Practice Test

Q1) The waves which can propagate through metals are Show Answer

Q2) Velocity of sound is maximum in Show Answer

Q3) While playing a violin, vibrations occur in Show Answer

Q4) The velocity of sound is minimum in Show Answer

Q5) The phenomenon of interference of sound can be demonstrated by Show Answer

Q6) The persistence of hearing for human beings is not more than Show Answer

Q7) The waves in which nodes and antinodes are formed at fixed points, is called Show Answer

Q8) Two waves of the same frequency travelling in the same medium in opposite directions when superimposed give rise to Show Answer

Q9) If one of the prongs of a tuning fork is broken, the intensity of sound produced by it Show Answer

Q10) In a vibrating tuning fork, the vibrations of its two prongs are Show Answer

Q11) A medium in which all periodic waves travel with the same speed, irrespective of their wavelengths, is called a Show Answer

Q12) For the same length of open and closed pipes, the fundamental frequency in open pipe is ___ the fundamental frequency in closed pipe. Show Answer

Q13) 'Sweetness' of sound depends upon its Show Answer

Q14) Of the following, the one which emits sound of the highest pitch is Show Answer

Q15) The walls of an auditorium should Show Answer

Q16) The sound energy is converted into electrical energy by a Show Answer

Q17) The law used to determine the apparent change in frequency when a source and an observer are in relative motion is Show Answer

Q18) A decibel is Show Answer

Q19) The quality of a sound depends upon its Show Answer

Q20) The loudness of a sound depends upon its Show Answer

Q21) If the distance between the source and the observer is doubled, the intensity of sound becomes Show Answer

Q22) Pitch of related to Show Answer

Q23) For constructive interference, the phase difference between the two waves should be Show Answer

Q24) In a sonometer, the relation between the frequency (n) and the diameter (d) of the string is Show Answer

Q25) Which of the two sets of quantities below are related to each other ? Show Answer

Q26) The ratio of the velocities of sound in hydrogen and oxygen is ( under similar conditions) Show Answer

Q27) Echoes happen due to Show Answer

Q28) When a vibrating body causes another to vibrate with maximum amplitude, the two are Show Answer

Q29) A particle executes S.H.M. with an amplitude of 2 cm and makes 150 vibrations per minute. Its maximum velocity is Show Answer

Q30) If two vibrating systems are executing sympathetic vibrations, they are said to be in resonance if they have the same Show Answer

Q31) What is the relation between the frequency of an open and a closed organ pipe of the same length ? Show Answer

Q32) A tuning fork and a siren produce 18 beats in 3 sec. The frequency of the siren is 256 Hz which decreases with a decrease in the speed of siren. Then the frequency of the tuning fork is Show Answer

Q33) String B has twice the length twice the diameter, twice the tension and twice the density of string A. What overtone of B agrees in frequency with the fundamental frequency of A ? Show Answer

Q34) Mach number is defined as Show Answer

Q35) When sound waves travel from air to water, which of the following quantities remains unchanged ? Show Answer

Q36) The equation of a simple harmonic wave of amplitude 5 units and time period 0.5 s is Show Answer

Q37) A plane progressive wave is represented as
y = 0.5 sin ( 314 t - 12.5 x)
where y and x are in metres and t is in seconds.
The wavelength of the wave is Show Answer

Q38) Assertion :
Two persons cannot talk to each other on the surface of moon.
Reason :
There is no atmosphere on the moon. Show Answer

Q39) Assertion :
Sound travels faster on a rainy day than on a dry day.
Reason :
Moisture in the air increases the pressure. Show Answer

Q40) Assertion :
Longitudinal waves cannot be polarised.
Reason :
Transverse waves can be polarized. Show Answer

Q41) Assertion :
Longitudinal waves travel through a medium in the form of compressions and rarefaction involving changes in pressure and volume.
Reason :
Sound waves in air are longitudinal. Show Answer

Q42) Assertion :
Sound waves in air cannot be polarized.
Reason :
Sound waves in air are longitudinal. Show Answer

Q43) Musical instruments are based on the phenomenon of Show Answer

Q44) Wind Instruments Show Answer

Q45) Xylophones consist of Show Answer

Q46) Musical sound consists of Show Answer

Q47) In a harmonium, Show Answer

Q48) Voice box is called Show Answer

Q49) High quality musical instruments have Show Answer

Q50) In percussion instrument Show Answer

Q51) Most of the musical instruments Show Answer

Q52) Shortening the length of guitar Show Answer

Q53) Electronic Instruments Show Answer

Q54) Xylophone is a Show Answer

Q55) Loudness of 80 dB Show Answer

Q56) Pitch is a measure of Show Answer

Q57) Piano is a Show Answer

Q58) On changing the position of fingers on a flute Show Answer

Q59) With an increase in temperature, the frequency of an organ pipe Show Answer

Q60) Thickwire in the Sitar Show Answer

Q61) In a sonometer, the tension in the wire was varied for different resonating lengths. Which of the graphs in this figure correctly represents this ? Show Answer

Q62) Which of the figures represents the variation of intensity of sound at a point in an auditorium with time ? Show Answer

Q63) Which of the figures depicts variation of amplitude (A) with the frequency (n) of the vibrating body ? Show Answer

Q64) Which of the following vibration is damped ? Show Answer

Q65) In an experiment using a sonometer, which of the following graphs correctly represents the variation between the resonating length (l) and diameter (D), other parameters being fixed ? Show Answer

Q66) The quality of a musical note depends upon its Show Answer

Q67) ASSERTION (A) :
When sitar is plucked, we hear a musical note.
REASON (R) :
Air transmits, transverse mechanical waves. Show Answer

Q68) The three lowest frequencies for standing waves on the wire of a musical instrument 9.88 m long and having mass 0.107 kg stretched under the tension of 236 N, are Show Answer

Q69) The velocity of sound in air and water are 336 m/s and 1470 m/s respectively. Two sources producing waves of wavelength 6 m and 7 m sounded together will produce beats that can Show Answer

Q70) A similar note played on two different instruments like sitar and flute can be distinguishes on the basis of its Show Answer

Q71) ASSERTION (A) :
The velocity of sound is generally greater in solids than in gases.
REASON (R) :
The elasticity of solid is very high. Show Answer

Q72) The pitch of sound depends upon Show Answer

Q73) Sound travels in gases in the form of Show Answer

Q74) The sound waves passing through air have their wavelengths in the ratio 4:5. Their frequencies are in the ratio Show Answer

Q75) The ratio of the frequencies of the fundamental notes between one organ pipe open at both ends and another organ pipe of same length closed at one end is Show Answer

Q76) There are two identical organ pipes with same length and same diameter. One is closed of one end while the other is open at both the ends. The quality of sound is superior in the open-ended pipe due to the Show Answer

Q77) The approximate intensity level of the sound which can cause damage to the ear drum is Show Answer

Q78) When a wire of a sitar is plucked, the waves produced in air will be Show Answer

Q79) A note has a wavelength of 0.5 m in air. A note two octave below it under the same conditions has a wavelength Show Answer

Q80) Sound waves travel fastest in Show Answer

Q81) The frequency of the tuning fork A is slightly higher than that of tuning fork B. By sounding them together beats can be produced. if the fork B is loaded with wax, the frequency of beats will Show Answer

Q82) To produce sound it is necessary that Show Answer

Q83) A given tube is open at both the ends. The shortest length of a column of air that would vibrate at 331 Hz in such a tube is (the velocity of sound is 331 m/s) Show Answer

Q84) Which of the following features distinguish musical sounds from noise ?
(I) Regularity in sound
(II) A musical sound has a single frequency.
(III) Absence of sudden changes of amplitude in respect of musical sounds.
Select the correct answer by using the codes given below : Show Answer

Q85) A boy produces a certain note when he blows gently into an organ pipe. If he blows into the pipe,harder the most portable change will be that the sound wave Show Answer

Q86) Which of the following phenomena are exhibited by sound waves ?
(I) Reflection
(II) Refraction
(III) Interference
(IV) Polarisation
(V) Diffraction
Choose the correct answer from the codes given below : Show Answer

Q87) ASSERTION (A) :
Velocity of sound in air is independent of the pressure of air.
REASON (R) :
When pressure changes, density of air changes in such a way that the ratio of pressure and density remains unchanged. Show Answer

Q88) The quality sounds differently even at the same frequency of the different musical instruments. This is due mainly to Show Answer

Q89) The fork A of frequency 100 is sounded with another tuning fork B. The number of beats produced is 2. On putting some wax on the prongs of B, the number of beats reduces to 1. The frequency of the fork B is Show Answer

Q90) A sonometer string and a tuning fork are sounded together, they produce 6 beats/s. When the length of string is either 95 cm or 100 cm, the frequency of the tuning fork is Show Answer

Q91) There are two string of equal length and diameter but the densities are in the ratio 1:2, they are stretched by a tension T. The ratio of frequencies will be Show Answer

Q92) The ratio of the fundamental frequency of an open and closed organ pipe of same length is Show Answer

Q93) 56 tuning forks are so arranged in series that each fork gives 4 beat/s with the previous one. The frequency of the last fork is 3 times that of the first. The frequency of the first fork is Show Answer

Q94) The pitch of an organ pipe is highest when the pipe is filled with Show Answer

Q95) Sweetness of the sound depends upon Show Answer

Q96) A fork A has frequency 2% more than frequency of standard fork and B has a frequency 3% less than the frequency of the same standard fork. The forks A and B produce 6 beat/s. The frequency of the fork A is Show Answer

Q97) An electric bulb illuminates plane surface. The intensity of illumination on the surface at a point 2 m away from the bulb makes an angles 60^o with normal to the surface. The intensity of bulb in candle power is Show Answer

Q98) The fundamental frequency of an open pipe is n. Keeping the pipe vertical, it is submerged in water so that half of its length is filled with water. The fundamental frequency of the air column is Show Answer

Q99) The wavelength of light received from a galaxy is 4% greater than that received from an identical source on the earth. The velocity of the galaxy relative to the earth is Show Answer

Q100) The apparent frequency noted by a moving listener away from the stationary source is 10% less than the real frequency. if the velocity of sound is 330 m/s, then the velocity of the listener is Show Answer

Q101) Two train moves towards each other with the same speed. The velocity of sound is 335 m/s. If the height of the tone of the whistle of one of them heard on the other changes 9/8 times, then their speed should be Show Answer

Q102) If the frequency of a note emitted by a source changes by 20% as it approaches an observer and then recedes away from him, the speed of the source is nearly Show Answer

Q103) At what speed a source must move towards a stationary observer so that the apparent frequency may be double the true frequency of the source ? Show Answer

Q104) The intensity of a sound gets reduced by 20% on passing through a slab. The reduction in intensity of passage through two consecutive similar slabs is Show Answer

Q105) One can hear and recognise the voice of a person behind the wall, on account of Show Answer

Q106) Transverse waves are generated in two uniform steel wires A and B by attaching their free end to a vibrating source of frequency 500 Hz. The diameter of the wire A is half that of the wire B. What is the ratio of the velocity of the waves in the wires A and B ? Show Answer

Q107) Which one among the following is not produced by sound waves in air ? Show Answer

Q108) Ultrasonic waves are those sound waves having frequency Show Answer

Q109) A jet plane flies through air with a velocity of 2 Mach. While the velocity of sound is 332 m/s, the air speed of the plane is Show Answer

Q110) Which one among the following statements is not correct ? Show Answer

Q111) Bats can ascertain distances, nature and size of the obstacles at night. This is possible by reflection of the emitted Show Answer

Q112) Sound moves with higher velocity if Show Answer

Q113) Pitch is a characteristic of sound that depends upon its Show Answer

Q114) The audible frequency range of a human ear is Show Answer

Q115) A sonometer wire having a length of 50 cm is vibrating in the fundamental mode with a frequency of 100 Hz. Which of the following is the type of propagating wave and its speed ? Show Answer