JEE Main & Advanced Physics Wave Mechanics Question Bank

done Musical Sound Total Questions - 32

• question_answer1)
  The walls of the halls built for music concerts should [NCERT 1979]
  A)
             Amplify sound                      done clear
  B)
             Transmit sound done clear
  C)
             Reflect sound                       done clear
  D)
             Absorb sound done clear
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• question_answer2)
  A spherical source of power 4 W and frequency 800 Hz is emitting sound waves. The intensity of waves at a distance 200 m is   [CPMT 1999; JIPMER 2000]
  A)
             \[8\times {{10}^{-6}}\,W/{{m}^{2}}\]                             done clear
  B)
             \[2\times {{10}^{-4}}\,W/{{m}^{2}}\] done clear
  C)
             \[1\times {{10}^{-4}}\,W/{{m}^{2}}\]                             done clear
  D)
             \[4\,W/{{m}^{2}}\] done clear
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• question_answer3)
  If the pressure amplitude in a sound wave is tripled, then the intensity of sound is increased by a factor of                                                                        [CPMT 1992; JIPMER 2000]
  A)
             9     done clear
  B)
             3 done clear
  C)
             6     done clear
  D)
             \[\sqrt{3}\] done clear
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• question_answer4)
  If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be                                                              [CBSE PMT 1992]
  A)
             Increased by a factor of 2        done clear
  B)
             Decreased by a factor of 2 done clear
  C)
             Decreased by a factor of 4 done clear
  D)
             Unchanged done clear
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• question_answer5)
  Intensity level of a sound of intensity I is 30 dB. The ratio \[\frac{I}{{{I}_{0}}}\] is (Where \[{{I}_{0}}\] is the threshold of hearing) [KCET 1999; J & K CET 2005]
  A)
             3000                                          done clear
  B)
             1000 done clear
  C)
             300 done clear
  D)
             30 done clear
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• question_answer6)
  Decibel is unit of                                                            [RPMT 2000]
  A)
             Intensity of light                  done clear
  B)
             X-rays radiation capacity done clear
  C)
             Sound loudness                   done clear
  D)
             Energy of radiation done clear
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• question_answer7)
  Quality of a musical note depends on  [MP PMT 1998; KCET 1999; RPET 2000]
  A)
             Harmonics present             done clear
  B)
             Amplitude of the wave done clear
  C)
             Fundamental frequency done clear
  D)
             Velocity of sound in the medium done clear
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• question_answer8)
  When we hear a sound, we can identify its source from [KCET (Med.) 2001]
  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
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• question_answer9)
  A man \[x\] can hear only upto 10 kHz and another man \[y\] upto 20 kHz. A note of frequency 500 Hz is produced before them from a stretched string. Then [KCET 2002]
  A)
             Both will hear sounds of same pitch but different quality done clear
  B)
             Both will hear sounds of different pitch but same quality done clear
  C)
             Both will hear sounds of different pitch and different quality done clear
  D)
             Both will hear sounds of same pitch and same quality done clear
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• question_answer10)
  The amplitude of two waves are in ratio 5 : 2. If all other conditions for the two waves are same, then what is the ratio of their energy densities                                         [MH CET 2004]
  A)
             5 : 2                                           done clear
  B)
             10: 4 done clear
  C)
             2.5 : 1                                       done clear
  D)
             25 : 4 done clear
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• question_answer11)
  A is singing a note and at the same time B is singing a note with exactly one-eighth the frequency of the note of A. The energies  of two sounds are equal, the amplitude of the note of B is               [NCERT 1981; AIIMS 2001]
  A)
             Same that of A                     done clear
  B)
             Twice as that of A done clear
  C)
             Four times as that of A     done clear
  D)
             Eight times as that of A done clear
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• question_answer12)
  The loudness and pitch of a sound depends on   [KCET 2004; Pb. PET 2003]
  A)
             Intensity and velocity done clear
  B)
             Frequency and velocity done clear
  C)
             Intensity and frequency done clear
  D)
             Frequency and number of harmonics done clear
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• question_answer13)
  If T is the reverberation time of an auditorium of volume V then                                                [KCET 2003]
  A)
             \[T\propto \frac{1}{V}\]   done clear
  B)
             \[T\propto \frac{1}{{{V}^{2}}}\] done clear
  C)
             \[T\propto {{V}^{2}}\]      done clear
  D)
             \[T\propto V\] done clear
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• question_answer14)
  The intensity of sound from a radio at a distance of 2 metres from its speaker is \[1\times {{0}^{-2}}\mu \ W/{{m}^{2}}.\] The intensity at a distance of 10 meters would be                              [CPMT 2005]
  A)
             \[0.2\times {{10}^{-2}}\mu \ W/{{m}^{2}}\]                done clear
  B)
             \[1\times {{10}^{-2}}\mu \ W/{{m}^{2}}\] done clear
  C)
             \[4\times {{10}^{-4}}\mu \ W/{{m}^{2}}\]                   done clear
  D)
             \[5\times {{10}^{-2}}\mu \ W/{{m}^{2}}\] done clear
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• question_answer15)
  The intensity of sound wave while passing through an elastic medium falls down by 10% as it covers one metre distance through the medium. If the initial intensity of the sound wave was 100 decibels, its value after it has passed through 3 metre thickness of the medium will be                [CPMT 1988]
  A)
             70 decibel                               done clear
  B)
             72.9 decibel done clear
  C)
             81 decibel                               done clear
  D)
             60 decibel done clear
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• question_answer16)
  A musical scale is constructed by providing intermediate frequencies between a note and its octave which  [CPMT 1972; NCERT 1980]
  A)
             Form an arithmetic progression done clear
  B)
             Form a geometric progression done clear
  C)
             Bear a simple ratio with their neighbours done clear
  D)
             Form a harmonic progression done clear
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• question_answer17)
  In a harmonium the intermediate notes between a note and its octave form                                      [CPMT 1973]
  A)
             An arithmetic progression done clear
  B)
             A geometric progression done clear
  C)
             A harmonic progression done clear
  D)
             An exponential progression done clear
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• question_answer18)
  The power of a sound from the speaker of a radio is 20 mW. By turning the knob of the volume control, the power of the sound is increased to 400 mW. The power increase in decibels as compared to the original power is
  A)
             13 dB                                        done clear
  B)
             10 dB done clear
  C)
             20 dB                                        done clear
  D)
             800 dB done clear
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• question_answer19)
  If separation between screen and source is increased by 2% what would be the effect on the intensity  [CPMT 2003]
  A)
             Increases by 4%                   done clear
  B)
             Increases by 2% done clear
  C)
             Decreases by 2%                 done clear
  D)
             Decreases by 4% done clear
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• question_answer20)
  The musical interval between two tones of frequencies 320 Hz and 240 Hz is                       [MP PMT 1992; AFMC 1992]
  A)
             80   done clear
  B)
             \[\left( \frac{4}{3} \right)\] done clear
  C)
             560 done clear
  D)
             320 × 240 done clear
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• question_answer21)
  In an orchestra, the musical sounds of different instruments are distinguished from one another by which of the following characteristics                                       [CBSE PMT 1993]
  A)
             Pitch                                         done clear
  B)
             Loudness done clear
  C)
             Quality                                     done clear
  D)
             Overtones done clear
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• question_answer22)
  The intensity level due to two waves of the same frequency in a given medium are 1 bel and 5 bel. Then the ratio of amplitudes is
  A)
             1 : 4                                           done clear
  B)
             1 : 2 done clear
  C)
             1 : 104                                       done clear
  D)
             1 : 102 done clear
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• question_answer23)
  It is possible to recognise a person by hearing his voice even if he is hidden behind a wall. This is due to the fact that his voice                                                     [CPMT 1972]
  A)
             Has a definite pitch            done clear
  B)
             Has a definite quality done clear
  C)
             Has a definite loudness    done clear
  D)
             Can penetrate the wall done clear
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• question_answer24)
  Of the following the one which emits sound of higher pitch is
  A)
             Mosquito                               done clear
  B)
             Lion done clear
  C)
             Man                                          done clear
  D)
             Woman done clear
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• question_answer25)
  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
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• question_answer26)
  Tone A has frequency of 240 Hz. Of the following tones, the one which will sound least harmonious with A is
  A)
             240 done clear
  B)
             480 done clear
  C)
             360 done clear
  D)
             450 done clear
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• question_answer27)
  Learned Indian classical vocalists do not like the accompaniment of a harmonium because            [MP PMT 1992]
  A)
             Intensity of the notes of the harmonium is too large done clear
  B)
             Notes of the harmonium are too shrill done clear
  C)
             Diatonic scale is used in the harmonium done clear
  D)
             Tempered scale is used in the harmonium done clear
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• question_answer28)
  Each of the properties of sound listed in column A primarily depends on one of the quantities in column B. Choose the matching pairs from two columns Column A                                           Column B             Pitch                                        Waveform             Quality                                    Frequency             Loudness                               Intensity                  [IIT 1980]
  A)
             Pitch-waveform, Quality-frequency; Loudness-intensity done clear
  B)
             Pitch-frequency, Quality-waveform; Loudness-intensity done clear
  C)
             Pitch-intensity, Quality-waveform; Loudness- frequency done clear
  D)
             Pitch-waveform, Quality- intensity; Loudness-frequency done clear
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• question_answer29)
  Intensity level 200 cm from a source of sound is 80 dB. If there is no loss of acoustic power in air and intensity of threshold hearing is \[{{10}^{-12}}W{{m}^{-2}}\] then, what is the intensity level at a distance of 400 cm from source
  A)
             Zero                                          done clear
  B)
             54 dB done clear
  C)
             64 dB                                        done clear
  D)
             44 dB done clear
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• question_answer30)
  A point source emits sound equally in all directions in a non-absorbing medium. Two points \[P\]and \[Q\]are at distances of \[2m\]and \[3m\] respectively from the source. The ratio of the intensities of the waves at \[P\]and \[Q\] is                [CBSE PMT 2005]
  A)
             9 : 4                                           done clear
  B)
             2 : 3 done clear
  C)
             3 : 2                                           done clear
  D)
             4 : 9 done clear
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• question_answer31)
  Quality depends on                                                     [AFMC 2003]
  A)
             Intensity                                 done clear
  B)
             Loudness done clear
  C)
             Timbre                                     done clear
  D)
             Frequency done clear
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• question_answer32)
  Two waves having sinusoidal waveforms have different wavelengths and different amplitude. They will be having                    [BHU 2005]
  A)
             Same pitch and different intensity                                  done clear
  B)
             Same quality and different intensity done clear
  C)
             Different quality and different intensity                       done clear
  D)
             Same quality and different pitch done clear
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