Practice Test

Q1) In transverse waves, particles of the medium vibrate Show Answer

Q2) Which of the following is correct formula for velocity of transverse wave ? Show Answer

Q3) The audible frequency range of human ear is 20 Hz and 20 kHz. The corresponding wave length range is
[ speed of sound in air = 340 m/s] Show Answer

Q4) According to Laplace, modulus of elasticity is the adiabatic modulus of elasticity of air medium and it is given by Show Answer

Q5) The distance between two consecutive crests in a wave train produced in a string is 5 cm. If two complete waves pass through any point per second, the velocity of sound is Show Answer

Q6) Which of the following is NOT the correct formula representing velocity of sound ? Show Answer

Q7) The correct equation for velocity of sound in a medium given by Laplace is Show Answer

Q8) Sound waves do not get generated from Show Answer

Q9) Oscillatory or vibrating motion means to and fro motion Show Answer

Q10) In case of sound waves amplitude means Show Answer

Q11) The amplitude of vibration of oscillating particle goes on decreasing because it is opposed by Show Answer

Q12) The frequency of oscillation of a particle is the number of oscillation made by particle in Show Answer

Q13) Wave motion is a propogation of disturbance through the medium in terms of Show Answer

Q14) Which of the following waves do not require material medium for propogation ? Show Answer

Q15) For a wave which of the following statement is true ? Show Answer

Q16) For propogation of sound wave medium should be Show Answer

Q17) Which of the following is not an example of mechanical waves ? Show Answer

Q18) Wave motion is periodic in Show Answer

Q19) Sound is a form of energy for which Show Answer

Q20) Particles of the medium Show Answer

Q21) Choose WRONG statement Show Answer

Q22) Progressive waves in a vibrating medium have same Show Answer

Q23) Progressive wave with doubly periodic means Show Answer

Q24) Sound waves are Show Answer

Q25) Which of the following is not the characteristic of the progressive wave ? Show Answer

Q26) Two particles of the medium are in same phase, then distance between them is Show Answer

Q27) In a wave motion if direction of propogation is perpendicular to the vibration of the particle, then it is Show Answer

Q28) Transverse wave has the following directions to observe, identify CORRECT one. Show Answer

Q29) Distinguishing property of transverse and longitudinal waves is that Show Answer

Q30) When transverse waves advance through a medium Show Answer

Q31) The transverse wave can travel through Show Answer

Q32) Velocity of transverse wave travelling through a string having tension 25 N and linear density 1 kg/m is Show Answer

Q33) Compression is the region where particles of the medium are Show Answer

Q34) Distance between any two compression or rarefaction in longitudinal wave is Show Answer

Q35) Which of the following are responsible for transfer of energy in longitudinal wave ? Show Answer

Q36) When longitudinal wave advances through a medium Show Answer

Q37) Longitudinal waves cannot be polarised because Show Answer

Q38) ________ is produced when an object is set into vibrations Show Answer

Q39) Each particle of the medium vibrate with _____ amplitude. Show Answer

Q40) The distance covered by the disturbance (wave) per second is called Show Answer

Q41) When wave changes the medium, the ______ does not change. Show Answer

Q42) Sound wave propogation is NOT possible through Show Answer

Q43) The propogation of sound waves through homogeneous medium was studied by Show Answer

Q44) The ______ is developed during compression. Show Answer

Q45) According to Newton's assumption the temperature of the gases medium _____ when sound waves travel through medium. Show Answer

Q46) With the rise of temperature, the speed of sound in a gas Show Answer

Q47) The velocity of sound in air increases with increase in Show Answer

Q48) The speed of sound is NOT affected by Show Answer

Q49) Pitch of a note depends upon Show Answer

Q50) Quality of a musical note depends upon Show Answer

Q51) Every musical sound can be regarded as combination of Show Answer

Q52) Loudness can be increased by Show Answer

Q53) Loudness of the sound depends upon Show Answer

Q54) Two musical sounds may NOT differ on which of the following characteristic ? Show Answer

Q55) A note is Show Answer

Q56) A series of notes seperated by a fixed musical intervals constitute Show Answer

Q57) When two astronauts talk on the surface of the moon then Show Answer

Q58) A musical interval 4:3 is Show Answer

Q59) Transverse waves can not propogate through liquids and gases because Show Answer

Q60) In the formation of longitudinal wave particle communicate disturbance to next particle in time T( periodic time) Show Answer

Q61) The tuning forks of frequencies 320 Hz and 340 Hz produce sound waves of wavelength differing by 6 cm in air. The velocity of sound in air is Show Answer

Q62) If the splash is heard 4.23 s after a stone dropped into a pit in which water level is 78.4 m deep, the velocity of sound is Show Answer

Q63) A source of frequency 500 Hz produces waves. If wave length is 0.1 m, the waves travel distance of 300 m in Show Answer

Q64) A tunning fork vibrates and produces concentric transverse waves on the surface of water. If distance between 10 crests is 9.0 m and velocity of wave on the surface of water is 450 m/s, then frequency of the tunning fork is Show Answer

Q65) A man standing between two cliffs claps his hands and starts hearing series of a echoes at interval of one second. Since the speed of sound in air 340 m/s, the distance between cliffs must be Show Answer

Q66) Which of the following is CORRECT way to identify a longitudinal wave ? Show Answer

Q67) Sound travels fastest in Show Answer

Q68) Loudness of the sound does not depends upon Show Answer

Q69) The pleasant sensation produced when two notes simultaneously sounded together is Show Answer

Q70) Which of the following is NOT the intervals in diatonic scale ? Show Answer

Q71) Which of the following is NOT correct condition for the propogation of mechanical wave through a medium ? Show Answer

Q72) Choose INCORRECT example of an oscillating particle.
Show Answer

Q73) Choose WRONG statement.
Show Answer

Q74) For the propogation of transverse wave the medium should possess the property of Show Answer

Q75) The correct velocity pressure graph for sound wave is Show Answer

Q76) In a transverse wave the angle between particle velocity and the wave velocity is Show Answer

Q77) If the pressure amplitude in a sound wave is doubled, then intensity of sound is increased by a factor Show Answer

Q78) The speed of sound in air and water is 340 m/s. and 1420 m/s respectively. If sound waves have a wavelength of 2m in air, then the frequency of the same sound waves in water will be Show Answer

Q79) Frequency of audible sound waves ranges between 20 Hz and 20 KHz. If the velocity of sound in air is 320 m/s, the range of the wavelengths of the sound in air is Show Answer

Q80) When a sound wave of frequency 30 Hz passes through a medium, the maximum displacement of a particle of the medium is 0.1 cm. The maximum velocity of the particle will be Show Answer

Q81) If the ratio of the amplitudes of two waves is 4: 3, then so the ratio of the maximum and minimum intensities is Show Answer

Q82) The particles of a medium vibrate about their mean positions whenever a wave travels through that medium. The phase difference between the vibrations of two such particles Show Answer

Q83) In a medium, sound travels 2 km in 3 seconds and in air it travels 3 km in 10 seconds. The ratio of the wavelengths of sound in the two media is Show Answer

Q84) When sound waves are reflected from a denser medium Show Answer

Q85) When a longitudinal wave is reflected from a rarer medium Show Answer

Q86) A sine wave is travelling in a medium. What is the minimum distance between two particles on the wave, which always have the same speed? Show Answer

Q87) What is the phase difference between two successive crests in a wave? Show Answer

Q88) A note has a frequency of 128 Hz. What is the frequency of a note two octaves higher than it? Show Answer

Q89) A travelling wave has the frequency v and particle displacement amplitude A. What is the particle acceleration amplitude? Show Answer

Q90) The waves produced by a motorboat, sailing in water, are Show Answer

Q91) When a longitudinal wave propagates through a medium, the particles of the medium execute simple harmonic oscillations about their mean positions. These oscillations of a particle are characterised by an invariant Show Answer

Q92) A light pointer fixed to one prong of a tuning fork touches a vertical plate. The fork is set vibrating and the plate is allowed to fall freely. Eight oscillations are counted when the plate falls through 10 cm. What is the frequency of the tuning fork? Show Answer

Q93) A uniform rope of length 12 m and mass 6 kg hangs vertically from a rigid support. A block of mass 2 kg is attached to the free end of the rope. A transverse pulse of wavelength 0.06 m is produced at the lower end of the rope. What is the wavelength of the pulse when it reaches the top of the rope? Show Answer

Q94) A progressive wave of frequency 50 Hz is travelling with a velocity of 350 m/s. through a medium. What is the change in phase at a given place in time interval of 0.01 second? Show Answer

Q95) The equation of a simple harmonic progressive wave having amplitude 5 mm, period 2 second and wavelength 2 m and travelling along the positive direction of the x-axis is given by Show Answer

Q96) When a sound wave of frequency 200 Hz travels through a medium, the maximum displacement of a particle of the medium is 0.2 cm. The maximum velocity of the particle is Show Answer

Q97) A sound wave of frequency 20 Hz covers a distance AB of 300 m in 10 s. What is the number of waves between A and B? Show Answer

Q98) Two sound waves of frequencies 100 Hz and 200 Hz, travel in the same medium at the same temperature. What is the ratio of their velocities? Show Answer

Q99) A simple harmonic progressive wave has a wavelength 40 cm, periodic time 10 s and zero initial phases. What is the phase of an oscillating particle at a distance of 10 cm form the source at an instant t = 5 s? Show Answer

Q100) If V is the velocity of the wave and omega is the angular velocity, then the propagation constant (K) of the wave is given by Show Answer

Q101) In a simple harmonic progressive wave, the maximum particle velocity is twice the wave velocity. If lambda is the wavelength, then its amplitude is given by Show Answer

Q102) A simple harmonic progressive wave of frequency 100 Hz is travelling along the positive direction of the X axis. What is the propagation constant, if the velocity of the wave is 500 m/s? Show Answer

Q103) A progressive wave is travelling along the positive direction of the x-axis. For this wave, amplitude = 5 cm, period = 0.2 s and wavelength = 30 cm.
The equation of the wave using SI units is given by Show Answer

Q104) When a tuning fork and a source of frequency 200 Hz were sounded together, 4 beats were heard per second. When the tuning fork was loaded with some wax, again beats were produced per second. The original frequency of the tuning fork was Show Answer

Q105) A tuning fork of unknown frequency x, produces 5 beats per second with a tuning fork of frequency of 250 Hz. It produces 10 beats /second with another tuning fork of frequency 265 Hz. The unknown frequency is Show Answer

Q106) The resultant wave produced due to superposition of two sound waves of equal amplitude (A) and nearly equal frequencies has a variable amplitude (R). The ratio of the maximum value of R to the amplitude of any one of the wave is Show Answer

Q107) A set of 31 tuning forks is arranged in a series of decreasing frequencies. Each fork gives 6 beats /second with the preceding one. The first fork is the octave of the last. The frequency of the last tuning fork is Show Answer

Q108) A tuning fork A produces 4 beats/second with another tuning fork of frequency 246 Hz. When the prongs of A are filed a little, the number of beats heard is 6 per second. What is the original frequency of the fork A? Show Answer

Q109) Two tuning forks of frequencies 100 Hz and 105 Hz are sounded together. The time interval between the successive waxing of sound will be Show Answer

Q110) Ten tuning forks are arranged in increasing order of frequency so that any two consecutive forks produce 4 beats/sec. The highest frequency is twice that of the lowest. The possible lowest and highest frequencies in Hz are Show Answer

Q111) 31 tuning forks are arranged in series in increasing order of frequencies and the frequency of the last tuning fork is 3 times the frequency of the first. If each tuning fork produces 4 beats/second with the preceding one, the frequency of the last tuning fork is Show Answer

Q112) Two waves having the same frequency, velocity and phase travel in the same direction. If their amplitudes are a and 2a, then the resultant amplitude will be Show Answer

Q113) The frequency of a tuning fork, as given by the manufacturer is 512 Hz. The frequency is tested by using an accurate oscillator. It is found that the fork produces 2 beats/sec, when the oscillator reads 514 Hz. But when the oscillator reads 510 Hz, the tuning fork produces 6 beats/sec. The actual frequency of the fork is Show Answer

Q114) Two waves of wavelengths 2 m and 2.02 m respectively, moving with the same velocity superpose to produce 2 beats/second. The velocity of the waves is Show Answer

Q115) Two tuning forks A and B produce notes of frequencies 250 Hz and 260 Hz respectively. When an unknown note is sounded with A it produces x beats/sec. But when the same note is sounded with B, the number of beats produced per second becomes 4 x. The unknown frequency could be Show Answer

Q116) The speed of sound in a gas is 500 m/s. Two sound waves progressing simultaneously through this gas produce 5 beats/sec. If the wavelength of one of them is 2.5 m, then the wavelength of the other will be Show Answer

Q117) A tuning fork X produces 4 beats/sec with a tuning fork Y of frequency 384 Hz. When the prongs of X are slightly filed, 3 beats/sec are heard. What is the original frequency of X? Show Answer

Q118) Two tuning forks of frequencies 256 Hz and 258 Hz are sounded together. Then the time interval between two consecutive maxima heard by an observer is Show Answer

Q119) Two tuning forks of frequencies 320 Hz and 330 Hz, produce sound waves in air. What is the velocity of sound in air if the wavelengths of sound waves differ by 3.22 cm? Show Answer

Q120) Two wires A and B are vibrating with the same fundamental frequency. Following quantities associated with wire A are changed. Change in which one of these quantities will not produce beats between A and B? Show Answer

Q121) A number of tuning forks are arranged in the order of increasing frequencies and any two successive tuning forks produce 4 beats / second, when sounded together. If the frequency of the last tuning fork is the octave of the first tuning fork and if the frequency of the first tuning fork is 256 Hz, then the number of tuning forks is Show Answer

Q122) Sound waves produced by two vibrators have the same wavelength in two different gases. The speeds of the waves in the two gases are 420 m/s and 400 m/s. The vibrators, when sounded together produce 8 beats/second. The wavelength in the two gases will be Show Answer

Q123) A set of tuning forks is arranged in ascending order of frequencies. Each tuning fork gives 5 beats per second with the preceding one. If the frequency of the first tuning it fork is 100 Hz and that of last fork is 150 Hz, the total number of tuning forks arranged is Show Answer

Q124) The frequencies of tuning forks A and B are respectively 5% more and 3% less than the frequency of tuning fork C. When A and B are sounded together 8 beats/second are heard. Then the frequency of the turning fork B will be Show Answer

Q125) When two tuning forks A and B are sounded together x beats/second are heard. If one of the prongs of the tuning fork B is loaded with a little wax, the number of beats is decreased. If the frequency of A is n Hz, then the frequency of B will be Show Answer

Q126) The frequency of a fork A is 3% more than the frequency (n) of a standard fork. The frequency of fork B is 3% less than the frequency of the standard fork. If A and B produce 6 beats/sec, then the frequency of the standard fork will be Show Answer

Q127) A tuning fork of frequency 480 Hz produces 10 beats per second when sounded with a vibrating sonometer string. What is the frequency of the string if a slight increase in its tension produces lesser beats per second than before? Show Answer

Q128) Two tuning forks of frequencies 100 Hz and 95 Hz are sounded together. The time interval between two consecutive minima in the resultant sound is Show Answer

Q129) A set of 20 tuning forks is arranged in a series of increasing frequencies. Each tuning fork gives 4 beats per second with the preceding one. How many produced between consecutive odd numbered tuning forks? Show Answer

Q130) A tuning fork arrangement (pair) produces 4 beats/sec with one fork of frequency 288 Hz. A little wax is placed on the unknown fork and it then produces 2 beats/sec. What is the frequency of the unknown fork? Show Answer

Q131) Tuning fork A of frequency 305 Hz produces 5 beats/sec with another fork B. After filing the tuning fork B, it produces 3 beats/sec with A. What was the frequency of the fork B before filling? Show Answer

Q132) In the production of beats by 2 sound waves of the same amplitude and nearly the same frequency, the ratio of the maximum intensity of the resultant wave to the intensity of any one of the constituent wave is Show Answer

Q133) Two tuning forks A and B give 4 beats/second, when sounded together. If the fork B is loaded with wax, 6 beats/ second are heard. If the frequency of A is 320 Hz, the original frequency of the tuning fork B is Show Answer

Q134) A source of sound gives 5 beats per second, when sounded with another source, of frequency 100 Hz. The second harmonic of the source, together with a source of frequency 205 Hz gives 5 beats per second. What is the frequency of the source? Show Answer

Q135) When a longitudinal wave is incident at the boundary of a denser medium, then Show Answer

Q136) When a transverse wave on a string is reflected from the free end, the phase change produced is Show Answer

Q137) Let the velocity of a sound wave be v and omega be the angular velocity. The propagation constant of the wave is Show Answer

Q138) If sound waves are reflected from the surface of a denser medium, there is phase change of Show Answer