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# Solutions 13. Sound - Text Book Exercise | Class 8 Science - Toppers Study

Topper Study classes prepares ncert solutions on practical base problems and comes out with the best result that helps the students and teachers as well as tutors and so many ecademic coaching classes that they need in practical life. Our ncert solutions for Solutions 13. Sound - Text Book Exercise | Class 8 Science - Toppers Study is the best material for English Medium students cbse board and other state boards students.

## Solutions 13. Sound - Text Book Exercise | Class 8 Science - Toppers Study

CBSE board students who preparing for class 8 ncert solutions maths and Science solved exercise chapter 13. Sound available and this helps in upcoming exams 2023-2024.

### You can Find Science solution Class 8 Chapter 13. Sound

• All Chapter review quick revision notes for chapter 13. Sound Class 8
• NCERT Solutions And Textual questions Answers Class 8 Science
• Extra NCERT Book questions Answers Class 8 Science
• Importatnt key points with additional Assignment and questions bank solved.

Chapter 13 Science class 8

### Text Book Exercise class 8 Science Chapter 13. Sound

• Solutions 13. Sound - Text Book Exercise | Class 8 Science - Toppers Study
• Class 8 Ncert Solutions
• Solution Chapter 13. Sound Class 8
• Solutions Class 8
• Chapter 13. Sound Text Book Exercise Class 8

## Exercise

1. Choose the correct answer :

Sound can travel through

(a) gases only

(b) solids only

(c) liquids only

(d) solids, liquids and air

(d) solids, liquids and air

2. Which of the following voices is likely to have minimum frequency?

(a) Baby girl

(b) Baby boy

(c) A man

(d) A woman

(c) A man

3. In the following statements, tick T against those which are true, and F against those which are false:

(a) Sound cannot travel in vacuum. (T/F)

(b) The number of oscillations per second of a vibrating object is called its time period. (T/F)

(c) If the amplitude of vibration is large, sound is feeble. (T/F)

(d) For human ears, the audible range is 20 Hz to 20,000 Hz. (T/F)

(e) The lower the frequency of vibration, the higher is the pitch. (T/F)

(f) Unwanted or unpleasant sound is termed as music. (T/F)

(g) Noise pollution may cause partial hearing impairment. (T/F)

(a) T  (b) F  (c) F  (d) T  (e) F  (f) F  (g) T.

4. Fill in the blanks with suitable words.

(a) Time taken by an object to complete one oscillation is called ................... .

(b) Loudness is determined by the .........................of vibration.

(c) The unit of frequency is..........................

(d) Unwanted sound is called ......................... .

(e) Shrillness of a sound is determined by the ................. of vibration.

(a) Time period  (b) amplitude  (c) hertaz  (d) noise  (e) frequency.

5. A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.

6. The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration?

7. Identify the part which vibrates to produce sound in the following instruments:

(a) Dholak

(b) Sitar

(c) Flute

 Instrument Part which vibrates to produse sound (a) Dholak Strechted membrane (b)Sitar Strechted string (c) Flute Air column

8. What is the difference between noise and music? Can music become noise sometimes?

The unpleasant sound is called noise, wherease pleasant sound is called music. Noise can produce so many health hazard, whereas music brings about soothing affect.

Yes, music become noise when musical instrument produce high volume sound.

9. List sources of noise pollution in your surroundings.

The sound of bus, truck, construction, T.V., radio and loudspeaker etc.

10. Explain in what way noise pollution is harmful to humans.

(i) Lack of sleep, hypertention, anxiety etc are some of the problems that may be caused due to noise pollution

(ii) A person who is exposed to a loud sound continously, may get temporary or even permanent deafness.