JEE Main & Advanced Physics Wave Mechanics Question Bank

done Basics of Mechanical Waves Total Questions - 94

• question_answer1)
  Which of the following statements is wrong                                                        [NCERT 1976, 79]
  A)
             Sound travels in straight line done clear
  B)
             Sound is a form of energy done clear
  C)
             Sound travels in the form of waves done clear
  D)
             Sound travels faster in vacuum than in air done clear
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• question_answer2)
  The relation between frequency ?n? wavelength ?l? and velocity of propagation ?v? of wave is [EAMCET 1979; CPMT 1976, 85]
  A)
             \[n=v\lambda \]                  done clear
  B)
             \[n=\lambda /v\] done clear
  C)
             \[n=v/\lambda \]                done clear
  D)
             \[n=1/v\] done clear
  View Solution play_arrow

• question_answer3)
  Ultrasonic, Infrasonic and audible waves travel through a medium with speeds \[{{V}_{u}},\,{{V}_{i}}\] and \[{{V}_{a}}\] respectively, then [CPMT 1989]
  A)
             \[{{V}_{u}},\,{{V}_{i}}\] and \[{{V}_{a}}\] are nearly equal done clear
  B)
             \[{{V}_{u}}\ge {{V}_{a}}\ge {{V}_{i}}\] done clear
  C)
             \[{{V}_{u}}\le {{V}_{a}}\le {{V}_{i}}\]  done clear
  D)
             \[{{V}_{a}}\le {{V}_{u}}\] and \[{{V}_{u}}\approx {{V}_{i}}\] done clear
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• question_answer4)
  The distance between two consecutive crests in a wave train produced in a string is 5 cm. If 2 complete waves pass through any point per second, the velocity of the wave is [CPMT 1990]
  A)
             10 cm/sec                               done clear
  B)
             2.5 cm/sec done clear
  C)
             5 cm/sec                                 done clear
  D)
             15 cm/sec done clear
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• question_answer5)
   A tuning fork makes 256 vibrations per second in air. When the velocity of sound is 330 m/s, then wavelength of the tone emitted is                               [KCET 1994; AFMC 1998;  MH CET 1999; CBSE PMT 1999]
  A)
             0.56 m                                      done clear
  B)
             0.89 m done clear
  C)
             1.11 m                                      done clear
  D)
             1.29 m done clear
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• question_answer6)
  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)                                                        [MP PET 1991]
  A)
             3 seconds fast                      done clear
  B)
             3 seconds slow done clear
  C)
             6 seconds fast                      done clear
  D)
             6 seconds slow done clear
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• question_answer7)
  When a sound wave of frequency 300 Hz passes through a medium the maximum displacement of a particle of the medium is 0.1 cm. The maximum velocity of the particle is equal to          [MNR 1992; UPSEAT 1998, 2000; RPMT 2002; Pb. PET 2004]
  A)
             60 p cm/sec                           done clear
  B)
             30 p cm/sec done clear
  C)
             30 cm/sec                               done clear
  D)
             60 cm/sec done clear
  View Solution play_arrow

• question_answer8)
  Sound waves have the following frequencies that  are audible to human beings                                                [CPMT 1975]
  A)
             5 c/s                                          done clear
  B)
             27000 c/s done clear
  C)
             5000 c/s                                   done clear
  D)
             50,000 c/s done clear
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• question_answer9)
  Velocity of sound waves in air is 330 m/sec. For a particular sound in air, a path difference of 40 cm is equivalent to a phase difference of 1.6p. The frequency of this wave is [CBSE PMT 1990]
  A)
             165 Hz                                      done clear
  B)
             150 Hz done clear
  C)
             660 Hz                                      done clear
  D)
             330 Hz done clear
  View Solution play_arrow

• question_answer10)
  The wavelength of ultrasonic waves in air is of the order of [EAMCET 1989]
  A)
             \[5\times {{10}^{-5}}\,cm\]    done clear
  B)
             \[5\times {{10}^{-8}}\,cm\] done clear
  C)
             \[5\times {{10}^{5}}\,cm\]      done clear
  D)
             \[5\times {{10}^{8}}\,cm\] done clear
  View Solution play_arrow

• question_answer11)
  The relation between phase difference (Df) and path difference (Dx) is               [MNR 1995; UPSEAT 1999, 2000]
  A)
             \[\Delta \varphi =\frac{2\pi }{\lambda }\Delta x\]    done clear
  B)
             \[\Delta \varphi =2\pi \lambda \Delta x\] done clear
  C)
             \[\Delta \varphi =\frac{2\pi \lambda }{\Delta x}\]    done clear
  D)
             \[\Delta \varphi =\frac{2\Delta x}{\lambda }\] done clear
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• question_answer12)
  A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2 MHz\[.\] The speed of sound in a tissue is 1.7 km-s?1. The wavelength of sound in the tissue is close to [CBSE PMT 1995]
  A)
             \[4\times {{10}^{-4}}\,m\]      done clear
  B)
             \[8\times {{10}^{-3}}\,m\] done clear
  C)
             \[4\times {{10}^{-3}}\,m\]      done clear
  D)
             \[8\times {{10}^{-4}}\,m\] done clear
  View Solution play_arrow

• question_answer13)
  The minimum audible wavelength at room temperature is about                                              [AFMC 1996]
  A)
             0.2 Å                                         done clear
  B)
             5 Å done clear
  C)
             5 cm to 2 metre                    done clear
  D)
             20 mm done clear
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• question_answer14)
  The ratio of the speed of sound in nitrogen gas to that in helium gas, at 300 K is                                 [IIT 1999]
  A)
             \[\sqrt{2/7}\]                        done clear
  B)
             \[\sqrt{1/7}\] done clear
  C)
             \[\sqrt{3}/5\]                        done clear
  D)
             \[\sqrt{6}/5\] done clear
  View Solution play_arrow

• question_answer15)
  In a sinusoidal wave, the time required for a particular point to move from maximum displacement to zero displacement is 0.170 second. The frequency of the wave is        [CBSE PMT 1998; AIIMS 2001;  AFMC 2002; CPMT 2004]
  A)
             1.47 Hz                                     done clear
  B)
             0.36 Hz done clear
  C)
             0.73 Hz                                     done clear
  D)
             2.94 Hz done clear
  View Solution play_arrow

• question_answer16)
  The number of waves contained in unit length of the medium is called                                   [AIIMS 1998]
  A)
             Elastic wave                           done clear
  B)
             Wave number done clear
  C)
             Wave pulse                           done clear
  D)
             Electromagnetic wave done clear
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• question_answer17)
  The frequency of a rod is 200 Hz. If the velocity of sound in air is \[340\,m{{s}^{-1}}\], the wavelength of the sound produced is [EAMCET (Med.) 1995;  Pb. PMT 1999; CPMT 2000]
  A)
             1.7 cm                                      done clear
  B)
             6.8 cm done clear
  C)
             1.7 m                                        done clear
  D)
             6.8 m done clear
  View Solution play_arrow

• question_answer18)
   Frequency range of the audible sounds is [EAMCET (Med.) 1995; RPMT 1997]
  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
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• question_answer19)
  In a medium sound travels 2 km in 3 sec and in air, it travels 3 km in 10 sec. The ratio of the wavelengths of sound in the two media is                                                             [NTSE 1995]
  A)
             1 : 8                                           done clear
  B)
             1 : 18 done clear
  C)
             8 : 1                                           done clear
  D)
             20 : 9 done clear
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• question_answer20)
  A stone is dropped into a lake from a tower 500 metre high. The sound of the splash will be heard by the man approximately after [CPMT 1992; JIPMER 2001, 02;  Kerala PMT 2005]
  A)
             11.5 seconds                         done clear
  B)
             21 seconds done clear
  C)
             10 seconds                             done clear
  D)
             14 seconds done clear
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• question_answer21)
  When sound waves travel from air to water, which of the following remains constant [AFMC 1993; DCE 1999; CPMT 2004]
  A)
             Velocity                                   done clear
  B)
             Frequency done clear
  C)
             Wavelength                          done clear
  D)
             All the above done clear
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• question_answer22)
  A stone is dropped in a well which is 19.6m deep. Echo sound is heard after 2.06 sec (after dropping) then the velocity of sound is                                                                       [RPMT 1999]
  A)
             332.6 m/sec                           done clear
  B)
             326.7 m/sec done clear
  C)
             300.4 m/sec                           done clear
  D)
             290.5 m/sec done clear
  View Solution play_arrow

• question_answer23)
  At what temperature velocity of sound is double than that of at 0°C                                        [RPMT 1999]
  A)
             819 K                                        done clear
  B)
             819°C done clear
  C)
             600°C                                        done clear
  D)
             600 K done clear
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• question_answer24)
  Velocity of sound is maximum in  [AFMC 1998; BCECE 2001; RPMT 1999, 02]
  A)
             Air  done clear
  B)
             Water done clear
  C)
             Vacuum                                  done clear
  D)
             Steel done clear
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• question_answer25)
  If velocity of sound in a gas is 360 m/s and the distance between a compression and the nearest rarefaction is 1m, then the frequency of sound is                                [KCET 1999]
  A)
             90 Hz                                        done clear
  B)
             180 Hz done clear
  C)
             360 Hz                                      done clear
  D)
             720 Hz done clear
  View Solution play_arrow

• question_answer26)
  If the density of oxygen is 16 times that of hydrogen, what will be the ratio of their corresponding velocities of sound waves      [KCET 1999]
  A)
             1 : 4                                           done clear
  B)
             4 : 1 done clear
  C)
             16 : 1                                         done clear
  D)
             1 : 16 done clear
  View Solution play_arrow

• question_answer27)
  At which temperature the speed of sound in hydrogen will be same as that of speed of sound in oxygen at 100oC [UPSEAT 1999]
  A)
             ? 148oC                                    done clear
  B)
             ? 212.5oC done clear
  C)
             ? 317.5oC                                done clear
  D)
             ? 249.7oC done clear
  View Solution play_arrow

• question_answer28)
  A tuning fork produces waves in a medium. If the temperature of the medium changes, then which of the following will change        [EAMCET (Med.) 1998;  Pb. PMT 1999; MH CET 2001]
  A)
             Amplitude                              done clear
  B)
             Frequency done clear
  C)
             Wavelength                          done clear
  D)
             Time-period done clear
  View Solution play_arrow

• question_answer29)
  The wave length of light in visible part \[({{\lambda }_{V}})\] and for sound \[({{\lambda }_{S}})\] are related as                                                                          [RPMT 1999]
  A)
             \[{{\lambda }_{V}}>{{\lambda }_{S}}\]                          done clear
  B)
             \[{{\lambda }_{S}}>{{\lambda }_{V}}\] done clear
  C)
             \[{{\lambda }_{S}}={{\lambda }_{V}}\]                          done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer30)
  Which of the following is different from others [AFMC 1994; CPMT 1999; Pb. PMT 2004]
  A)
             Velocity                                   done clear
  B)
             Wavelength done clear
  C)
             Frequency                             done clear
  D)
             Amplitude done clear
  View Solution play_arrow

• question_answer31)
  The phase difference between two points separated by 1m in a wave of frequency 120 Hz is \[{{90}^{o}}\]. The wave velocity is [KCET 1999]
  A)
             180 m/s                                   done clear
  B)
             240 m/s done clear
  C)
             480 m/s                                   done clear
  D)
             720 m/s done clear
  View Solution play_arrow

• question_answer32)
  The echo of a gunshot is heard 8 sec. after the gun is fired. How far from him is the surface that reflects the sound (velocity of sound in air = 350 m/s) [JIPMER 1999]
  A)
             1400 m                                     done clear
  B)
             2800 m done clear
  C)
             700 m                                       done clear
  D)
             350 m done clear
  View Solution play_arrow

• question_answer33)
  A man sets his watch by the sound of a siren placed at a distance 1 km away. If the velocity of sound is 330 m/s [JIPMER 1999]
  A)
             His watch is set 3 sec. faster done clear
  B)
             His watch is set 3 sec. slower done clear
  C)
             His watch is set correctly done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer34)
  Velocity of sound in air is  [Pb. PMT 1999; UPSEAT 2000]
  A)
             Faster in dry air than in moist air done clear
  B)
             Directly proportional to pressure done clear
  C)
             Directly proportional to temperature done clear
  D)
             Independent of pressure of air  done clear
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• question_answer35)
  Two monoatomic ideal gases 1 and 2 of molecular masses m1 and m2 respectively are enclosed in separate containers kept at the same temperature. The ratio of the speed of sound in gas 1 to that in gas 2 is given by   [IIT-JEE Screening 2000]
  A)
             \[\sqrt{\frac{{{m}_{1}}}{{{m}_{2}}}}\]                            done clear
  B)
             \[\sqrt{\frac{{{m}_{2}}}{{{m}_{1}}}}\] done clear
  C)
             \[\frac{{{m}_{1}}}{{{m}_{2}}}\]                                         done clear
  D)
             \[\frac{{{m}_{2}}}{{{m}_{1}}}\] done clear
  View Solution play_arrow

• question_answer36)
  A man is standing between two parallel cliffs and fires a gun. If he hears first and second echoes after 1.5 s and 3.5s respectively, the distance between the cliffs is (Velocity of sound in air = 340 ms?1) [EAMCET (Med.) 2000]
  A)
             1190 m                                     done clear
  B)
             850 m done clear
  C)
             595 m                                       done clear
  D)
             510 m done clear
  View Solution play_arrow

• question_answer37)
  When the temperature of an ideal gas is increased by 600 K, the velocity of sound in the gas becomes \[\sqrt{3}\] times the initial velocity in it. The initial temperature of the gas is [EAMCET (Med.) 2000]
  A)
             \[-{{73}^{o}}C\]                   done clear
  B)
             \[{{27}^{o}}C\] done clear
  C)
             \[{{127}^{o}}C\]                   done clear
  D)
             \[{{327}^{o}}C\] done clear
  View Solution play_arrow

• question_answer38)
  The frequency of a sound wave is n and its velocity is v. If the frequency is increased to \[4n,\] the velocity of the wave will be                                                         [MP PET 2000]
  A)
             v     done clear
  B)
             \[2v\] done clear
  C)
             \[4v\]                                       done clear
  D)
             \[v/4\] done clear
  View Solution play_arrow

• question_answer39)
  The temperature at which the speed of sound in air becomes double of its value at \[{{27}^{o}}C\] is [CPMT 1997; UPSEAT 2000; DPMT 2003]
  A)
             \[{{54}^{o}}C\]                     done clear
  B)
             \[{{327}^{o}}C\] done clear
  C)
             \[{{927}^{o}}C\]                   done clear
  D)
             \[-{{123}^{o}}C\] done clear
  View Solution play_arrow

• question_answer40)
  The speed of a wave in a certain medium is 960 m/s. If 3600 waves pass over a certain point of the medium in 1 minute, the wavelength is                                                     [MP PMT 2000]
  A)
             2 metres                                  done clear
  B)
             4 metres done clear
  C)
             8 metres                                  done clear
  D)
             16 metres done clear
  View Solution play_arrow

• question_answer41)
  Speed of sound at constant temperature depends on  [RPET 2000; AIIMS 1998]
  A)
             Pressure                                 done clear
  B)
             Density of gas done clear
  C)
             Above both                           done clear
  D)
             None of the above done clear
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• question_answer42)
  A man standing on a cliff claps his hand hears its echo after 1 sec. If sound is reflected from another mountain and velocity of sound in air is 340 m/sec. Then the distance between the man and reflection point is                [RPET 2000]
  A)
             680 m                                       done clear
  B)
             340 m done clear
  C)
             85 m                                         done clear
  D)
             170 m done clear
  View Solution play_arrow

• question_answer43)
  What will be the wave velocity, if the radar gives 54 waves per min and wavelength of the given wave is 10 m                                                                                                [RPET 2000]
  A)
             4 m/sec                                   done clear
  B)
             6 m/sec done clear
  C)
             9 m/sec                                   done clear
  D)
             5 m/sec done clear
  View Solution play_arrow

• question_answer44)
  Sound velocity is maximum in [Pb. CET 2000; RPMT 2000]
  A)
             \[{{H}_{2}}\]                          done clear
  B)
             \[{{N}_{2}}\] done clear
  C)
             \[He\]                                      done clear
  D)
             \[{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer45)
  The minimum distance of reflector surface from the source for listening the echo of sound is [CPMT 1997; RPMT 1999; KCET 2000]
  A)
             28 m                                         done clear
  B)
             18 m done clear
  C)
             19 m                                         done clear
  D)
             16.5 m done clear
  View Solution play_arrow

• question_answer46)
  The type of waves that can be propagated through solid is  [CPMT 2000]
  A)
             Transverse                             done clear
  B)
             Longitudinal done clear
  C)
             Both (a) and (b)                   done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer47)
  A man stands in front of a hillock and fires a gun. He hears an echo after 1.5 sec. The distance of the hillock from the man is (velocity of sound in air is 330 m/s) [EAMCET (Eng.) 1998; CPMT 2000]
  A)
             220 m                                       done clear
  B)
             247.5 m done clear
  C)
             268.5 m                                   done clear
  D)
             292.5 m done clear
  View Solution play_arrow

• question_answer48)
  Velocity of sound in air I.         Increases with temperature II.       Decreases with temperature III.      Increase with pressure IV.      Is independent of pressure V.       Is independent of temperature Choose the correct answer.                          [Kerala (Engg.) 2001]
  A)
             Only I and II are true          done clear
  B)
             Only I and III are true done clear
  C)
             Only II and III are true       done clear
  D)
             Only I and IV are true done clear
  View Solution play_arrow

• question_answer49)
  The speed of a wave in a medium is 760 m/s. If 3600 waves are passing through a point, in the medium in 2 minutes, then its wavelength is                             [AFMC 1998; CPMT 2001]
  A)
             13.8 m                                      done clear
  B)
             25.3 m done clear
  C)
             41.5 m                                      done clear
  D)
             57.2 m done clear
  View Solution play_arrow

• question_answer50)
  If at same temperature and pressure, the densities for two diatomic gases are respectively \[{{d}_{1}}\] and \[{{d}_{2}}\], then the ratio of velocities of sound in these gases will be  [CPMT 2001]
  A)
             \[\sqrt{\frac{{{d}_{2}}}{{{d}_{1}}}}\]                              done clear
  B)
             \[\sqrt{\frac{{{d}_{1}}}{{{d}_{2}}}}\] done clear
  C)
             \[{{d}_{1}}{{d}_{2}}\]        done clear
  D)
             \[\sqrt{{{d}_{1}}{{d}_{2}}}\] done clear
  View Solution play_arrow

• question_answer51)
  The frequency of a tunning fork is 384 per second and velocity of sound in air is 352 m/s. How far the sound has traversed while fork completes 36 vibration  [KCET 2001]
  A)
             3 m done clear
  B)
             13 m done clear
  C)
             23 m                                         done clear
  D)
             33 m done clear
  View Solution play_arrow

• question_answer52)
  \[{{v}_{1}}\] and \[{{v}_{2}}\] are the velocities of sound at the same temperature in two monoatomic gases of densities \[{{\rho }_{1}}\] and \[{{\rho }_{2}}\] respectively. If \[{{\rho }_{1}}/{{\rho }_{2}}=\frac{1}{4}\] then the ratio of velocities \[{{v}_{1}}\] and \[{{v}_{2}}\] will be  [KCET  2000; AIIMS 2002; AFMC 2002]
  A)
             1 : 2                                           done clear
  B)
             4 : 1 done clear
  C)
             2 : 1                                           done clear
  D)
             1 : 4 done clear
  View Solution play_arrow

• question_answer53)
  The temperature at which the speed of sound in air becomes double of its value at \[{{0}^{o}}C\] is        [AIEEE 2002]
  A)
             273K                                         done clear
  B)
             546K done clear
  C)
             1092K                                       done clear
  D)
             0K done clear
  View Solution play_arrow

• question_answer54)
  If wavelength of a wave is \[\lambda =6000{AA}.\] Then wave number will be                                  [MH CET 2002]
  A)
  \[166\times {{10}^{3}}\] m?1 done clear
  B)
  \[16.6\times {{10}^{-1}}\] m?1 done clear
  C)
  \[1.66\times {{10}^{6}}\] m?1 done clear
  D)
  \[1.66\times {{10}^{7}}\] m?1 done clear
  View Solution play_arrow

• question_answer55)
  Velocity of sound measured in hydrogen and oxygen gas at a given temperature will be in the ratio [RPET 2001; UPSEAT 2001; KCET 2002, 05]
  A)
             1 : 4                                           done clear
  B)
             4 : 1 done clear
  C)
             2 : 1                                           done clear
  D)
             1 : 1 done clear
  View Solution play_arrow

• question_answer56)
  Find the frequency of minimum distance between compression & rarefaction of a wire. If the length of the wire is 1m & velocity of sound in air is 360 m/s                       [CPMT 2003]
  A)
             90 sec?1                                    done clear
  B)
             180s?1 done clear
  C)
             120 sec?1                                 done clear
  D)
             360 sec?1 done clear
  View Solution play_arrow

• question_answer57)
  The velocity of sound is vs in air. If the density of air is increased to 4 times, then the new velocity of sound will be [BHU 2003]
  A)
             \[\frac{{{v}_{s}}}{2}\]        done clear
  B)
             \[\frac{{{v}_{s}}}{12}\] done clear
  C)
             \[12{{v}_{s}}\]                      done clear
  D)
                  \[\frac{3}{2}v_{s}^{2}\] done clear
  View Solution play_arrow

• question_answer58)
  It takes 2.0 seconds for a sound wave to travel between two fixed points when the day temperature is \[{{10}^{o}}\]C. If the temperature rise to \[{{30}^{o}}\]C the sound wave travels between the same fixed parts in          [Orissa JEE 2003]
  A)
             1.9 sec                                      done clear
  B)
             2.0 sec done clear
  C)
             2.1 sec                                      done clear
  D)
             2.2 sec done clear
  View Solution play_arrow

• question_answer59)
  If vm is the velocity of sound in moist air, vd is the velocity of sound in dry  air, under identical conditions of pressure and temperature                                                      [KCET 2002, 03]
  A)
             vm > vd                                     done clear
  B)
             vm < vd done clear
  C)
             vm = vd                                     done clear
  D)
             vmvd = 1 done clear
  View Solution play_arrow

• question_answer60)
  A man, standing between two cliffs, claps his hands and starts hearing a series of echoes at intervals of one second. If the speed of sound in air is 340 ms-1, the distance between the cliffs is                                   [KCET 2004]
  A)
             340 m                                       done clear
  B)
             1620 m done clear
  C)
             680 m                                       done clear
  D)
             1700 m done clear
  View Solution play_arrow

• question_answer61)
  A source of sound of frequency 600 Hz is placed inside water. The speed of sound in water is 1500 m/s and in air is 300 m/s. The frequency of sound recorded by an observer who is standing in air is                   [IIT-JEE Screening 2004]
  A)
             200 Hz                                      done clear
  B)
             3000 Hz done clear
  C)
             120 Hz                                      done clear
  D)
             600 Hz done clear
  View Solution play_arrow

• question_answer62)
  If the temperature of the atmosphere is increased the following character of the sound wave is effected [AFMC 2004]
  A)
             Amplitude                              done clear
  B)
             Frequency done clear
  C)
             Velocity                                   done clear
  D)
             Wavelength done clear
  View Solution play_arrow

• question_answer63)
  An underwater sonar source operating at a frequency of 60 KHz directs its beam towards the surface. If the velocity of sound in air is 330 m/s, the wavelength and frequency of waves in air are:                                      [DPMT 2004]
  A)
             5.5 mm, 60 KHz                    done clear
  B)
             330 m, 60 KHz done clear
  C)
             5.5 mm, 20 KHz                    done clear
  D)
             5.5 mm, 80 KHz done clear
  View Solution play_arrow

• question_answer64)
  Two sound waves having a phase difference of 60° have path difference of         [CBSE PMT 1996; AIIMS 2001]
  A)
             2l   done clear
  B)
             l/2 done clear
  C)
             l/6 done clear
  D)
             l/3 done clear
  View Solution play_arrow

• question_answer65)
  It is possible to distinguish between the transverse and longitudinal waves by studying the property of [CPMT 1976; EAMCET 1994]
  A)
             Interference                         done clear
  B)
             Diffraction done clear
  C)
             Reflection                              done clear
  D)
             Polarisation done clear
  View Solution play_arrow

• question_answer66)
  Water waves are                                   [EAMCET 1979; AIIMS 2004]
  A)
             Longitudinal                          done clear
  B)
             Transverse done clear
  C)
             Both longitudinal and transverse done clear
  D)
             Neither longitudinal nor transverse done clear
  View Solution play_arrow

• question_answer67)
  Sound travels in rocks in the form of [NCERT 1968]
  A)
             Longitudinal elastic waves only done clear
  B)
             Transverse elastic waves only                                           done clear
  C)
             Both longitudinal and transverse elastic waves done clear
  D)
             Non-elastic waves done clear
  View Solution play_arrow

• question_answer68)
  The waves in which the particles of the medium vibrate in a direction perpendicular to the direction of wave motion is known as [EAMCT 1981; AIIMS 1998; DPMT 2000]
  A)
             Transverse wave done clear
  B)
             Longitudinal waves done clear
  C)
             Propagated waves             done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer69)
  A medium can carry a longitudinal wave because it has the property of                                  [KCET 1994]
  A)
             Mass                                        done clear
  B)
             Density done clear
  C)
             Compressibility                    done clear
  D)
             Elasticity done clear
  View Solution play_arrow

• question_answer70)
  Which of the following is the longitudinal wave [AFMC 1997]
  A)
             Sound waves                        done clear
  B)
             Waves on plucked string done clear
  C)
             Water waves                        done clear
  D)
             Light waves done clear
  View Solution play_arrow

• question_answer71)
  The nature of sound waves in gases is  [RPMT 1999; RPET 2000; J & K CET 2004]
  A)
             Transverse                             done clear
  B)
             Longitudinal done clear
  C)
             Stationary                              done clear
  D)
             Electromagnetic done clear
  View Solution play_arrow

• question_answer72)
  Transverse waves can propagate in  [CPMT 1984; KCET 2000; RPET 2001]
  A)
             Liquids                                     done clear
  B)
             Solids done clear
  C)
             Gases                                       done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer73)
  Sound waves in air are                             [RPET 2000; AFMC 2001]
  A)
             Transverse                             done clear
  B)
             Longitudinal done clear
  C)
             De-Broglie waves                done clear
  D)
             All the above done clear
  View Solution play_arrow

• question_answer74)
  Which of the following is not the transverse wave [AFMC 1999; BHU 2001]
  A)
             X-rays                                      done clear
  B)
             \[\gamma \]-rays done clear
  C)
             Visible light wave                done clear
  D)
             Sound wave in a gas done clear
  View Solution play_arrow

• question_answer75)
  What is the phase difference between two successive crests in the wave             [RPMT 2001, 02; MH CET 2004]
  A)
             p     done clear
  B)
             p/2 done clear
  C)
             2p   done clear
  D)
             4p done clear
  View Solution play_arrow

• question_answer76)
  A wave of frequency 500 Hz has velocity 360 m/sec. The distance between two nearest points 60° out of phase, is                   [NCERT 1979; MP PET 1989; JIPMER 1997;  RPMT 2002, 03; CPMT 1979, 90, 2003; BCECE 2005]
  A)
             0.6 cm                                      done clear
  B)
             12 cm done clear
  C)
             60 cm                                       done clear
  D)
             120 cm done clear
  View Solution play_arrow

• question_answer77)
  The following phenomenon cannot be observed for sound waves           [NCERT 1982; CPMT 1985, 97; AFMC 2002; RPMT 2003]
  A)
             Refraction                              done clear
  B)
             Interference done clear
  C)
             Diffraction                              done clear
  D)
             Polarisation done clear
  View Solution play_arrow

• question_answer78)
  When an aeroplane attains a speed higher than the velocity of sound in air, a loud bang is heard. This is because [NCERT 1972; J & K CET 2002]
  A)
             It explodes done clear
  B)
             It produces a shock wave which is received as the bang done clear
  C)
             Its wings vibrate so violently that the bang is heard done clear
  D)
             The normal engine noises undergo a Doppler shift to generate the bang done clear
  View Solution play_arrow

• question_answer79)
  Ultrasonic waves are those waves                         [CPMT 1979]
  A)
             To which man can hear     done clear
  B)
             Man can't hear done clear
  C)
             Are of high velocity            done clear
  D)
             Of high amplitude done clear
  View Solution play_arrow

• question_answer80)
  A big explosion on the moon cannot be heard on the earth because                       [CPMT 1972; AFMC 2005]
  A)
             The explosion produces high frequency sound waves which are inaudible done clear
  B)
             Sound waves required a material medium for propagation done clear
  C)
             Sound waves are absorbed in the moon's atmosphere done clear
  D)
             Sound waves are absorbed in the earth's atmosphere done clear
  View Solution play_arrow

• question_answer81)
  Sound waves of wavelength greater than that of audible sound are called            [KCET 1999]
  A)
             Seismic waves                      done clear
  B)
             Sonic waves done clear
  C)
             Ultrasonic waves                 done clear
  D)
             Infrasonic waves done clear
  View Solution play_arrow

• question_answer82)
  ?SONAR? emits which of the following waves [AIIMS 1999]
  A)
             Radio waves                          done clear
  B)
             Ultrasonic waves done clear
  C)
             Light waves                           done clear
  D)
             Magnetic waves done clear
  View Solution play_arrow

• question_answer83)
  Which of the following do not require medium for transmission                                [RPMT 2000]
  A)
             Cathode ray                          done clear
  B)
             Electromagnetic wave done clear
  C)
             Sound wave                          done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer84)
  Consider the following I.         Waves created on the surfaces of a water pond by a vibrating sources. II.       Wave created by an oscillating electric field in air. III.      Sound waves travelling under water. Which of these can be polarized                              [AMU 2001]
  A)
             I and II                                     done clear
  B)
             II only done clear
  C)
             II and III                                   done clear
  D)
             I, II and III done clear
  View Solution play_arrow

• question_answer85)
  Mechanical waves on the surface of a liquid are [SCRA 1996]
  A)
             Transverse done clear
  B)
             Longitudinal done clear
  C)
             Torsional done clear
  D)
             Both transverse and longitudinal done clear
  View Solution play_arrow

• question_answer86)
  The ratio of densities of nitrogen and oxygen is 14:16. The temperature at which the speed of sound in nitrogen will be same at that in oxygen at 55oC is [EAMCET (Engg.) 1999]
  A)
             35°C                                          done clear
  B)
             48°C done clear
  C)
             65°C                                          done clear
  D)
             14°C done clear
  View Solution play_arrow

• question_answer87)
  The intensity of sound increases at night due to  [CPMT 2000]
  A)
             Increase in density of air done clear
  B)
             Decreases in density of air done clear
  C)
             Low temperature               done clear
  D)
             None of these  done clear
  View Solution play_arrow

• question_answer88)
  A wavelength 0.60 cm is produced in air and it travels at a speed of 300 ms?1. It will be an              [UPSEAT 2000]
  A)
             Audible wave                       done clear
  B)
             Infrasonic wave done clear
  C)
             Ultrasonic wave                   done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer89)
  Speed of sound in mercury at a certain temperature is 1450 m/s. Given the density of mercury as 13.6  ´ 103 kg / m3, the bulk modulus for mercury is                           [JIPMER 2000]
  A)
             2.86 ´1010 N/m3                   done clear
  B)
             3.86 ´1010 N/m3 done clear
  C)
             4.86 ´1010 N/m3                   done clear
  D)
             5.86 ´1010 N/m3 done clear
  View Solution play_arrow

• question_answer90)
  A micro-wave and an ultrasonic sound wave have the same wavelength. Their frequencies are in the ratio (approximately)                                                 [Kerala (Engg.) 2002]
  A)
             106 : 1                                       done clear
  B)
             104 : 1 done clear
  C)
             102 : 1                                       done clear
  D)
             10 : 1 done clear
  View Solution play_arrow

• question_answer91)
  A point source emits sound equally in all directions in a non-absorbing medium, Two points P and Q are at distance 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
  View Solution play_arrow

• question_answer92)
  A wave has velocity u in medium P and velocity 2u in medium Q. If the wave is incident in medium P at an angle of 30° then the angle of refraction will be                  [J & K CET 2005]
  A)
             30° done clear
  B)
             45° done clear
  C)
             60° done clear
  D)
             90° done clear
  View Solution play_arrow

• question_answer93)
  An observer standing near the sea shore observes 54 waves per minute. If the wavelength of the water wave is 10m then the velocity of water wave is             [Kerala (Engg.) 2005]
  A)
             540 ms-1                                  done clear
  B)
             5.4 ms-1 done clear
  C)
             0.184 ms-1                               done clear
  D)
             9 ms-1 done clear
  View Solution play_arrow

• question_answer94)
  Ultrasonic signal sent from SONAR returns to it after reflection from a rock after a lapse of 1 sec. If the velocity of ultrasound in water is 1600 ms?1, the depth of the rock in water is                                            [JIPMER 2000]
  A)
             300 m                                       done clear
  B)
             400 m done clear
  C)
             500 m                                       done clear
  D)
             800 m done clear
  View Solution play_arrow