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
done
clear
B)
The air molecules in empty vessel have greater amplitude and hence greater intensity than liquid molecules in the filled vessel
done
clear
C)
The density of air is less than the density of liquid contained in the vessel when filled
done
clear
D)
The kinetic energy of particles constituting the air column is greater as compared to the kinetic energy of particles of liquid column
done
clear
View Answer play_arrow
Echo is the effect produced due to
A)
Reflection of sound
done
clear
B)
Dispersion of sound
done
clear
C)
Absorption of sound
done
clear
D)
Refraction of sound
done
clear
View Answer play_arrow
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
done
clear
B)
490.5 m
done
clear
C)
227 m
done
clear
D)
981.0 m
done
clear
View Answer play_arrow
During thunderstorm lightning is seen first and thunder is heard later on why?
A)
First light and then sound is produced
done
clear
B)
Light travels faster than sound
done
clear
C)
Sound travels faster than light
done
clear
D)
Sound becomes feeble due to storm
done
clear
View Answer play_arrow
In the microphone, used in the public address system
A)
Electric signals are first converted into sound waves
done
clear
B)
Sound waves are directly transmitted
done
clear
C)
Sound waves are converted into electric signals which are amplified and transmitted
done
clear
D)
Amplification is not required
done
clear
View Answer play_arrow
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
done
clear
B)
I, II and IV
done
clear
C)
I, II and III
done
clear
D)
I, II, III and IV
done
clear
View Answer play_arrow
A big explosion on the Moon cannot be heard on the Earth because
A)
The explosion produces high frequency sound wave which are inaudible
done
clear
B)
Sound waves require a material medium for propagation
done
clear
C)
Sound waves are absorbed in the atmosphere of moon
done
clear
D)
Sound waves are absorbed in Earth's atmosphere
done
clear
View Answer play_arrow
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
done
clear
B)
3 seconds slow
done
clear
C)
6 seconds fast
done
clear
D)
6 seconds slow
done
clear
View Answer play_arrow
Velocity of sound is maximum in
A)
Air
done
clear
B)
Water
done
clear
C)
Vacuum
done
clear
D)
Steel
done
clear
View Answer play_arrow
Frequency range of the audible sounds is
A)
0 Hz - 30 Hz
done
clear
B)
20 Hz - 20 kHz
done
clear
C)
20 kHz - 20,000 kHz
done
clear
D)
20 kHz - 20 MHz
done
clear
View Answer play_arrow
On which principle does sonometer works
A)
Hooke's Law
done
clear
B)
Elasticity
done
clear
C)
Resonance
done
clear
D)
Newton's Law
done
clear
View Answer play_arrow
When we hear a sound, we can identify its source from
A)
Amplitude of sound
done
clear
B)
Intensity of sound
done
clear
C)
Wavelength of sound
done
clear
D)
Overtones present in the sound
done
clear
View Answer play_arrow
In the musical octave ' Sa', 'Re', 'Ga'
A)
The frequency of the note 'Sa' is greater than that of ?Re', 'Ga'
done
clear
B)
The frequency of the note 'Sa' is smaller than that of 'Re', 'Ga'
done
clear
C)
The frequency of all the notes 'Sa', 'Re', 'Ga' is the same
done
clear
D)
The frequency decreases in the sequence 'Sa', "Re', 'Ga'
done
clear
View Answer play_arrow
In an orchestra, the musical sounds of different instruments are distinguished from one another by which of the following characteristics
A)
Pitch
done
clear
B)
Loudness
done
clear
C)
Quality
done
clear
D)
Overtones
done
clear
View Answer play_arrow
The material used for making the seats in an auditorium has sound absorbing properties. Why?
A)
It reduces reverberations.
done
clear
B)
It makes the quality of sound better
done
clear
C)
It makes the sound travel faster
done
clear
D)
All of the above
done
clear
View Answer play_arrow
Sitar is a
A)
Wind instrument
done
clear
B)
stringed instrument
done
clear
C)
Percussion instrument
done
clear
D)
reed instrument
done
clear
View Answer play_arrow
Bats can hunt at night
A)
Their eyesight is good
done
clear
B)
They can smell their prey
done
clear
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.
done
clear
D)
All of the above
done
clear
View Answer play_arrow
To hear a distinct echo, the minimum distance of a reflecting surface should be :
A)
17 metres
done
clear
B)
34 metres
done
clear
C)
68 metres
done
clear
D)
340 metres
done
clear
View Answer play_arrow
Earthquake produces which kind of sound before the main shock wave begins
A)
Ultrasound
done
clear
B)
infrasound
done
clear
C)
Audible sound
done
clear
D)
none of the above
done
clear
View Answer play_arrow
Speed of sound
A)
Decreases when we go from solid to gaseous state
done
clear
B)
Increases with increase in temperature
done
clear
C)
Depends upon properties of the medium through which it travels
done
clear
D)
All these statements are correct
done
clear
View Answer play_arrow
