12. What causes the grains on a stretched rubber to jump when sound is produced?
Answer : Vibrations cause the grains to jump.
13. What are pleasant sounds called?
Answer : Pleasant sounds are called music.
14. Name a common source of noise pollution at home.
Answer : Television at high volume.
15. What is the function of the vocal cords?
Answer : They produce sound by vibrating.
16. Why does a drum produce a low-pitched sound?
Answer : Because it vibrates with a low frequency.
17. Which musical instrument vibrates its stretched strings to produce sound?
Answer : A sitar vibrates its strings.
18. What is the amplitude of vibration?
Answer : It is the maximum displacement of a vibrating object.
19. What happens if the eardrum is damaged?
Answer : It may cause hearing impairment.
20. What is the difference between noise and music?
Answer : Noise is unpleasant, while music is pleasant.
Medium Questions with answers
1. How is sound produced in humans?
Answer : In humans, sound is produced by the vibration of vocal cords located in the larynx. Air forced through the slit between the cords causes them to vibrate, creating sound.
2. Why can’t sound travel through a vacuum?
Answer : Sound requires a medium like air, water, or solids to propagate. In a vacuum, there are no particles to transfer the sound vibrations.
3. What is the difference between loudness and pitch of a sound?
Answer : Loudness depends on the amplitude of vibration, whereas pitch is determined by the frequency. Larger amplitude makes sound louder, and higher frequency makes it shriller.
4. How does the eardrum help us hear sound?
Answer : The eardrum vibrates when sound waves hit it and transfers these vibrations to the inner ear. The inner ear sends signals to the brain to interpret the sound.
5. What are the effects of noise pollution on health?
Answer : Noise pollution can cause stress, lack of sleep, hearing problems, and high blood pressure. Prolonged exposure to loud sounds may lead to permanent hearing damage.
6. What determines the frequency of a vibrating object?
Answer : The frequency depends on how many vibrations the object completes in one second. Higher vibrations mean higher frequency and a shriller sound.
7. What happens when a drum is struck harder?
Answer : Striking a drum harder increases the amplitude of vibrations, producing a louder sound. The pitch remains unaffected.
8. How do musical instruments produce sound?
Answer : Musical instruments produce sound by vibrating parts like strings, membranes, or air columns. These vibrations create sound waves.
9. What is the role of trees in reducing noise pollution?
Answer : Trees absorb sound waves and act as natural barriers. Planting trees along roads and buildings reduces the effects of noise pollution.
10. Why do men, women, and children have different voices?
Answer : The length and thickness of vocal cords vary in men, women, and children. Men have longer and thicker cords, producing lower-pitched sounds.
Long Questions with answers
1. How do vibrating objects produce sound?
Answer : Vibrating objects create sound by causing the surrounding medium (air, water, or solids) to vibrate. These vibrations generate sound waves that travel in all directions. When these waves reach our ears, they are interpreted as sound.
2. Explain how sound travels through solids, liquids, and gases.
Answer : Sound waves move through solids, liquids, and gases by vibrating particles in the medium. Solids transmit sound the fastest due to tightly packed particles, while gases transmit it the slowest. Without a medium, like in a vacuum, sound cannot travel.
3. What are the harmful effects of noise pollution?
Answer : Noise pollution can cause hearing loss, stress, high blood pressure, and sleep disturbances. Continuous exposure to loud sounds may result in temporary or permanent hearing damage. It also affects mental health and overall well-being.
4. How does the human ear process sound?
Answer : Sound waves enter the ear and make the eardrum vibrate, transferring these vibrations to the inner ear. The inner ear converts the vibrations into electrical signals, which are sent to the brain. The brain interprets these signals as specific sounds.
5. How do amplitude and frequency affect sound?
Answer : Amplitude determines the loudness of a sound; greater amplitude means louder sound. Frequency affects the pitch; higher frequency creates a shriller sound, and lower frequency creates a deeper sound. Together, they define the sound’s character.
6. Why is the larynx important for speech?
Answer : The larynx contains vocal cords that vibrate when air passes through them, producing sound. The tension and length of the cords change to create different pitches. It allows humans to speak, sing, and produce various sounds.
7. How can we reduce noise pollution in residential areas?
Answer : Noise pollution can be reduced by planting trees, using silencers on vehicles, and maintaining lower volumes in homes. Industries and construction sites should be located far from residential areas. Public awareness and rules can help minimize noise pollution.
8. Why do we see lightning before hearing thunder?
Answer : Light travels much faster than sound, at a speed of 300,000 km/s compared to sound’s 343 m/s in air. Thus, the flash of lightning reaches us before the sound of thunder. This difference is due to the varying speeds of light and sound.
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