InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
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`A. His watch is set 3 sec. fasterB. His watch is set 3 sec. slowerC. His watch is set correctlyD. None of these |
| Answer» Correct Answer - B | |
| 52. |
Suppose that the speed of sound in air at a given temperature is 400 m / sec . An engine blows a whistle at 1200 H z frequency. It is approaching an observer at the speed of 100 m / sec . What is the apparent frequency as heard by the observerA. 600 HzB. 1200 HzC. 1500 HzD. 1600 Hz |
| Answer» Correct Answer - D | |
| 53. |
A whistle revolves in a circle with an angular speed of `20 rad//sec` using a string of length `50 cm`. If the frequency of sound from the whistle is `385 Hz`, then what is the minimum frequency heard by an observer which is far away from the centre in the same plane? `v=340m//s`A. 333 HzB. 374 HzC. 385 HzD. 394 Hz |
| Answer» Correct Answer - B | |
| 54. |
The difference between the apparent frequency of a sound of soun as perceived by an observer during its approach and recession is `2%` of the natural frequency of the source. If the velocity of sound in air is `300m//s`, the velocity of the source is (It is given that velocity of source `ltlt velocity of sound )A. `6 m//sec`B. `3 m//sec`C. `1.5 m//sec`D. `12m//sec` |
| Answer» Correct Answer - B | |
| 55. |
A siren emitting sound of frequency 500 Hz is going away from a static listener with a speed of 50 m / sec . The frequency of sound to be heard, directly from the siren, isA. 434.2 HzB. 589.3 HzC. 481.2 HzD. 286.5 Hz |
| Answer» Correct Answer - A | |
| 56. |
A source and an observer approach each other with same velocity 50 m/s . If the apparent frequency is `435 sec^( –1)`, then the real frequency isA. 320 sB. 360 secC. 390 secD. 420 sec |
| Answer» Correct Answer - A | |
| 57. |
Doppler effect is applicable forA. Moving bodiesB. One is moving and other are stationaryC. For relative motionD. None of these |
| Answer» Correct Answer - C | |
| 58. |
A source emits a sound of frequency of 400 Hz , but the listener hears it to be 390 Hz . ThenA. The listener is moving towards the sourceB. The source is moving towards the listenerC. The listener is moving away from the sourceD. The listener has a defective ear |
| Answer» Correct Answer - C | |
| 59. |
Two whistles Aand B produces notes of frequencies 660 Hz and 596 Hz respectively. There is a listener at the mid- point of the line joining them. Now the whistle B and the listener start moving with speed 30 m/s away from the whistle A. If speed of sound be 330 m/s, how many beats will be heard by the listenerA. 2B. 4C. 6D. 8 |
| Answer» Correct Answer - B | |
| 60. |
The fundamental note produced by a closed organ pipe is of frequency . f The fundamental note produced by an open organ pipe of same length will be of frequencyA. `(f)/(2)`B. fC. 2fD. 4f |
| Answer» Correct Answer - C | |
| 61. |
A tuning fork A of frequency 200 Hz is sounded with fork B , the number of beats per second is 5. By putting some wax on A , the number of beats increases to 8. The frequency of fork B isA. 200 HzB. 195 HzC. 192 HzD. 205 Hz |
| Answer» Correct Answer - D | |
| 62. |
A travelling wave is described by the equation `y = y_(0) sin ((ft - (x)/lambda))`. The maximum particle velocity is equal to four times the wave velocity ifA. ` lambda =(pi Y_(0))/(4)`B. `lambda =( pi Y_(0))/(2)`C. `lambda= pi Y_(0)`D. `lambda = 2 pi Y_(0)` |
| Answer» Correct Answer - B | |
| 63. |
A student determines the velocity of sound with the help of a closed organ pipe. If the observed length for fundamental frequency is 24.7 m , the length for third harmonic will beA. `74.1cm`B. `72.7 cm`C. `75.4 cm`D. `73.1 cm` |
| Answer» Correct Answer - A | |
| 64. |
The fundamental of a closed pipe is 220 Hz. If `(1)/(4)` of the pipe is filled with water, the frequency of the first overtone of the pipe now isA. 200 HzB. 440 HzC. 880 HzD. 1760 Hz |
| Answer» Correct Answer - C | |
| 65. |
Find the fundamental frequency of a closed pipe, if the length of the air column is 42 m . (speed of sound in air = 332 m/sec )A. 2 HzB. 4 HzC. 7 HzD. 9 Hz |
| Answer» Correct Answer - A | |
| 66. |
It is possible to hear beats from the two vibrating sources of frequencyA. 100 Hz and 150 HB. 20 Hz and 25 HzC. 400 Hz and 500 HzD. 1000 Hz and 1500 Hz |
| Answer» Correct Answer - B | |
| 67. |
Assertion : To hear distinct beats, difference in frequencies of two sources should be less than `10`. Reason : More the number of beats per sec more difficult to hear them.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but re ason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false |
| Answer» Correct Answer - B | |
| 68. |
Assertion : Sound produced by an open organ pipe is richer than the sound produced by pipe from both ends, in case of oper organ pipe.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but re ason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false |
| Answer» Correct Answer - B | |
| 69. |
If two waves having amplitudes 2 A and A and same frequency and velocity, propagate in the same direction in the same phase, the resulting amplitude will beA. `3A`B. `sqrt(5)A`C. `sqrt(2) A `D. A |
| Answer» Correct Answer - A | |
| 70. |
Assertion : Transverse waves travel through air in an organ pipe. Reason : Air possesses only volume elasticity.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but re ason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true |
| Answer» Correct Answer - D | |
| 71. |
Transverse waves can propagate inA. LiquidsB. SolidsC. GasesD. None of these |
| Answer» Correct Answer - B | |
| 72. |
The equation of a transverse wave is given by `y=10 sin pi (0.01 x -2t )` where x and y are in cm and t is in second. Its frequency isA. `10 sec^(-1)`B. `2 sec^(-1)`C. `1 sec ^(-1)`D. `0.01 sec ^(-1)` |
| Answer» Correct Answer - C | |
| 73. |
Fundamental frequency of sonometer wire is `n`. If the length. Tension and diameter of wire are tripled. The new findamental frequency isA. `n/(sqrt(3))`B. `n/3`C. `nsqrt(3)`D. `n/(3sqrt(3))` |
| Answer» Correct Answer - D | |
| 74. |
A spherical source of power `4 W` and frequency `800 Hz` is emitting sound waves. The intensity of waves at a distance `200 m` isA. `8xx10^(-6) W//m^(2)`B. `2xx10^(-4) W//m^(2)`C. `1x10^(-4) W//m^(2)`D. `4W//m^(2)` |
| Answer» Correct Answer - A | |
| 75. |
The equation of a wave motion (with t in seconds and x in metres ) is given by `y=7 sin [ 7 pi t-0.4 pi x+(pi)/(3)]` . The velocity of the wave will beA. `17.5 m//s`B. `49 pi m//s`C. `(40)/(2 pi) m//s`D. `(2 pi)/(49) m//s` |
| Answer» Correct Answer - A | |
| 76. |
Two waves of same frequency and intensity superimpose with each other in opposite phases, then after superposition theA. Intensity increases by 4 timesB. Intensity increases by two timesC. Varies with time as well as distanceD. None of these |
| Answer» Correct Answer - D | |
| 77. |
The displacement of a particle is given by ` x = 3 sin ( 5 pi t) + 4 cos ( 5 pi t)`. The amplitude of particle isA. 3B. 4C. 5D. 7 |
| Answer» Correct Answer - C | |
| 78. |
If the equation of transverse wave is `Y=2 sin (kx-2t),` then the maximum particle velocity isA. 4 unitsB. 2 unitsC. 0D. 6 units |
| Answer» Correct Answer - A | |
| 79. |
If the pressure amplitude in a sound wave is tripled, then by what factor the intensity of sound wave is increased?A. `9`B. `3`C. `6`D. `sqrt(3)` |
| Answer» Correct Answer - A | |
| 80. |
If the ratio of amplitude of wave is`2 : 1`, then the ratio of maximum and minimum intensity isA. ` 9 : 1`B. `1 : 9`C. `4 : 1`D. ` 1 :4` |
| Answer» Correct Answer - A | |
| 81. |
There is a destructive interference between the two waves of wavelength `lambda` coming from two different paths at a point. To get maximum sound or constructive interference at that point, the path of one wave is to be increased byA. `(lambda)/(4)`B. `(lambda)/(2)`C. `(3 lambda)/(4)`D. `lambda` |
| Answer» Correct Answer - B | |
| 82. |
Two waves represented by the following equations are travelling in the same medium `y_(1) 5sin 2 pi (75 t-0.25x),y_(2)=10 sin2 pi (150 t-o.50x)` The intensity ratio `I_(1)//I_(2)` of the two waves isA. `1 : 2`B. `1 : 4`C. `1 : 8`D. ` 1 : 16` |
| Answer» Correct Answer - B | |
| 83. |
If the ratio of amplitude of two waves is `4:3`, then the ratio of maximum and minimum intensity isA. `16 : 18`B. `18 : 16`C. `49 : 1`D. `1 : 49` |
| Answer» Correct Answer - C | |
| 84. |
The intensity ratio of two waves is `9:1`. If they produce interference, the ratio of maximum to minimum intensity will beA. `2 : 1`B. `4 : 1`C. `9 : 1`D. `10 : 8` |
| Answer» Correct Answer - B | |
| 85. |
Two waves are represented by `y_(1)= a sin (omega t + ( pi)/(6)) and y_(2) = a cos omega t `. What will be their resultant amplitudeA. aB. `sqrt(2) a `C. `sqrt(3) a`D. 2a |
| Answer» Correct Answer - C | |
| 86. |
Equation of motion in the same direction is given by `y_(1) =A sin (omega t - kx), y_(2) = A sin ( omega t - kx- theta )`. The amplitude of the medium particle will beA. `2 A cos ((theta)/(2))`B. `2A cos theta`C. ` sqrt(2) A cos ((theta)/(2))`D. ` 1.2 f, 1.2 lambda` |
| Answer» Correct Answer - A | |
| 87. |
Equation of motion in the same direction are given by ltbygt `y_(1)=2a sin (omega t-kx) and y_(2)=2a sin (omega t-kx - theta )` The amplitude of the medium particle will beA. `2 a cos theta`B. `sqrt(2a) cos theta`C. `4a cos theta//2`D. `sqrt(2a) cos theta //2` |
| Answer» Correct Answer - C | |
| 88. |
Equation of the progressive wave is given by : `y=a sin pi (40 t-x)` where a and x are in metre and t in second. The velocity of the wave isA. ` 80 m//s`B. ` 10 m//s`C. ` 40 //s`D. ` 20//s` |
| Answer» Correct Answer - C | |
| 89. |
If the equation of progressive wave is given by `y=4 sin pi[(t)/(5)-(x)/(9)+(pi)/(6)]` then, which of the following is correct `?` (Assume SI units )A. `v= 5 m // sec`B. `49 pi m//sec`C. `a=0.04 m`D. `n=50 Hz` |
| Answer» Correct Answer - B | |
| 90. |
The equation `vec(phi)(x,t)=vec(j)sin ((2pi)/(lambda)vt)cos ((2 pi)/(lambda)x)` representsA. Transverse progressive waveB. Longitudinal progressive waveC. Longitudinal stationary waveD. Transverse stationary wave |
| Answer» Correct Answer - D | |
| 91. |
Wave equations of two particles are given by `y_(1)=a sin (omega t -kx), y_(2)=a sin (kx + omega t)`, thenA. They are moving in opposite directionB. Phase between them is `90^(@)`C. Phase between them is `180^(@)`D. Phase between them is `0^(@)` |
| Answer» Correct Answer - A | |
| 92. |
A plane progressive wave is represented by the equation `y=0.1 sin (200 po t-(20 pi x)/(17))`where y is displacement in m , t in second and x is distance from a fixed origin in meter . The frequency, wavelength and speed of the wave respectively areA. `100Hz, 1.7 m, 170 m//s`B. `150 Hz, 2.4 m, 200 m//s`C. `80 Hz, 1.1 m , 90 m//s`D. `120 Hz, 1.25 m, 207 m//s` |
| Answer» Correct Answer - A | |
| 93. |
With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction areA. Energy, momentum and massB. EnergyC. Energy and massD. Energy and linear momentum |
| Answer» Correct Answer - D | |
| 94. |
Which of the following equations represents a waveA. `Y=A(omega t-kx)`B. `Y= A cos kx`C. `Y=A sin omega t`D. `Y=A sin (at-bx+c)` |
| Answer» Correct Answer - D | |
| 95. |
The displacement y (in cm ) produced by a simple harmonic wave is `y=(10)/(pi) sin (2000 pi t -(pi x)/(17))` . The periodic time and maximum velocity of the particles in the medium will respectively beA. `10^(-3) ` sec and 330 m/secB. `10^(-4) ` sec and 20 m/secC. `10^(-3) ` sec and 200 m/secD. `10^(-2) ` sec and 2000 m/sec |
| Answer» Correct Answer - C | |
| 96. |
The frequency of the sinusoidal wave`y=0.40 cos [2000 t +0.80 x]` would beA. `1000 pi Hz`B. `2000 Hz`C. `20 Hz`D. `(1000)/(pi)Hz` |
| Answer» Correct Answer - D | |
| 97. |
Sound waves of wavelength greater than that of audible sound are calledA. Seismic wavesB. Sonic wavesC. Ultrasonic wavesD. Infrasonic waves |
| Answer» Correct Answer - D | |
| 98. |
What is the audible range of the average human ear ?A. 0 Hz-30 HzB. 20 Hz- 20 kHzC. 20 kHz - 20,000 kHzD. 20 kHz- 20 MHz |
| Answer» Correct Answer - B | |
| 99. |
An open tube is in resonance with string (frequency of vibration of tube is n 0 ). If tube is dipped in water so that 75% of length of tube is inside water, then the ratio of the frequency of tube to string now will beA. `1`B. `2`C. `2/3`D. `3/2` |
| Answer» Correct Answer - B | |
| 100. |
A source of sound placed at the open end of a resonance column sends an acoustic wave of pressure amplitude `P_(0)` inside the tube. If the atmospheric pressure is `P_(A)`, then the ratio of maximum and minimum pressure at the closed end of the tube will beA. `((rho_(A)+rho_(0)))/((rho_(A)-rho_(0)))`B. `((rho_(A)+2rho_(0)))/((rho_(A)-2rho_(0)))`C. `(rho_(A))/(rho_(A))`D. `((rho_(A)+(1)/(2)rho_(0)))/((rho_(A)-(1)/(2)rho_(0)))` |
| Answer» Correct Answer - A | |