Class 8 Science Chapter 10 Sound Question and Answer - FREE PDF Download
FAQs on NCERT Solutions for Class 8 Science Chapter 10 Sound
1. What is the main concept covered in NCERT Solutions for Class 8 Science Chapter 10 Sound?
NCERT Solutions for Class 8 Science Chapter 10 Sound mainly focus on understanding how sound is produced, transmitted, and received. The chapter explains the concepts of vibration, characteristics of sound waves (like frequency, amplitude, wavelength), production of sound in humans and instruments, and the effects of noise pollution, following the CBSE 2025–26 syllabus.
2. How is sound produced according to NCERT Class 8 Science Chapter 10?
According to NCERT Class 8 Science Chapter 10 Sound, sound is produced when a body vibrates. These vibrations cause the surrounding medium (solid, liquid, or gas) to move in compressions and rarefactions, creating sound waves that travel to our ears.
3. Why can sound not travel through a vacuum?
Sound cannot travel through a vacuum because there are no molecules or particles to transmit the vibrations. Sound requires a medium (such as air, water, or solids) for transmission, as explained in the NCERT Solutions for Class 8 Science Chapter 10 Sound.
4. What is the role of the larynx (voice box) in sound production in humans?
The larynx, or voice box, contains vocal cords that vibrate when air from the lungs passes through them. These vibrations produce sound, which is then modified by the mouth, tongue, and lips to form speech.
5. How does frequency affect the pitch of sound as per CBSE guidelines?
The frequency of a sound wave determines its pitch. A higher frequency produces a higher pitch, and a lower frequency produces a lower pitch. For example, the voice of a man has a lower frequency and hence a lower pitch compared to that of a baby, as stated in the NCERT Solutions for Class 8 Science Chapter 10.
6. What is noise pollution, and what are its adverse effects according to the NCERT Solutions Class 8 Science Sound chapter?
Noise pollution is the presence of unwanted or harmful sounds in the environment. Its adverse effects include:
- Hearing impairment
- Stress and irritability
- Sleep disturbances (insomnia)
- Increased blood pressure
- Reduced concentration and productivity
7. What are the key differences between noise and music as outlined in Class 8 NCERT Solutions?
Music is a pleasant, harmonic sound produced by regular vibrations, while noise is an unpleasant, irregular sound due to erratic vibrations. At high volumes, even music can become noise and cause discomfort.
8. What is the audible range of human hearing according to Chapter 10 of Class 8 Science?
The audible range for humans is from 20 Hz to 20,000 Hz. Sounds outside this range are called infrasonic (below 20 Hz) or ultrasonic (above 20,000 Hz), as described in the NCERT Solutions for Sound Class 8.
9. How do musical instruments produce sound based on NCERT Solutions for Class 8 Science Chapter 10?
Different musical instruments produce sound through vibrating parts:
- Membranes (e.g., drums like dholak)
- Strings (e.g., sitar)
- Air columns (e.g., flute)
10. What is meant by amplitude and how does it affect sound as per Class 8 Science NCERT Solutions?
Amplitude is the height of the sound wave from its mean position. A larger amplitude means louder sound, while a smaller amplitude means softer or feeble sound.
11. If the frequency of a sound increases, what happens to its pitch and why?
When the frequency increases, the pitch of the sound also increases. This happens because pitch is directly proportional to frequency, as explained in the CBSE Class 8 Science curriculum for 2025–26.
12. What measures can be taken to reduce noise pollution as suggested in NCERT Solutions for Sound Chapter Class 8?
To reduce noise pollution, one should:
- Limit the use of loudspeakers and firecrackers
- Maintain vehicles and machine parts
- Use soundproofing materials in buildings
- Plant trees along roads and around homes
- Keep television and audio device volume low
13. What would happen if sound could travel through a vacuum, and how does this relate to real-life scenarios?
If sound could travel through a vacuum, we would be able to hear sounds in space. However, in real life, astronauts use radios because sound requires a medium to travel, which is absent in the vacuum of space, as discussed in Class 8 Science NCERT Solutions.
14. How does the human ear detect and interpret sound according to Chapter 10 Sound NCERT Solutions?
The human ear detects sound by:
- Outer ear collects sound waves
- Middle ear amplifies vibrations
- Inner ear converts vibrations into electrical impulses
- Brain interprets these impulses as sound
15. Why is it important to prepare from NCERT Solutions for Class 8 Science Chapter 10 for CBSE exams?
NCERT Solutions for Class 8 Science Chapter 10 strictly follow the latest CBSE exam pattern and syllabus. They provide accurate, stepwise explanations for all textbook questions, helping students develop a strong conceptual foundation and score higher in their 2025–26 board assessments.











