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All questions of Sound Wave for UPSC CSE Exam
What is the speed of sound in air?- a)330 m/s
- b)332 m/s
- c)334 m/s
- d)336 m/s
Correct answer is option 'B'. Can you explain this answer?
What is the speed of sound in air?
a)
330 m/s
b)
332 m/s
c)
334 m/s
d)
336 m/s
|
Santosh Kumar Singh answered |
Speed of Sound in air at 0 degree Celsius is noted to be approximately 331.5 m/s which is rounded off to 332 m/s.
What type of waves are Sound Waves?- a)Latitudinal waves
- b)Longitudinal waves
- c)Latitudinal mechanical waves
- d)None of the above
Correct answer is option 'B'. Can you explain this answer?
What type of waves are Sound Waves?
a)
Latitudinal waves
b)
Longitudinal waves
c)
Latitudinal mechanical waves
d)
None of the above
|
Paradigm Institute answered |
Sound waves are classified as longitudinal waves because they involve the oscillation of particles in the same direction as the wave propagates. In other words, the particles vibrate back and forth parallel to the direction of energy transfer. This is in contrast to transverse waves, where particles oscillate perpendicular to the direction of wave propagation.
In a sound wave, variations in pressure and density create areas of compression and rarefaction as the wave travels through a medium, such as air, water, or solids. The compression regions correspond to areas of higher pressure and density, while the rarefaction regions correspond to areas of lower pressure and density. The particles within the medium oscillate back and forth as the wave passes through, transmitting the energy of the sound.
This longitudinal motion of particles is responsible for the characteristic behavior of sound waves, such as the ability to propagate through different materials and the phenomenon of interference and resonance. It allows sound to travel through gases, liquids, and solids, albeit at different speeds depending on the medium.
What will be the effect of temperature on speed of sound?- a)The speed of sound decreases with the increases of temperature of the medium.
- b)The speed of sound decreases with the decrease of temperature of the medium.
- c)The speed of sound increases with the decrease of temperature of the medium.
- d)The speed of sound increases with the increase of temperature of the medium.
Correct answer is option 'D'. Can you explain this answer?
What will be the effect of temperature on speed of sound?
a)
The speed of sound decreases with the increases of temperature of the medium.
b)
The speed of sound decreases with the decrease of temperature of the medium.
c)
The speed of sound increases with the decrease of temperature of the medium.
d)
The speed of sound increases with the increase of temperature of the medium.
|
Catalyst Learningacademy answered |
The speed of sound increases with the increase of temperature of the medium. The speed of sound in air increases by 0.61 m/s when the temperature is increased by10C.
What is the unit of loudness?- a)Bel
- b)Phon
- c)Decibel
- d)All of the above
Correct answer is option 'D'. Can you explain this answer?
What is the unit of loudness?
a)
Bel
b)
Phon
c)
Decibel
d)
All of the above
|
|
Paradigm Institute answered |
The sensation of a sound perceived in a ear is measured by another term called loudness which depends on intensity of sound and sensitiveness of the ear. Unit of loudness is bel. A practical unit of loudness is decibel (dB) which is 1/10th of bel. Another unit of loudness is phon.
When a motor boat in a sea travels faster than sound, then waves just like shock-waves are produced on the surface of water. These waves are called ________.- a)Shock waves
- b)Doppler’s waves
- c)Refracted waves
- d)Bow waves
Correct answer is option 'D'. Can you explain this answer?
When a motor boat in a sea travels faster than sound, then waves just like shock-waves are produced on the surface of water. These waves are called ________.
a)
Shock waves
b)
Doppler’s waves
c)
Refracted waves
d)
Bow waves
|
|
Catalyst Learningacademy answered |
When a motor boat in a sea travels faster than sound, then waves just like shock-waves are produced on the surface of water. These waves are called bow waves.
Which of the following statement is or are correct about longitudinal mechanical waves?- a)The longitudinal mechanical waves which lie in the frequency range 20 Hz to 20000 Hz are called audible or sound waves.
- b)The longitudinal mechanical waves having frequencies less than 20 Hz are called infrasonic.
- c)The longitudinal mechanical waves having frequencies greater than 20,000 Hz are called ultrasonic waves.
- d)All of the above are correct
Correct answer is option 'D'. Can you explain this answer?
Which of the following statement is or are correct about longitudinal mechanical waves?
a)
The longitudinal mechanical waves which lie in the frequency range 20 Hz to 20000 Hz are called audible or sound waves.
b)
The longitudinal mechanical waves having frequencies less than 20 Hz are called infrasonic.
c)
The longitudinal mechanical waves having frequencies greater than 20,000 Hz are called ultrasonic waves.
d)
All of the above are correct
|
KS Coaching Center answered |
Sound or Audible waves are sensitive to human ear and are generated by the vibrating bodies like tuning fork, vocal cords etc. Infrasonic waves are produced by sources of bigger size such as earth quakes, volcanic eruptions, ocean waves etc. Human ear cannot detect Ultrasonic waves. But dog, cat, bat etc can detect these waves. Bat not only detect but also produce ultrasonic waves.
Name the characteristic of the sound which distinguishes a sharp sound from a grave or dull sound?- a)Intensity
- b)Echo
- c)Pitch
- d)Resonance
Correct answer is option 'C'. Can you explain this answer?
Name the characteristic of the sound which distinguishes a sharp sound from a grave or dull sound?
a)
Intensity
b)
Echo
c)
Pitch
d)
Resonance
|
|
Catalyst Learningacademy answered |
Pitch is that characteristic of sound which distinguishes a sharp or shrill sound from a grave or dull sound. It depends upon frequency. Higher the frequency higher will be the pitch and shriller will be the sound and vice versa.
Due to which phenomena sound is heard at longer distances in nights than in day?- a)Reflection
- b)Refraction
- c)Interference of sound
- d)Diffraction of sound
Correct answer is option 'D'. Can you explain this answer?
Due to which phenomena sound is heard at longer distances in nights than in day?
a)
Reflection
b)
Refraction
c)
Interference of sound
d)
Diffraction of sound
|
|
Paradigm Institute answered |
Diffraction is the bending or spreading out of waves when they encounter an obstacle or pass through a narrow opening. Sound waves can diffract around objects or through small openings, and this phenomenon allows sound to reach areas that are not directly in the line of sight.
During the day, the atmosphere near the ground is usually warmer than the air above, creating a temperature inversion that causes sound to be refracted upwards. This refraction results in the sound being directed away from the ground and reduces the distance over which it can be heard.
At night, the temperature inversion weakens or disappears, and the sound waves can diffract more effectively. As a result, sound can travel longer distances at night than during the day.
Therefore, the correct answer is D. Diffraction of sound.
Which of the following is/ are not applications of Ultrasonic Waves?
(a) For measuring the depth of Sea.
(b) In sterilizing of a liquid.
(c) In Ultrasonography
(d) In sterilizing a needle.- a)Both (a) and (b) Only (b)
- b)Only (d)
- c)Both (c) and (d)
- d)Only (b)
Correct answer is option 'B'. Can you explain this answer?
Which of the following is/ are not applications of Ultrasonic Waves?
(a) For measuring the depth of Sea.
(b) In sterilizing of a liquid.
(c) In Ultrasonography
(d) In sterilizing a needle.
(a) For measuring the depth of Sea.
(b) In sterilizing of a liquid.
(c) In Ultrasonography
(d) In sterilizing a needle.
a)
Both (a) and (b) Only (b)
b)
Only (d)
c)
Both (c) and (d)
d)
Only (b)
|
|
KS Coaching Center answered |
Applications of Ultrasonic Waves are: sending signals, for measuring the depth of sea, for cleaning cloths, aeroplanes, machinery parts of clocks, for removing lamp-shoot from the chimney of factories, in sterilizing of liquid and in Ultrasonography.
What is Intensity of Sound?- a)It is inversely proportional to the square of the distance of point from the source.
- b)It is directly proportional to the square of amplitude of vibration, square of frequency and density of the medium.
- c)Both A and B
- d)Neither A nor B
Correct answer is option 'C'. Can you explain this answer?
What is Intensity of Sound?
a)
It is inversely proportional to the square of the distance of point from the source.
b)
It is directly proportional to the square of amplitude of vibration, square of frequency and density of the medium.
c)
Both A and B
d)
Neither A nor B
|
|
Catalyst Learningacademy answered |
Intensity of any sound at any point in space is the amount of energy passing normally per unit area held around that point per unit time. S.I unit of intensity is watt/m2.
Chapter doubts & questions for Sound Wave - Lucent for GK 2025 is part of UPSC CSE exam preparation. The chapters have been prepared according to the UPSC CSE exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for UPSC CSE 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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