The speed of sound is $310 ms^{-1}$. A person fires a gun. An echo is heard after 1.5 s . Calculate the distance of the person from the cliff from which the echo is heard.
View full solution →Question types
Sound question types
56 questions across 6 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
56
Questions
6
Question groups
5
Question types
01
[1 Mark Question Answer]
4 Q→02[2 Mark Question Answer]
17 Q→03[3 Mark Question Answer]
2 Q→04[5 Mark Question Answer]
3 Q→05MCQ
25 Q→06fill in the blanks.
5 Q→Sample Questions
Sound questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
(a) What determines pitch of sound?
(b) (i) Name one factor which affects the frequency of sound emitted due to vibrations in an air column.
(ii) Name the unit used for measuring the sound level.
(b) (i) Name one factor which affects the frequency of sound emitted due to vibrations in an air column.
(ii) Name the unit used for measuring the sound level.
What are reverberation? Give two examples.
State the laws of reflection of sound.
(a) Give one example of natural vibrations.
(b) What are forced vibrations? Give one example.
(b) What are forced vibrations? Give one example.
(a) Name the subjective property of sound related to its frequency.
(b) Why does the quality of sound of same pitch differ, when emitted by different instruments?
(b) Why does the quality of sound of same pitch differ, when emitted by different instruments?
(a) A person walking past a railway line at the middle of night hears a ringing sound along with the sound of his footsteps. Why?
(b) What change do you expect in the characteristics of a musical note when the following are increased :
(i) amplitude, (ii) frequency?
(b) What change do you expect in the characteristics of a musical note when the following are increased :
(i) amplitude, (ii) frequency?
(a) Name the unit used for measuring the sound level.
(b) A vibrating tuning fork is held at a certain fixed length of an air column when a loud sound is heard. What phenomenon is responsible for it? How does the phenomenon occur?
(b) A vibrating tuning fork is held at a certain fixed length of an air column when a loud sound is heard. What phenomenon is responsible for it? How does the phenomenon occur?
(a) Name the characteristic of sound which enables one to distinguish the sound of two musical instruments even if they are of same pitch and same loudness.
(b) Two waves of same pitch have their amplitudes in the ratio $2: 3$.
(i) What will be the ratio of their loudness?
(ii) What will be the ratio of their frequencies?
View full solution →(b) Two waves of same pitch have their amplitudes in the ratio $2: 3$.
(i) What will be the ratio of their loudness?
(ii) What will be the ratio of their frequencies?
(i) (a) What is an echo?
(b) State two conditions necessary for the formation of an echo.
(ii) What is sonar? State its principle. How is it used to find the depth of sea?
(iii) How do the following use echoes?
(a) army, (b) geologist, (c) medical sciences
(b) State two conditions necessary for the formation of an echo.
(ii) What is sonar? State its principle. How is it used to find the depth of sea?
(iii) How do the following use echoes?
(a) army, (b) geologist, (c) medical sciences
(i) (a) A person is tuning his radio set to a particular station. What is the person trying to do to tune it?
(b) Name the phenomenon involved, in tuning the radio set.
(c) Define the phenomenon named by you in part (b).
(ii) (a) A wire of length 80 cm has a frequency of 256 Hz . Calculate the length of a similar wire under similar tension, which will have frequency 1024 Hz ,
(b) A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m .
(i) Calculate the speed with which this sound travels.
(ii) What difference would be felt by a listener between the above sound and another sound traveling at the same speed, but of wavelength 2.6 m ?
(iii) Name the factor that determines: (a) Loudness of the sound heard. (b) Quality of the note. (c) Pitch of the note.
(b) Name the phenomenon involved, in tuning the radio set.
(c) Define the phenomenon named by you in part (b).
(ii) (a) A wire of length 80 cm has a frequency of 256 Hz . Calculate the length of a similar wire under similar tension, which will have frequency 1024 Hz ,
(b) A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m .
(i) Calculate the speed with which this sound travels.
(ii) What difference would be felt by a listener between the above sound and another sound traveling at the same speed, but of wavelength 2.6 m ?
(iii) Name the factor that determines: (a) Loudness of the sound heard. (b) Quality of the note. (c) Pitch of the note.
(i) How free vibration is different from damped vibration?
(ii) An enemy plane is at a distance of 300 km from a radar. In how much time the radar will be able to detect the plane? Take velocity of radio waves as $3 \times 10^5 kms ^{-1}$.
(iii) (a) (i) Draw a graph between displacement and the time for a body executing free vibrations.
(ii) Where can a body execute free vibrations?
(b) (i) State the safe limit of sound level in terms of decibel for human hearing.
(ii) Name the characteristic of sound in relation to its waveform.
View full solution →(ii) An enemy plane is at a distance of 300 km from a radar. In how much time the radar will be able to detect the plane? Take velocity of radio waves as $3 \times 10^5 kms ^{-1}$.
(iii) (a) (i) Draw a graph between displacement and the time for a body executing free vibrations.
(ii) Where can a body execute free vibrations?
(b) (i) State the safe limit of sound level in terms of decibel for human hearing.
(ii) Name the characteristic of sound in relation to its waveform.
Assertion (A): Frequency is a measurable quantity. It depends on the source producing sound.
Reason (A): Pitch depends on the sensation as perceived by a listener.
Reason (A): Pitch depends on the sensation as perceived by a listener.
- ABoth A and R are true and R is the correct explanation of A
- ✓Both A and R are true but R. is not the correct explanation of A
- CAssertion is false but reason is true.
- DAssertion is true but reason is false.
Answer: B.
View full solution →Assertion (A): Strings of different thicknesses are provided on a stringed instrument.
Reason (A): Notes of different frequences can be obtained by producing vibrations in different strings having different thicknesses.
Reason (A): Notes of different frequences can be obtained by producing vibrations in different strings having different thicknesses.
- ✓Both A and R are true and R is the correct explanation of A
- BBoth A and R are true but R. is not the correct explanation of A
- CAssertion is false but reason is true.
- DAssertion is true but reason is false.
Answer: A.
View full solution →In natural vibrations, the vibrations are only under the:
- Adamping force
- Bfrictional force
- Crestoring force
- ✓external periodic force
Answer: D.
View full solution →Resonance is a special case of:
- Anatural vibrations
- Bfree vibrations
- Cdamped vibrations
- ✓forced vibrations
Answer: D.
View full solution →If the frequency of the external force is much different from the natural frequency of the body, the amplitude of oscillations is:
- Avery large
- Blarge
- ✓very small
- Dany of these
Answer: C.
View full solution →The voice of a ___________ [man/woman] is usually of a higher pitch than that of a ___________ [man / woman].
The ___________ [amplitude / wavelength / frequency] determines the pitch of a sound wave.
A wire stretched between two fixed supports is placked exactly in the middle and then relesed. It executes ___________ [forced / damped / natural] vibrations.
The minimum distance between the source and the reflector in air, to hear an echo, is approximately ___________ $[12 m / 17 m / 20 m]$
View full solution →The sound heard after reflection from a distant obstacle after the original sound has ceased, is called a/an ___________ [ultrasound / echo / reverberation].
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