Sound – Very Short Answer Type Questions

CBSE Class 8 Science – Chapter 13: Sound | Very Short Answer Type Questions with Answers

CBSE Class 8 Science – Chapter Wise Study Materials Based on NCERT

Chapter 13: Sound – Very Short Answer Type Questions with Answers

Class: 8

Subject: Science

Chapter: 13 – Sound

Board: CBSE

Suitable for: Annual Examination • Periodic Tests • Class Tests • Pre-Board / School Level Board Exam Pattern

These Very Short Answer Type Questions with Answers are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 8 board exams standard.

This page provides a topic-wise set of 50 Very Short Answer Type Questions from Chapter 13: Sound, with clear, exam-focused answers to help students revise quickly as per NCERT Class 8 Science.

Very Short Answer Type Questions – Chapter 13: Sound

A. Basics of Sound and Vibrations

Q1.What is sound?

Ans. Sound is a form of energy that produces the sensation of hearing in our ears.

Q2.How is sound produced?

Ans. Sound is produced when an object vibrates.

Q3.What do you mean by vibration?

Ans. Vibration is the to-and-fro or back-and-forth motion of an object about its mean position.

Q4.Give one example showing that vibrating objects produce sound.

Ans. When we pluck a guitar string, it vibrates and produces sound.

Q5.What happens to sound when vibrations stop?

Ans. When vibrations stop, the sound produced also stops.

Q6.Which part of the human body vibrates to produce sound?

Ans. The vocal cords in the voice box vibrate to produce sound.

Q7.Name the box in our body that contains the vocal cords.

Ans. The vocal cords are present in the voice box or larynx.

Q8.How does the school bell produce sound?

Ans. When the bell is struck, its metal body vibrates and produces sound.

B. Propagation of Sound and Medium

Q9.What is meant by propagation of sound?

Ans. Propagation of sound is the way sound travels from the source to the listener.

Q10.Does sound need a material medium to travel?

Ans. Yes, sound needs a material medium like air, water or solids to travel.

Q11.Can sound travel through vacuum?

Ans. No, sound cannot travel through vacuum because there are no particles to carry the vibrations.

Q12.Name any two media through which sound can travel.

Ans. Sound can travel through air and water (also through solids).

Q13.In which medium does sound generally travel fastest – solid, liquid or gas?

Ans. Sound generally travels fastest in solids.

Q14.What is the usual medium for sound to reach our ears?

Ans. The usual medium is air.

C. Characteristics of Sound – Amplitude, Frequency, Time Period

Q15.What is amplitude of vibration?

Ans. Amplitude is the maximum displacement of a vibrating particle from its mean position.

Q16.How is loudness of sound related to amplitude?

Ans. Loudness is directly proportional to the amplitude; larger amplitude means louder sound.

Q17.Define frequency.

Ans. Frequency is the number of complete vibrations made in one second.

Q18.Name the unit of frequency.

Ans. The unit of frequency is hertz (Hz).

Q19.Define time period of a vibration.

Ans. Time period is the time taken to complete one full vibration.

Q20.What is the relation between time period and frequency?

Ans. Frequency = 1 / Time period, and Time period = 1 / Frequency.

Q21.What is pitch of a sound?

Ans. Pitch is the characteristic that tells us whether a sound is shrill or deep.

Q22.On which factor does pitch depend?

Ans. Pitch depends on the frequency of vibration.

Q23.Which has a higher pitch – a child’s voice or an adult man’s voice?

Ans. A child’s voice generally has a higher pitch than an adult man’s voice.

Q24.Which has larger amplitude – a loud sound or a soft sound?

Ans. A loud sound has larger amplitude than a soft sound.

D. Audible Range and Special Types of Sounds

Q25.What is the audible range of sound for a normal human ear?

Ans. The audible range for a normal human ear is from about 20 Hz to 20,000 Hz.

Q26.What are infrasonic sounds?

Ans. Sounds with frequency less than 20 Hz are called infrasonic sounds.

Q27.What are ultrasonic sounds?

Ans. Sounds with frequency more than 20,000 Hz are called ultrasonic sounds.

Q28.Can humans hear ultrasonic sounds?

Ans. No, humans cannot hear ultrasonic sounds.

Q29.Name any one animal that can hear ultrasonic sound.

Ans. Bats can hear ultrasonic sound (also dogs and dolphins).

E. Music, Noise and Noise Pollution

Q30.What is music?

Ans. Music is a sound that is pleasant to hear and has a regular pattern.

Q31.What is noise?

Ans. Noise is an unpleasant and unwanted sound that causes discomfort.

Q32.Give one example of noise from daily life.

Ans. Continuous honking of vehicles on a busy road is an example of noise.

Q33.Give one example of musical sound.

Ans. Sound produced by a properly tuned flute is a musical sound.

Q34.What is noise pollution?

Ans. Noise pollution is the presence of excessive or unwanted sound in the environment that causes discomfort.

Q35.State one major cause of noise pollution in cities.

Ans. Heavy traffic and continuous honking on roads is a major cause of noise pollution in cities.

Q36.Mention one harmful effect of noise pollution.

Ans. Noise pollution can cause headache and lack of concentration.

Q37.How can we reduce noise at home?

Ans. We can reduce noise by keeping the volume of TV and music systems low.

Q38.How do trees help in controlling noise pollution?

Ans. Trees absorb sound and thus help in reducing noise pollution.

F. Human Ear – Structure and Hearing

Q39.Name the three main parts of the human ear.

Ans. The three main parts are outer ear, middle ear and inner ear.

Q40.What is the function of the pinna?

Ans. Pinna collects sound waves and sends them into the ear canal.

Q41.Name the thin membrane present at the end of the ear canal.

Ans. The thin membrane is called the eardrum or tympanum.

Q42.What happens when sound waves strike the eardrum?

Ans. When sound waves strike the eardrum, it starts vibrating.

Q43.Name the three small bones present in the middle ear.

Ans. The three small bones are hammer, anvil and stirrup.

Q44.What is the function of the small bones in the middle ear?

Ans. They increase (amplify) the vibrations received from the eardrum.

Q45.Name the part of the ear where vibrations are converted into electrical signals.

Ans. Vibrations are converted into electrical signals in the cochlea of the inner ear.

Q46.Which nerve carries sound signals to the brain?

Ans. The auditory nerve carries sound signals to the brain.

G. Ear Care and Everyday Applications

Q47.Why should we avoid listening to very loud music using earphones?

Ans. Very loud music can damage our ears and may cause hearing loss.

Q48.Why should we not insert sharp objects into our ears?

Ans. Sharp objects can injure the ear canal or eardrum and cause serious damage.

Q49.Mention one step schools can take to reduce noise pollution.

Ans. Schools can declare silence zones and restrict use of loudspeakers near classrooms.

Q50.How does controlling noise help students?

Ans. Controlling noise helps students to concentrate better and study peacefully.

These 50 Very Short Answer Type Questions and Answers on Chapter 13: Sound strictly follow the NCERT Class 8 Science syllabus and CBSE pattern, making them perfect for quick revision before exams, class tests and school-level board exam standards.