JEE Questions for Physics Waves Quiz 19 - MCQExams.com

Figure here shows an incident pulse P reflected from a rigid support. Which one of A, B, C, D represents the reflected pulse correctly?
Physics-Waves-97235.png

  • Physics-Waves-97236.png
  • 2)
    Physics-Waves-97237.png

  • Physics-Waves-97238.png

  • Physics-Waves-97239.png

Physics-Waves-97240.png
  • A
  • B
  • C
  • D
The correct graph between the frequency n and square root of density (ρ) of a wire, keeping its length, radius and tension constant, is
Physics-Waves-97241.png

  • Physics-Waves-97242.png
  • 2)
    Physics-Waves-97243.png

  • Physics-Waves-97244.png

  • Physics-Waves-97245.png
A sound source emits sound waves in a uniform medium. If energy density is E and maximum speed of the particles of the medium is vmax.The plot between E and vmax is best represented by

  • Physics-Waves-97246.png
  • 2)
    Physics-Waves-97247.png

  • Physics-Waves-97248.png

  • Physics-Waves-97249.png
If the speed of the wave shown in the figure is 330m/s in the given medium, then the equation of the wave propagating in the positive x-direction will be (all quantities are in M.K.S. units
Physics-Waves-97250.png

  • Physics-Waves-97251.png
  • 2)
    Physics-Waves-97252.png

  • Physics-Waves-97253.png

  • Physics-Waves-97254.png
Two pulses travel in mutually opposite directions in a string with a speed of 2.5 cm/s as shown in the figure. Initially the pulses are 10 cm apart. What will be the state of the string after two seconds?

  • Physics-Waves-97255.png
  • 2)
    Physics-Waves-97256.png

  • Physics-Waves-97257.png

  • Physics-Waves-97258.png
Two timing forks P and Q are vibrated together. The number of beats produced are represented by the straight line OA in the following graph. After loading Q with wax again these arc vibrated together and the beats produced are represented by the line OB. If the frequency of P is 34 1Hz, the frequency of Q will be
Physics-Waves-97259.png
  • 341 Hz
  • 338 Hz
  • 344 Hz
  • None of the above
A wave is travelling along a string. At an instant, shape of the string is as shown in fig. At this instant, point A is moving upwards. Which of the following statements is/are correct?
Physics-Waves-97264.png
  • The wave is travelling to the right
  • Displacement amplitude of the wave is equal to displacement of B at this instant
  • At this instant velocity of C is also directed upwards
  • Phase difference between A and C may be equal to π/2
The displacement-time graphs for two sound waves A and B are shown in the figure, then the ratio of their intensities IA/I B is equal to
Physics-Waves-97265.png
  • 1 : 4
  • 1 : 16
  • 1 : 2
  • 1 : 1

Physics-Waves-97266.png
  • P
  • Q
  • R
  • S
Assertion Transverse waves are not produced in liquids and gases.
ReasonLight waves are transverse waves.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Sound waves cannot propagate through vacuum but light waves can.
ReasonSound waves cannot be polarised but light waves can be polarised.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
AssertionThe change in air pressure effects the speed of sound.
Reason The speed of sound in gases is proportional to the square of pressure.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The reverberation time dependent on the shape of enclosure, position of source and observer.
Reason The unit of absorption coefficient in MKS system is metric sabine.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion When a beetle moves along the sand with in a few tens of centimeters of a sand scorpion the scorpion immediately turn towards the beetle and dashes to it.
Reason When a beetle disturbs the sand, it sends pulses along the sands surface one set of pulses is longitudinal while other set is transverse.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Transverse waves travel through air in an organ pipe.
Reason Air possesses only volume elasticity.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Sound would travel faster on a hot summer day than on a cold winter day.
Reason Velocity of sound is directly proportional to the square of its absolute temperature.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The basic of Laplace correction was that, exchange of heat between the region of compression and rarefaction in air is not possible.
Reason Air is a bad conductor of heat and velocity of sound in air is large.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The flash of lightening is seen before the sound of thunder is heard.
Reason Speed of sound is greater than speed of light.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The change in air pressure effect the speed of sound.
Reason The speed of sound in a gas is proportional to square root of pressure.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Solids can support both longitudinal and transverse waves but only longitudinal waves can propagate in gases.
ReasonFor the propagation of transverse waves, medium must also necessarily have the property of rigidity.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Under given conditions of pressure and temperature, sound travels faster in a monoatomic gas than in diatomic gas.
Reason Opposition for wave to travel is more in diatomic gas than monoatomic gas.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The speed of sound in solids is maximum though their density is large.
ReasonThe coefficient of elasticity of solid is large.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion On a rainy day sound travels slower than on a dry day.
Reason When moisture is present in air the density of air increases.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.

Physics-Waves-97267.png
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Sound produced by an open organ pipe is richer than the sound produced by a closed organ pipe.
Reason Outside air can enter the pipe from both ends, in case of open organ pipe.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion It is not possible to have interference between the waves produced by two violins.
Reason For interference of two waves the phase difference between the waves must remain constant.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Like sound, light can not propagate in vacuum.
Reason Sound is a square wave. It propagates in a medium by a virtue of damping oscillation.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion In the case of a stationary wave, a person hear a loud sound at the nodes as compared to the antinodes.
Reason In a stationary wave all the particles of the medium vibrate in phase.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Velocity of particles, while crossing mean position (in stationary waves) varies from maximum at antinodes to zero at nodes.
Reason Amplitude of vibration at antinodes is maximum and at nodes, the amplitude is zero, and all particles between two successive nodes cross the mean position together.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Where two vibrating tuning forks having frequencies 256 Hz and 512 Hz are held near each other, beats cannot be heard.
Reason The principle of superposition is valid only if the frequencies of the oscillators are nearly equal.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The fundamental frequency of an open organ pipe increases as the temperature is increased.
Reason As the temperature increases, the velocity of sound increases more rapidly than length of the pipe.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Sound travels faster in solids than gases.
Reason Solid posses greater density than gases.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.

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  • 2)
    Physics-Waves-97270.png

  • Physics-Waves-97271.png

  • Physics-Waves-97272.png
When length of a sonometer wire between the two bridges changes by a small amount (∆l), the fundamental frequency changes by (∆n), such that

  • Physics-Waves-97274.png
  • 2)
    Physics-Waves-97275.png

  • Physics-Waves-97276.png

  • Physics-Waves-97277.png
Equation for a harmonic progressive wave is given by y = A sin ( 15πt + 10px + p/where x is in meter and t is in seconds. This wave is ……….
  • Travelling along the positive x direction with a speed of 1.5 ms–1 .
  • Travelling along the negative x direction with a speed of 1.5 ms–1 .
  • Has a wavelength of 1.5 m along the – x direction.
  • Has a wavelength of 1.5 m along the positive x – direction.

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  • 2)
    Physics-Waves-97282.png

  • Physics-Waves-97283.png

  • Physics-Waves-97284.png
If the resultant of two waves having amplitude b is b, then the phase difference between the two waves is …….
  • 120o
  • 60o
  • 90o
  • 180o
The amplitude of a wave in a string is 2 cm. This wave is propagating along the x-direction with a speed of 128 m/s. Five such waves are accommodated in 4 m length of the string. The equation for this wave is …….
  • y = 0.02Sin(15.7x – 2010t ) m
  • y = 0.02Sin(15.7x + 2010t ) m
  • y = 0.02Sin(7.85x – 1005t ) m
  • y = 0.02Sin(7.85x + 1005t ) m
If two SHM’s are given by the equation y1 = 0.1 Sin(100 t + π/and y2 = 0.1 Cos πt, then the phase difference between the velocity of particle 1 and 2 is ………
  • π/6
  • –π/3
  • π/3
  • –π/6
A wave y = a Sin(ωt – kx ) on a string meets with another wave producing a node at x = 0. Then the equation of the unknown wave is ………
  • y = a Sin(ωt + kx )
  • y = – a Sin(ωt + kx )
  • y = a Sin(ωt – kx )
  • y = – a Sin(ωt – kx )
An open pipe is in resonance in 2nd harmonic with frequency f1. Now one end of the tube is closed and frequency is increased to f2, such that the resonance again occurs in the nth harmonic. Choose the correct option.

  • Physics-Waves-97290.png
  • 2)
    Physics-Waves-97291.png

  • Physics-Waves-97292.png

  • Physics-Waves-97293.png
0:0:1


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