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.
| 201. |
The equation of a travelling wave is `y=60 cos(1800t-6x)` where y is in microns, t in seconds and x in metres. The ratio of maximum particle velocity to velocity of wave propagation isA. ` 3.6 xx10^(-11)`B. `3.6 xx 10 ^(-6)`C. `3.6 xx 10^(-4)`D. `3.6` |
| Answer» Correct Answer - C | |
| 202. |
Two travelling waves `y_1=Asin[k(x-ct)]` and `y_2=Asin[k(x+ct)]` are superimposed on string. The distance between adjacent nodes isA. `c t//pi`B. `c t//2 pi`C. `pi //2k`D. `pi //k` |
| Answer» Correct Answer - D | |
| 203. |
Consider the three waves `z_(1), z_(2) "and" z_(3)` as `z_(1) = A "sin"(kx - omega t)` `z_(2) = A "sin"(kx + omega t)` `z_(3) = A "sin"(ky - omega t)` Which of the following represents a standing wave?A. `z_(1) +z_(2)`B. `z_(2) +z_(3)`C. `z_(3) +z_(1)`D. `z_(1) +z_(2) +z_(3)` |
| Answer» Correct Answer - A | |
| 204. |
Beats are produced with the help of two sound waves of amplitudes 3 and 5 units . The ratio of maximum to minimum intensity in the beats isA. `2 : 1`B. `5 : 3`C. `4 : 1`D. `16 : 1` |
| Answer» Correct Answer - D | |
| 205. |
The minimum intensity of sound is zero at a point due to two sources of nearly equal frequencie4s whenA. Two sources are vibrating in opposite phaseB. The amplitude of two sources are equalC. At the point of observation, the amplitudes of two S.H.M. produced by two sources are equal and both the S.H.M. are along the same straight lineD. Both the sources are in the same phase |
| Answer» Correct Answer - C | |
| 206. |
There are `10` sound sources each producing intensity I at a point independently. The are incoherent. Average intensity of sound at that point will be:A. `I = 100 I_(0)`B. `I = 10 I_(0)`C. `I = I_(0)`D. `I = sqrt(10) I_(0)` |
| Answer» Correct Answer - B | |
| 207. |
A table is revolving on its axis at `5` revolutions per second. A sound source of frequency `1000 Hz `is fixed on the table at `70 cm` from the axis. The minimum frequency heard by a listener standing at a distance from the table will be (speed of sound `=352m//s`).A. 1000 HzB. 1066 HzC. 941 HzD. 352 Hz |
| Answer» Correct Answer - C | |
| 208. |
A source and a listener are both moving towards each other with speed `v//10`, where `v` is the speed of sound. If the frequency of the note emitted by the source is `f`, the frequency heard by the listener would be nearlyA. 1.11 fB. 1.22 fC. fD. 1.27 f |
| Answer» Correct Answer - B | |
| 209. |
A source of sound S is moving with a velocity of `50m//s` towards a stationary observer. The observer measures the frequency of the source as 1000 Hz. What will be the apparent frequency of the source as 1000 Hz. What will be the apparent frequency of the source when it is moving away from the observer after crossing him? The velocity of the sound in the medium is `350m//s`A. 750 HzB. 857 HzC. 1143 HzD. 1333 Hz |
| Answer» Correct Answer - A | |
| 210. |
In order to double the frequency of the fundamental note emitted by a stretched string, the length is reduced to `(3)/(4)`th of the original length and the tension is changed. The factor by which the tenstion is to be changed isA. `3/8`B. `2/3`C. `8/9`D. `9/4` |
| Answer» Correct Answer - D | |
| 211. |
A source of sound of frequency `n` is moving towards a stationary observer with a speed S. If the speed of sound in air is V and the frequency heard by the observer is `n_(1)` ,the value of `n_(1)//n` isA. `(V+S)//V`B. `V//(V+S)`C. `(V-S)//V`D. `V//(V-S)` |
| Answer» Correct Answer - D | |
| 212. |
An observer moves towards a stationary source of sound with a speed `((1)/(5))`th of the speed of sound. The wavelength and frequency of the source emitted are `lamda` and f, respectively. The apparent frequency and wavelength recorded by the observer are, respectively.A. `1.2 f, lambda`B. `f, 1.2 lambda`C. `0.8 f, 0.8 lambda`D. `1.2 f, 1.2 lambda` |
| Answer» Correct Answer - A | |
| 213. |
An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency?A. `5%`B. `20%`C. ZeroD. `0.5 %` |
| Answer» Correct Answer - B | |
| 214. |
A source of sound of frequency 450 cycles / sec is moving towards a stationary observer with 34 m / sec speed. If the speed of sound is 340 m / sec , then the apparent frequency will beA. 410 cycles / secB. 500 cycles / secC. 550 cycles / secD. 450 cycles / sec |
| Answer» Correct Answer - B | |
| 215. |
The equation of a wave is represented by ` y= 10^(-4) sin[ 100 t -(x)/(10)]`. The velocity of the wave will beA. `100 m//s`B. `250 m//s`C. `750 m//s`D. `1000 m//s` |
| Answer» Correct Answer - D | |
| 216. |
A transverse wave is given by `y=A sin 2 pi ((t)/(T)-(x)/(lambda))`. The maximum particle velocity is equal to 4 times the wave velocity whenA. `lambda = 2 pi A`B. ` lambda=(1)/(2) pi A`C. ` lambda = pi A`D. `lambda =(1)/(4) pi A` |
| Answer» Correct Answer - B | |
| 217. |
A wave equation which gives the displacement along y -direction is given by `y=0.001 sin (100t +x)` where x and y are in meterand t is time in second. This represented a waveA. Of frequency `(100)/(pi) Hz`B. Of wavelength one metreC. Travelling with a velocity of`(50)/(pi) ms^(-1)` in the positive X -directionD. Travelling with a velocity of `100 ms^(-1)` in the negative X -direction |
| Answer» Correct Answer - D | |
| 218. |
Water waves areA. LongitudinalB. TransverseC. Both longitudinal and transverseD. Both longitudinal and transverse |
| Answer» Correct Answer - C | |
| 219. |
It is possible to distinguish between the transverse and longitudinal waves by studying the property ofA. InterferenceB. DiffractionC. ReflectionD. Reflection |
| Answer» Correct Answer - D | |
| 220. |
The equation of a longitudinal wave is represented as `y= 20 cos pi (50 t-x)`. Its wavelength isA. 5 cmB. 2 cmC. 50 cmD. 20 cm |
| Answer» Correct Answer - B | |
| 221. |
A medium can carry a longitudinal wave because it has the propertyA. MassB. DensityC. CompressibilityD. Elasticity |
| Answer» Correct Answer - D | |
| 222. |
Two uniform strings `A and B` made of steel are made to vibrate under the same tension. If the first overtone of `A` is equal to the second overtone of `B` and if the radius of `A` is twice that of `B`, the ratio of the lengths of the strings isA. `1:2`B. `1:3`C. `1:4`D. `1:6` |
| Answer» Correct Answer - B | |
| 223. |
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 soundin air is large.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 - C | |
| 224. |
The waves in which the particles of the medium vibrate in a direction perpendicular to the direction of wave motion is known asA. Transverse waveB. Longitudinal wavesC. Propagated wavesD. None of these |
| Answer» Correct Answer - A | |
| 225. |
Statement-1 : Particle velocity and wave velocity both are independent of time. Statement-2 : For the propagation of wave motion, the medium must have the properties of elasticity and inertia.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 | |
| 226. |
The source producing sound and an observer both are moving along the direction of propagation of sound waves. If the respective velocities of sound, source and an observer are `v, v_(s)` and `v_(0)`, then the apparent frequency heard by the observer will be (n = frequency of sound)A. `(n(v+v_(o)))/(v-v_(o))`B. `(n(v-v_(o)))/(v-v_(s))`C. `(n(v-v_(o)))/(v+v_(s))`D. `(n(v+v_(o)))/(v+v_(s))` |
| Answer» Correct Answer - B | |
| 227. |
Which type of waves do not require a material medium for propagation?A. Cathode rayB. Electromagnetic waveC. Sound waveD. None of the above |
| Answer» Correct Answer - B | |
| 228. |
Mechanical waves on the surface of a liquid areA. TransverseB. LongitudinalC. TorsionalD. Both transverse and longitudinal |
| Answer» Correct Answer - D | |
| 229. |
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 polarizedA. I and IIB. II onlyC. II and IIID. I, II and III |
| Answer» Correct Answer - B | |
| 230. |
The rope shown at an instant is carrying a wave travelling towards right, created by a source vibrating at a frequency n . Consider the following statements I. The speed of the wave is `4n xx ab` II. The medium at a will be in the same phase as d after `(4)/(3n)s` III. The phase difference between b and e is `(3pi)/(2)` Which of these statements are correctA. I, II and IIIB. II onlyC. I and IIID. III only |
| Answer» Correct Answer - C | |
| 231. |
Ultrasonic, Infrasonic and audible waves travel through a medium with speeds `V_(u),V_(i) and V_(a)` respectively, thenA. `V_(u), V_(i) and V_(a)` are nearly equalB. `V_(u)ge V_(a)geV_(i)`C. `V_(u)le V_(a)leV_(i)`D. `V_(a) le V_(u) and V_(u)~~V_(i)` |
| Answer» Correct Answer - A | |
| 232. |
Intensity level of intensity `l` is 30 dB. The ratio `I/I_(0)` is (where `I_(0)` is the threshold of hearing)A. 3000B. 1000C. 300D. 30 |
| Answer» Correct Answer - B | |
| 233. |
An observer standing at the sea coast observes `54 waves` reaching the coast per minute. If the wavelength of a wave is `10 m`, find the wave velocity.A. 540 msB. 5.4 msC. 0.184 msD. 9 ms |
| Answer» Correct Answer - D | |
| 234. |
Length of a sonometer wire is either 95 cm or 100 cm. In both the cases a tuning fork produces 4 beats then the frequency of tuning fork is :-A. 156 HzB. 152 HzC. 250 HzD. 259 Hz |
| Answer» Correct Answer - A | |
| 235. |
Two tuning forks `A` and `B` vibrating simultaneously produce `5 beats//s`. Frequency of `B` is `512 Hz`. If one arm of `A` is filed, the number of beats per second increases. Frequency of `A` isA. 502B. 507C. 517D. 522 |
| Answer» Correct Answer - C | |
| 236. |
A wire of `9.8xx10^(-3) kg/m` passes over a frictionless light pulley fixed on the top of a frictionless inclined plane which makes an angle of `30^(@)` with the horizontal. Masses m and M are tied at the two ends of wire such that m rests on the plane and M hangs freely vertically downwards. the entire system is in equilibrium and a transverse wave propagates along the wire with a velocities of `100 m//s`.A. `m = 20 kg`B. `m = 5 kg`C. `m = 2kg`D. `m = 7 kg` |
| Answer» Correct Answer - A | |
| 237. |
Two speakers connected to the same source of fixed frequency are placed 2.0m apart in a box. A sensitive microphone placed at a distance of 4.0 m from their midpoint along the perpendicular bisector shows maximum response. The box is slowly rotated until the speakers are in line with the microphone. The distance between the midpoint of the speakers and the microphone remains unchanged. Exactly five maximum responses are observed in the microphone in doing this. the wavelength of the sound wave isA. `0.2 m`B. `0.4 m`C. `0.6 m`D. `0.8m` |
| Answer» Correct Answer - B | |
| 238. |
When temperature increases, the frequency of a tuning forkA. IncreasesB. DecreasesC. Remains sameD. Increases or decreases depending on the material |
| Answer» Correct Answer - B | |
| 239. |
Two strings `X` and `Y` of a sitar produces a beat of frequency `4 Hz`. When the tension of string `Y` is slightly increased, the beat frequency is found to be `2Hz`. If the frequency of `X` is `300Hz`, then the original frequency of `Y` was.A. 296 HzB. 298 HzC. 302 HzD. 304 Hz |
| Answer» Correct Answer - A | |
| 240. |
A closed organ pipe of length `L` and an open organ pipe contain gass of densities `rho_(1)` and `rho_(2)`, respectively. The compressibility of gass are equal in both the pipes. Both the pipes are vibrating in their first overtone with same frequency . The length of the open orange pipe is (a) `(L)/(3)` `(4l) / (3)` (c ) `(4l)/(3)sqrt((rho_(1))/(rho_(2)))` (d) `(4l)/(3)sqrt((rho_(2))/(rho_(1)))`A. `(L)/(3)`B. `(4L)/(3)`C. `(4L)/(3)sqrt((rho_(1))/(rho_(2)))`D. `(4L)/(3)sqrt((rho_(2))/(rho_(1)))` |
| Answer» Correct Answer - C | |
| 241. |
A wave is represented by the equation `y = A sin(10pix + 15pit + (pi)/(3))` where `x` is in meter and `t` is in seconds. The expression represents :A. A wave travelling in the positive X direction with a velocity of 1.5 m / secB. A wave travelling in the negative X direction with a velocity of 1.5 m / secC. A wave travelling in the negative X direction with a wavelength of 0.2 mD. A wave travelling in the positive X direction with a wavelength of 0.2 m |
| Answer» Correct Answer - B::C | |