1. Question 1 of 100

   The human ear is most sensitive to frequencies in the range of about

   A 2–5 kHz B 20–100 Hz C 10–15 kHz D 15–20 kHz
2. Question 2 of 100

   The fundamental frequency of a stretched string does NOT depend on its

   A colour B length C tension D mass per unit length
3. Question 3 of 100

   Resonance occurs when

   A two sounds have different amplitudes B the driving frequency equals the natural frequency of a body C a wave is absorbed completely D a body is at rest
4. Question 4 of 100

   In a standing wave, the distance between two consecutive nodes is

   A λ B λ/4 C 2λ D λ/2
5. Question 5 of 100

   The fundamental frequency of an open pipe 1 m long (v = 340 m/s) is

   A 340 Hz B 170 Hz C 85 Hz D 680 Hz
6. Question 6 of 100

   As an ambulance siren approaches you, the pitch you hear is

   A lower than the original B unchanged C zero D higher than the original
7. Question 7 of 100

   A jet flies at Mach 2 where the speed of sound is 340 m/s. Its speed is

   A 680 m/s B 170 m/s C 342 m/s D 1,360 m/s
8. Question 8 of 100

   Two tuning forks of 256 Hz and 260 Hz sounded together produce a beat frequency of

   A 516 Hz B 258 Hz C 4 Hz D 1 Hz
9. Question 9 of 100

   A ship sends an ultrasonic pulse and receives the echo from the sea bed after 2 s. If the speed of sound in sea water is 1,500 m/s, the depth is

   A 3,000 m B 750 m C 300 m D 1,500 m
10. Question 10 of 100

    The loudness of a sound mainly depends on its

    A amplitude B frequency C wavelength D speed
11. Question 11 of 100

    The superposition of two waves to give a resultant of larger or smaller amplitude is called

    A diffraction B refraction C interference D dispersion
12. Question 12 of 100

    Sound cannot travel through

    A water B a vacuum C steel D air
13. Question 13 of 100

    The highest point of a transverse wave is called the

    A trough B crest C node D compression
14. Question 14 of 100

    In a pipe closed at one end, the first overtone has a frequency equal to

    A 2 times the fundamental B the fundamental C 3 times the fundamental D 4 times the fundamental
15. Question 15 of 100

    A sonic boom is produced when

    A a sound is reflected B an object travels at the speed of light C two sounds produce beats D an object travels faster than the speed of sound
16. Question 16 of 100

    Astronauts on the Moon talk using radio sets because

    A sound is too slow on the Moon B their helmets absorb light C gravity on the Moon is too strong D the Moon has no atmosphere to carry sound
17. Question 17 of 100

    If the amplitude of a sound wave is doubled, its intensity becomes

    A 4 times B 2 times C 8 times D unchanged
18. Question 18 of 100

    For a clear echo to be heard, the minimum distance between the source and the reflecting surface in air (speed ≈ 344 m/s) is about

    A 34 m B 8.5 m C 17 m D 170 m
19. Question 19 of 100

    We can hear a person talking around a corner but cannot see him because

    A sound is faster than light B light is a longitudinal wave C sound is absorbed by corners D sound has a much longer wavelength and diffracts more
20. Question 20 of 100

    The fundamental frequency of a pipe closed at one end of length 0.5 m (v = 340 m/s) is

    A 340 Hz B 170 Hz C 680 Hz D 85 Hz
21. Question 21 of 100

    Polarisation is possible for transverse waves but not for sound in air because sound waves are

    A longitudinal B too fast C mechanical in nature only D of low frequency
22. Question 22 of 100

    The sound level of normal conversation is about

    A 10 dB B 100 dB C 60 dB D 140 dB
23. Question 23 of 100

    Which of the following is a transverse wave?

    A Sound wave in air B Light wave C Ultrasound D Infrasound
24. Question 24 of 100

    The audible range of frequencies for a normal human ear is

    A 2 Hz to 200 Hz B 20 Hz to 20,000 Hz C 200 Hz to 2,000 Hz D 20,000 Hz to 200,000 Hz
25. Question 25 of 100

    Newton's formula for the speed of sound gave a value lower than the observed one. Laplace corrected it by assuming that sound propagation is

    A adiabatic B isothermal C isobaric D isochoric
26. Question 26 of 100

    The speed of a transverse wave on a stretched string is

    A √(μ/T) B T/μ C Tμ D √(T/μ)
27. Question 27 of 100

    The Doppler effect is the

    A apparent change in frequency due to relative motion of source and observer B change in speed of sound with temperature C change in amplitude with distance D bending of sound around an obstacle
28. Question 28 of 100

    The speed of sound in air increases when temperature increases because

    A air becomes denser B sound frequency increases C air molecules move faster and transmit vibrations quickly D amplitude increases
29. Question 29 of 100

    A pipe closed at one end produces

    A only even harmonics B all harmonics C no harmonics D only odd harmonics
30. Question 30 of 100

    The time period of a wave of frequency 25 Hz is

    A 0.04 s B 25 s C 0.4 s D 4 s
31. Question 31 of 100

    The unit used to measure sound intensity level (loudness level) is

    A hertz (Hz) B decibel (dB) C pascal (Pa) D metre per second (m/s)
32. Question 32 of 100

    In a sound wave, regions of high pressure are called

    A rarefactions B crests C nodes D compressions
33. Question 33 of 100

    An echo is caused by

    A refraction of sound B reflection of sound C absorption of sound D diffraction of sound
34. Question 34 of 100

    For a supersonic aircraft at Mach 2, the half-angle of the Mach cone is

    A 60° B 45° C 90° D 30°
35. Question 35 of 100

    The pitch of a sound depends on its

    A amplitude B speed in air C frequency D loudness
36. Question 36 of 100

    An increase of 20 dB corresponds to an intensity increase by a factor of

    A 20 B 200 C 2 D 100
37. Question 37 of 100

    If the amplitude of a sound wave is increased, the sound becomes

    A shriller B slower C louder D lower in pitch
38. Question 38 of 100

    A wave of speed 340 m/s and frequency 170 Hz has a wavelength of

    A 2 m B 0.5 m C 57,800 m D 510 m
39. Question 39 of 100

    A source of 500 Hz moves towards a stationary observer at 34 m/s (v = 340 m/s). The observed frequency is about

    A 556 Hz B 450 Hz C 550 Hz D 500 Hz
40. Question 40 of 100

    Sound with frequency below 20 Hz is called

    A ultrasound B infrasound C supersonic sound D audible sound
41. Question 41 of 100

    A wave has a frequency of 50 Hz and a wavelength of 4 m. Its speed is

    A 12.5 m/s B 54 m/s C 0.08 m/s D 200 m/s
42. Question 42 of 100

    Sound waves in air are

    A transverse waves B electromagnetic waves C longitudinal waves D stationary waves only
43. Question 43 of 100

    A gel is applied between the probe and the skin during an ultrasound scan to

    A remove air gaps and improve impedance matching B cool the probe C increase the frequency of waves D absorb the echoes
44. Question 44 of 100

    A sound of intensity 10⁻⁶ W/m² has a level of (I₀ = 10⁻¹² W/m²)

    A 6 dB B 120 dB C 60 dB D 600 dB
45. Question 45 of 100

    Constructive interference occurs when the path difference between two coherent waves is

    A (n + ½)λ B λ/4 only C nλ (n = 0, 1, 2, …) D (2n + 1)λ/4
46. Question 46 of 100

    Sound with frequency above 20,000 Hz is called

    A ultrasound B infrasound C audible sound D subsonic noise
47. Question 47 of 100

    Sound travels fastest through

    A liquids B gases C solids D a vacuum
48. Question 48 of 100

    The number of waves passing a point in one second is the

    A wavelength B frequency C amplitude D speed
49. Question 49 of 100

    Which part of the ear first receives sound vibrations and starts to vibrate?

    A Cochlea B Ear lobe nerve C Eardrum D Semicircular canals
50. Question 50 of 100

    Which part of the inner ear helps in maintaining body balance?

    A Cochlea B Eardrum C Eustachian tube D Semicircular canals
51. Question 51 of 100

    When two identical sound sources replace one, the sound level increases by about

    A 6 dB B 3 dB C 10 dB D 20 dB
52. Question 52 of 100

    Unpleasant and unwanted sound is called

    A music B echo C noise D resonance
53. Question 53 of 100

    Compared with a man's voice, a woman's voice generally has

    A higher pitch B lower pitch C lower frequency D larger amplitude always
54. Question 54 of 100

    The threshold of pain for the human ear is approximately

    A 60 dB B 120 dB C 20 dB D 0 dB
55. Question 55 of 100

    Beats are produced when two sound waves of

    A equal frequencies are superposed B slightly different frequencies are superposed C very different frequencies travel in opposite media D equal amplitudes only are produced
56. Question 56 of 100

    Which of the following waves does NOT need a medium to travel?

    A Sound waves B Water waves C Waves on a string D Radio waves
57. Question 57 of 100

    Sound travels ______ in humid air than in dry air.

    A slower B at the same speed C not at all D faster
58. Question 58 of 100

    The energy transmitted by a wave per unit time is proportional to

    A amplitude and frequency B square root of amplitude C square of amplitude and square of frequency D wavelength only
59. Question 59 of 100

    The speed of sound in an ideal gas is proportional to

    A absolute temperature B the square root of absolute temperature C square of the temperature D the pressure only
60. Question 60 of 100

    The SI unit of sound intensity is

    A watt per square metre (W/m²) B watt (W) C joule (J) D newton (N)
61. Question 61 of 100

    The approximate speed of sound in air at room temperature (about 20 °C) is

    A 34.3 m/s B 3,430 m/s C 300,000 km/s D 343 m/s
62. Question 62 of 100

    In the wave equation y = A sin(kx − ωt), the wave number k equals

    A λ/2π B 2πf C 2π/λ D 1/T
63. Question 63 of 100

    According to Sabine's formula, reverberation time is directly proportional to

    A absorption of the room B speed of the audience C volume of the room D frequency of the speaker
64. Question 64 of 100

    A wave transfers

    A energy without transferring matter B matter without energy C both matter and energy D neither matter nor energy
65. Question 65 of 100

    Thunder is heard after lightning is seen because

    A sound travels faster than light B lightning produces no sound C light travels much faster than sound D thunder is produced later in the clouds only
66. Question 66 of 100

    Sound is often heard from farther distances at night because

    A sound travels slower at night B noise is less at night only C air is denser at higher altitude D refraction bends sound towards the cooler ground
67. Question 67 of 100

    Bats find their way in the dark by using

    A ultrasonic echoes B infrasound C light reflection D magnetic fields
68. Question 68 of 100

    The SI unit of time period of a wave is

    A hertz B metre C second D decibel
69. Question 69 of 100

    Reverberation is

    A the splitting of sound into two waves B the persistence of sound due to repeated reflections C absorption of sound by walls D the speed change of sound at boundaries
70. Question 70 of 100

    An increase of 10 dB in sound level means the intensity becomes

    A 2 times B 100 times C 1,000 times D 10 times
71. Question 71 of 100

    Sound is produced by

    A moving objects B vibrating objects C heated objects D charged objects
72. Question 72 of 100

    A wave is described by y = 5 sin(200πt − 0.5πx). Its frequency is

    A 200 Hz B 0.5 Hz C 100 Hz D 400 Hz
73. Question 73 of 100

    Ultrasonic waves are commonly generated using the

    A photoelectric effect B Doppler effect C piezoelectric effect of quartz crystals D Zeeman effect
74. Question 74 of 100

    A string fixed at both ends has a fundamental frequency f. The frequency of its third harmonic is

    A 3f B f/3 C 2f D 5f
75. Question 75 of 100

    Mach number is defined as the ratio of

    A speed of sound to speed of the object B speed of the object to speed of sound C speed of light to speed of sound D frequency to wavelength
76. Question 76 of 100

    In an auditorium, curtains, carpets and cushioned seats are used to

    A reflect sound to the roof B increase echo C absorb sound and reduce reverberation D increase sound speed
77. Question 77 of 100

    For pipes of equal length, the ratio of the fundamental frequency of a closed pipe to that of an open pipe is

    A 2 : 1 B 1 : 2 C 1 : 1 D 1 : 4
78. Question 78 of 100

    If the tension in a stretched string is made four times, the speed of the wave on it becomes

    A 4 times B 8 times C 1/2 D 2 times
79. Question 79 of 100

    A stationary source emits 400 Hz. An observer moves towards it at 34 m/s (v = 340 m/s). The observed frequency is

    A 360 Hz B 440 Hz C 400 Hz D 434 Hz
80. Question 80 of 100

    A loudspeaker converts

    A sound energy into electrical energy B electrical energy into sound energy C light energy into sound energy D heat energy into sound energy
81. Question 81 of 100

    Dispersion of a wave means

    A variation of wave speed with frequency B bending around an obstacle C change in amplitude with distance D reflection from a boundary
82. Question 82 of 100

    Ultrasound scanning (sonography) is preferred over X-rays for examining a foetus because

    A it has a higher energy than X-rays B it travels faster than light C ultrasound is non-ionising and safer D it needs no equipment
83. Question 83 of 100

    A 340 Hz sound passes from air (340 m/s) into a medium where its speed is 1,360 m/s. Its new wavelength is

    A 1 m B 0.25 m C 16 m D 4 m
84. Question 84 of 100

    Waves on the surface of water are examples of

    A mechanical waves B electromagnetic waves only C matter waves D gamma waves
85. Question 85 of 100

    A sitar and a flute play the same note but sound different. This is due to difference in

    A pitch B loudness C speed D quality (timbre)
86. Question 86 of 100

    In a drum, sound is produced by the vibration of

    A an air column B a metal rod C a stretched membrane D a hollow pipe
87. Question 87 of 100

    The distance between two consecutive crests of a wave is called

    A wavelength B amplitude C frequency D time period
88. Question 88 of 100

    The approximate speed of sound in water is

    A 1,480 m/s B 148 m/s C 14,800 m/s D 343 m/s
89. Question 89 of 100

    The relation between wave speed (v), frequency (f) and wavelength (λ) is

    A v = f / λ B v = λ / f² C v = f λ D v = f + λ
90. Question 90 of 100

    When a sound wave passes from air into water, the quantity that remains unchanged is its

    A wavelength B speed C direction always D frequency
91. Question 91 of 100

    The three tiny bones of the middle ear (hammer, anvil, stirrup) function to

    A amplify and transmit vibrations to the inner ear B produce sound C filter high frequencies only D convert sound to light
92. Question 92 of 100

    The SI unit of frequency is

    A newton (N) B joule (J) C watt (W) D hertz (Hz)
93. Question 93 of 100

    The phase difference between two waves producing destructive interference is

    A 0 B π radian (180°) C 2π radian D π/4 radian
94. Question 94 of 100

    SONAR stands for Sound Navigation and Ranging and works by using

    A radio waves B X-rays C infrared rays D ultrasonic waves
95. Question 95 of 100

    The time for which the ear retains the impression of a sound (persistence of hearing) is about

    A 1 s B 0.001 s C 10 s D 0.1 s
96. Question 96 of 100

    Acoustic impedance of a medium is given by

    A density ÷ speed of sound B density × speed of sound (ρv) C speed ÷ frequency D pressure × volume
97. Question 97 of 100

    The sound level of a whisper is about

    A 30 dB B 90 dB C 130 dB D 0 dB
98. Question 98 of 100

    Ultrasound frequencies used in medical diagnostic imaging typically lie in the range

    A 20–200 Hz B 1–20 MHz C 1–10 kHz D 1–10 GHz
99. Question 99 of 100

    The decibel scale is

    A logarithmic B linear C exponential growth only D constant
100. Question 100 of 100

     The quality or timbre of a sound allows us to

     A measure its speed B distinguish two sounds of the same pitch and loudness C find its frequency only D find its amplitude only

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