Class 10th Physics Unit 11 Sound MCQs Short Long Notes

physics 10th notes ch 11

1. Sound waves are:

 
 
 
 

2. Which is the characteristic of sound distinguish between a shrill and a grave sound?

 
 
 
 

3. Intensity of loudest audible sound is:

 
 
 
 

4. Sound is produced by:

 
 
 
 

5. Intensity level of train siren is:

 
 
 
 

6. The loudness of sound is directly proportional to logarithm of intensity, this Law is called:

 
 
 
 

7. Voice of women and children as compare to men is:

 
 
 
 

8. The unit of intensity of sound is:

 
 
 
 

9. Pitch of sound depends on:

 
 
 
 

10. Loudness of sound depends on:

 
 
 
 

11. The amplitude of 100 dB sound is:

 
 
 
 

12. The study of sound is called:

 
 
 
 

13. Which of these waves consist of compressions and rarefactions?

 
 
 
 

14. Characteristic by which We can distinguish between two sounds of same loudness and pitch is called:

 
 
 
 

15. Intensity of whispering:

 
 
 
 

16. Intensity is a quantity:

 
 
 
 

17. Intensity of faintest sound is:

 
 
 
 

18. Which is an example of longitudinal waves?

 
 
 
 

19. The intensity of sound depends on:

 
 
 
 

20. Sound is a form of energy: 

 
 
 
 

21. Intensity of rustling of leaves is: 

 
 
 
 

22. Sound can travel only in presence of:

 
 
 
 

23. I bell is equal to: 

 
 
 
 

24. Frequency of silent whistle lies between:

 
 
 
 

25. The distance between two consecutive compressions and rarefactions is called:

 
 
 
 

Short Questions

Define intensity level or sound intensity level.
Define intensity of sound? Also write the intensity of faintest and loudest sound.
Define loudness of sound and what are the factors which affect it?
Define pitch of the sound. On which factors does it depend?
Define SI unit of sound level (Bel).
Define the quality of sound. Upon which factors it depends?
Define the wavelength of sound wave. OR How will you Define wavelength in the case of longitudinal waves (sound waves)?
Describe the importance of acoustic protection.
Describe the effect of change in amplitude on loudness and the effect of change in frequency on pitch of sound.
Draw the waveforms of sound produced by the following instruments:
Tuning fork ·Flute·Clarinet
Explain that noise is a nuisance.
Explain how sound is produced by a school bell?
Find sound level of sound of train (in bel and dB scale). If Intensity of sound of train is 10⁻²Wm⁻² and intensity of faintest sound is 10−12Wm⁻².
Frequency of tuning fork depends on which factors?
How can you prove the mechanical nature of sound by a simple experiment?
How sound waves are produced?
How stethoscope works?
Identify which part of these musical instruments vibrates to produce sound.
· Electric bell · Loud speaker· Piano· Violin· Flute
If the pitch of sound is increased, what are the changes in the following?
a. the frequency b. the wavelength
c. the wave velocity d. the amplitude of the wave
If we clap or speak in front of a building while standing at a particular distance, we rehear our sound after sometime. Can you explain how does this happen?
If we dip a vibrating tuning fork into a glass of water, we will see a splash. What does make the water splash?
On what factors do the frequency of tuning fork depend?
On what factors does the loudness of sound depend?
Sound is a form of wave. List at least three reasons to support the idea that sound is a wave.
Suppose you and your friend are on Moon. Will you be able to hear any sound produced by your friend?
We know that waves manifest phenomenon of reflection, refraction and diffraction. Does sound also manifest these characteristics?
What do you understand by the longitudinal wave? Describe the longitudinal nature of sound waves.
What is difference between frequency and pitch? Describe their relationship graphically.
What are the uses of ultrasound in medicine?
What are the units of loudness? Why do we use logarithmic scale to describe the range of the sound intensities we hear?
What do you know about resonance?
What do you know about silent whistle?
What do you know about stethoscope?
What do you know about the production and propagation of sound waves? What is the necessary condition for the production and propagation of sound?
What do you mean by the term intensity level of the sound? Name and Define the unit of intensity level of sound.
What is sound?
What is the audible frequency range for human ear? Does this range vary with the age of people? Explain.
What is the difference between the frequency and pitch?
What is the difference between the loudness and intensity of sound? Derive the relationship between the two.
What is the effect of the medium on the speed of sound? In which medium sound travels more faster: air, solid or liquid? Justify your answer .
What is tuning fork?
What would happen to the loudness of sound with increase in its frequency?
Which property of sound wave determines its: (a) loudness (b) pitch?
Why are sound waves called, the mechanical waves?
Why medium is To Find for propagation of sound.
Why voice of women is more shrill than that of men?
With the help of wave form illustrate the longitudinal nature of sound waves formed by the vibrating tuning fork. Also Define the compressions and rarefactions.
Write down the relation between loudness and intensity of a sound. 

Long Questions

A ship sends out ultrasound that returns from the seabed and is detected after 3.42 s. If the speed of ultrasound through seawater is 1531 m s⁻¹, what is the distance of the seabed from the ship?
A doctor counts 72 heartbeats in 1 min. Calculate the frequency and period of the heartbeats.
A marine survey ship sends a sound wave straight to the seabed. It receives an echo 1.5 s later . The speed of sound in seawater is 1500 m s⁻¹ . Find the depth of the sea at this position.
A normal conversation involves sound intensities of about 3.0 × 10⁻⁶ W m⁻² . What is the decibel level for this intensity? What is the intensity of the sound for 100 dB?
A student clapped his hands near a cliff and heard the echo after 5 s. What is the distance of the cliff from the student if the speed of the sound is taken as 346 m s⁻¹ ?
At a particular temperature, the speed of sound in air is 330 m s⁻¹ . If the wavelength of a note is 5 cm, calculate the frequency of the sound wave. Is this frequency in the audible range of the human ear?
Describe the importance of acoustic protection?
How can you find the speed of sound by echo method? What factors can effect the accuracy of this method?
If at Anarkali Bazar Lahore, intensity level of sound is 80 dB, what will be the intensity of sound there?
The highest frequency sound humans can hear is about 20,000 Hz. What is the wavelength of sound in air at this frequency at a temperature of 20 C? What is the wavelength of the lowest sounds we can hear of about 20 Hz? Assume the speed of sound in air at 20 C is 343 m s⁻¹ .
What are sound waves? What is necessary condition for the production of sound?
What do you mean by the term intensity level of the sound? Name and Define the unit of intensity level of sound?
What is noise pollution? Explain that noise is a nuisance?
What is reflection of sound? Give example
What is the audible frequency range? What are the uses of ultrasound in medicine?
What is the effect of the medium on the speed of sound?
Write a note on the characteristics of sound?
Write about the longitudinal nature of sound waves?

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