An empty vessel produces louder sound than a filled one because
A)
The liquid in the filled vessel absorbs the vibrations of the liquid molecules
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B)
The air molecules in empty vessel have greater amplitude and hence greater intensity than liquid molecules in the filled vessel
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C)
The density of air is less than the density of liquid contained in the vessel when filled
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D)
The kinetic energy of particles constituting the air column is greater as compared to the kinetic energy of particles of liquid column
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Echo is the effect produced due to
A)
Reflection of sound
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B)
Dispersion of sound
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C)
Absorption of sound
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D)
Refraction of sound
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A stone is dropped in a well and splash is heard after 1.5 seconds after the stone hits the water surface. If the velocity of sound is 327 m/s, the depth of the well is
A)
654.0 m
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B)
490.5 m
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C)
227 m
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D)
981.0 m
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During thunderstorm lightning is seen first and thunder is heard later on why?
A)
First light and then sound is produced
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B)
Light travels faster than sound
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C)
Sound travels faster than light
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D)
Sound becomes feeble due to storm
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In the microphone, used in the public address system
A)
Electric signals are first converted into sound waves
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B)
Sound waves are directly transmitted
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C)
Sound waves are converted into electric signals which are amplified and transmitted
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D)
Amplification is not required
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Sitar maestro Ravi Shankar is playing sitar on its strings, and you, as a physicist (unfortunately without musical ears), observed the following oddities. I. The greater the length of a vibrating string, the smaller its frequency. II. The greater the tension in the string, the greater is the frequency III. The heavier the mass of the string, the smaller the frequency. IV. The thinner the wire, the higher its frequency. The maestro signalled the following combination as correct one:
A)
II, III and IV
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B)
I, II and IV
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C)
I, II and III
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D)
I, II, III and IV
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A big explosion on the Moon cannot be heard on the Earth because
A)
The explosion produces high frequency sound wave which are inaudible
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B)
Sound waves require a material medium for propagation
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C)
Sound waves are absorbed in the atmosphere of moon
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D)
Sound waves are absorbed in Earth's atmosphere
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A man sets his watch by a whistle that is 2 km away. How much will his watch be in error, (speed of sound in air 330 m/sec)
A)
3 seconds fast
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B)
3 seconds slow
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C)
6 seconds fast
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D)
6 seconds slow
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Velocity of sound is maximum in
A)
Air
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B)
Water
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C)
Vacuum
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D)
Steel
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Frequency range of the audible sounds is
A)
0 Hz - 30 Hz
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B)
20 Hz - 20 kHz
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C)
20 kHz - 20,000 kHz
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D)
20 kHz - 20 MHz
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On which principle does sonometer works
A)
Hooke's Law
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B)
Elasticity
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C)
Resonance
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D)
Newton's Law
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When we hear a sound, we can identify its source from
A)
Amplitude of sound
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B)
Intensity of sound
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C)
Wavelength of sound
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D)
Overtones present in the sound
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In the musical octave ' Sa', 'Re', 'Ga'
A)
The frequency of the note 'Sa' is greater than that of ?Re', 'Ga'
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B)
The frequency of the note 'Sa' is smaller than that of 'Re', 'Ga'
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C)
The frequency of all the notes 'Sa', 'Re', 'Ga' is the same
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D)
The frequency decreases in the sequence 'Sa', "Re', 'Ga'
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In an orchestra, the musical sounds of different instruments are distinguished from one another by which of the following characteristics
A)
Pitch
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B)
Loudness
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C)
Quality
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D)
Overtones
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The material used for making the seats in an auditorium has sound absorbing properties. Why?
A)
It reduces reverberations.
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B)
It makes the quality of sound better
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C)
It makes the sound travel faster
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D)
All of the above
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Sitar is a
A)
Wind instrument
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B)
stringed instrument
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C)
Percussion instrument
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D)
reed instrument
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Bats can hunt at night
A)
Their eyesight is good
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B)
They can smell their prey
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C)
The high-pitched ultrasonic squeaks of the pat are reflected from the obstacles or prey and returned to bat's ear and thus the bat is able to detect.
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D)
All of the above
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To hear a distinct echo, the minimum distance of a reflecting surface should be :
A)
17 metres
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B)
34 metres
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C)
68 metres
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D)
340 metres
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Earthquake produces which kind of sound before the main shock wave begins
A)
Ultrasound
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B)
infrasound
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C)
Audible sound
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D)
none of the above
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Speed of sound
A)
Decreases when we go from solid to gaseous state
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B)
Increases with increase in temperature
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C)
Depends upon properties of the medium through which it travels
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D)
All these statements are correct
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