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.
| 501. |
Choose the WRONG statement.A. Waves are called progressive waves.If they travel in same straight line.B. Waves are called progressive waves.If they travel without change of form.C. Waves are called prograssive waves.If they travel in opposite direction.D. Waves are called progressive waves.If they are not transverse or longitudinal |
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Answer» Correct Answer - B |
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| 502. |
The rarefaction is a region of medium where the particles areA. widely separatedB. remains sameC. close togetherD. none of these |
| Answer» Correct Answer - A | |
| 503. |
During propagation of sound wave through air mediumA. the particles move forwardB. the particles do not vibrateC. the particles vibrate about their mean positionD. there is no necessity of the medium |
| Answer» Correct Answer - C | |
| 504. |
Progressive wave with doubly periodic motion means.A. from of the wave repeats itself and travel equal distance in equal interval of time.B. repetition at equal distanceC. repetition after equal intervals of timeD. repetition in medium without inertia. |
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Answer» Correct Answer - A |
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| 505. |
The distance between two consecutive points which are in the same state of oscillation isA. displacementB. wavelengthC. amplitudeD. intensity |
| Answer» Correct Answer - B | |
| 506. |
If the direction of the vibration of particles is parallel to the direction of the propagation of a wave , then the wave isA. transverse waveB. Stationary waveC. longitudinal wavesD. electromagnetic wave |
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Answer» Correct Answer - C |
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| 507. |
In the figure three progressive waves are shown. The phases of all are shown with respect to A. From this it is inferred that A. the wave C is leading by `pi//2` and wave B is lagging being by `pi//2`B. the wave C is leading by `pi` and wave B is also leading by `pi`C. the wave C is lagging by `pi` and wave B is leading by `pi`D. the wave C is lagging by `pi//2` and wave B is leading by `pi//2` |
| Answer» Correct Answer - D | |
| 508. |
The compression is a region of medium where the particle areA. widely separatedB. remains sameC. close togetherD. none of these |
| Answer» Correct Answer - C | |
| 509. |
Transverse wave travels throughA. solids onlyB. gases onlyC. liquids onlyD. solid and liquid |
| Answer» Correct Answer - A | |
| 510. |
Waves transportA. energy onlyB. momentum onlyC. intensityD. energy and momentum |
| Answer» Correct Answer - A | |
| 511. |
If the direction of the vibration of particles is parallel to the direction of the propagation of a wave , then the wave isA. transverse waveB. stationary waveC. longitudinal waveD. none of these |
| Answer» Correct Answer - A | |
| 512. |
Crest is a part of transverse wave which is calledA. concaveB. circularC. convexD. curved |
| Answer» Correct Answer - C | |
| 513. |
The sound is a form ofA. energyB. disturbanceC. waveD. all of the above |
| Answer» Correct Answer - D | |
| 514. |
Trough is a part of transverse wave which is calledA. concaveB. circularC. convexD. curved |
| Answer» Correct Answer - A | |
| 515. |
Sound travels quickest inA. airB. vacuumC. waterD. solids |
| Answer» Correct Answer - D | |
| 516. |
When a gun is fired on the moon the flash of light can be seen but sound can not be heard becauseA. sound is not produced in vacuumB. there is no atmosphere on the moonC. moon is too farD. moon absorbs sound |
| Answer» Correct Answer - B | |
| 517. |
Two identical wires of different materials are stretched by the same tesion. Velocity of transverse wave in both the string isA. sameB. proportional to their densitiesC. differentD. inversely proportional to their densities |
| Answer» Correct Answer - D | |
| 518. |
Speed of transverse wave in a string of density `100kg//m^(3)` and area of cross-section `10mm^(2)` under a tension of `106^(3)` N isA. 100m/sB. 1000m/sC. 200m/sD. 2000m/s |
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Answer» Correct Answer - B |
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| 519. |
Which of the following have the maximum intensity of sound ?A. maleB. tigerC. femaleD. man |
| Answer» Correct Answer - B | |
| 520. |
Intensity of sound depends uponA. frequencyB. velocityC. amplitudeD. wavelength |
| Answer» Correct Answer - C | |
| 521. |
Intensity and loudness of sound depends onA. amplitude of vibration onlyB. frequency onlyC. density of medium onlyD. all of the above |
| Answer» Correct Answer - D | |
| 522. |
The velocity of a transverse wave in a string depends uponA. length of the stringB. tension applied onlyC. temperatureD. tension in the string and the linear density of the material |
| Answer» Correct Answer - D | |
| 523. |
Statement-1 : Sound travels faster in moist air Statement-2 : The density of moist air is less then density of dry air.A. moist air is heavier than dry airB. the value of `gamma` for moist air is greater than that for dry airC. the pressure of moist air is greater than that of dry airD. the density of moist air is less than that of dry air |
| Answer» Correct Answer - D | |
| 524. |
Speed of sound wave in a gas `V_(1)` and rms speed of molecules of the gas at the same temperature is `v_(2)`.A. `v_(1)=v_(2)`B. `v_(1)ltv_(2)`C. `v_(1)gtv_(2)`D. `v_(1)lev_(2)` |
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Answer» Correct Answer - B |
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| 525. |
Velocity of sound in air depends onA. temperature and pressureB. prure and humidityC. temperature and humidityD. temperature, pressure and humidity |
| Answer» Correct Answer - C | |
| 526. |
If `c_(0)` and `c` denote the sound velocity and the rms velocity of the molecules in a gas, thenA. `v = C_(rms) (gamma//3)^(1//2)`B. `C_(rms) = v(2//3)^(1//2)`C. `v = C_(rms)`D. `v = C_(rms) (3//gamma)^(1//3)` |
| Answer» Correct Answer - A | |
| 527. |
Assertion: In a sinusoidal travelling wave on a string ,potential energy of deformation of string element at exterme position is maximum Reason: The particles in sinusoidal travelling wave perform SHMA. Assertion is true,Reason is true, Reason is a correct explanation for AssertionB. Assertion is True Reason is True : Reason is not a correct explanation for AssertionC. Assertion is True ,Reason is FalseD. Assertion is False but , Reason is True |
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Answer» Correct Answer - C |
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| 528. |
(i) In a travelling sinusoidal longitudinal wave, the displacement of particle of medium is represented by `s = S (x, t)`. The midpoint of a compression zone and an adjacent rarefaction zone are represented by letter ‘C’ and ‘R’ respectively. The difference in pressure at ‘C’ and ‘R’ is `DeltaP` and the bulk modulus of the medium is B. (a) How is `|(del s)/(del x)|` related to `|del/del|` (b) Write the value of `|(del s)/(del x)|_(C)` in terms of `DeltaP` and `B`. (c) What is speed of a medium particle located mid-way between ‘C’ and ‘R’. (ii) A standing wave in a pipe with a length of `L = 3 m` is described by `s=A cos ((3pi x)/(L)) sin ((3pi vt)/(L))` where `v` is wave speed. The atmospheric pressure and density are `P_(0)` and `rho` respectively. (a) At `t=L/(18v)` the acoustic pressure at `x =L/2` is `0.2` percent of the atmospheric pressure . Find the displacement amplitude A. (b) In which overtone is the pipe oscillating? |
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Answer» Correct Answer - (i) (a) `|(del S)/(del x)|_(C)= |(del S)/(del x)|_(R)` (b) `|(del S)/(del x)|_(C)=(Delta P)/(2B)` (C) Zero (ii) (a) `(0.0004LP_(0))/(3piv^(2) rho)` (b) Second |
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| 529. |
Two sources A and B give out sound waves in coherence and in phase. The sources are located at co-ordinates `(0, 0)` and `(0, 9 m)` in `xy` plane. There is a detector located at `(40 m, 0)`. It was found that the detector records continuous increase in intensity of sound when it is moved in positive y-direction for `4.5 m` but the intensity was found to fall for some distance when it is moved in negative y direction. What frequency of sound is consistent with these observations? Speed of sound `= 340 ms^( –1)`. |
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Answer» Correct Answer - `f lt 170 Hz` |
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| 530. |
Speed of longitudinal wave `vpropsqrtE`. Here, E is the modulus of elesticity. Match the following. |
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Answer» Correct Answer - (a)R, (b)P, (c )P |
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| 531. |
The frequency of a sonometer wire is f . When the weight producting the tensions are completely. Immersed in water the frequency becomes `f//2` and on immersing the weight in acertain liquid the fequency becomes `f//3`. The specific gravity of the liquid isA. `4/3`B. `16/9`C. `15/12`D. `32/ 27` |
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Answer» Correct Answer - D |
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| 532. |
When a little wax is put on the prongs of a tuning fork, then the frequency of vibration of a tuning fork willA. increaseB. remain constantC. decreaseD. both a and b |
| Answer» Correct Answer - C | |
| 533. |
The prongs of the tuning fork are filled a little, the frequency of the tuning fork after filledA. increasesB. remain constantC. decreasesD. can not be predicted |
| Answer» Correct Answer - A | |
| 534. |
In the shown figure answer the following two question. If `P_(i),P_(r),P_(t)` are powers of incident, reflected and transmitted waves and `I_(i),I_(r),I_(t)` the corresponding intensities , thenA. `P_(i)=P_(r)+P_(t)`B. `I_(i)=I_(r)+I_(t)`C. both( a) and (b) are correctD. both ( a) and (b) are wrong |
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Answer» Correct Answer - A |
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| 535. |
If `lambda_(1), lamda_(2)and lamda_(3)` are the wavelengths of the wave giving resonance with the fundamental, first and second overtones respectively of a closed orga pipe Then the ratio of wavelength `lambda_(1), lamda_(2)and lamda_(3)` isA. `1:2:3`B. `1:(1)/(3):(1)/(5)`C. `1:3:5`D. `5:3:1` |
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Answer» Correct Answer - B |
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| 536. |
The window panes of houses some times get cracked due to some explosion at large distance. The wave responsible isA. electromagnetic wavesB. longitudinal waveC. shock wavesD. both longitudinal and treansverse waves |
| Answer» Correct Answer - B | |
| 537. |
Earth is moving towards a fixed star with a velocity of `30 kms^(-1)`. An observer on earth observes a shift of `0.58 Å` in wavelength of light coming from star. What is the actual wavelength of light emitted by star ? |
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Answer» Correct Answer - 5800 Å |
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| 538. |
A streched string is forced to transmit transverse waves by means of an oscillator coupled to one end. The string has a diameter of `4mm`. The amplititude of the oscillation is `10^(-4)` m and the frequency is `10Hz`. Tension in the string is `100` N and mass density of wire is `4.2xx10^(3)kg//m^3`. Find (a) the equation of the waves along the string (b) the energy per unit volume of the wave (c) the average energy flow per unit time across any section of the string and (d) power required to drive the oscillator. |
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Answer» Correct Answer - A::B::C::D (a) Speed of transverse wave on the string is `v=sqrt((T)/(rhoS))` (as`mu=rhoS`) Substituting the values,we have `v=sqrt((100)/((4.2xx10^3)((pi)/(4))(4.0xx10^-3)^2))=43.53m//s` `omega=2pif=20pi=62.83 rad//s` `k=(omega)/(v)=1.44m^-1` :. Equation of the waves along the string, `y(x,t)=A sin (kx-omegat)` `= (10^-4m) sin[(1.44m^-1)x-(62.83 rade//s)t]` (b) Energy per unit volume of the string,`u="energy density"=(1)/(2)rhoomega^2A^2` Subsitutituting the values, we have `=u=((1)/(2))(4.2xx10^3)(62.83)^2(10^-4)^2` `= 8.29xx10^-2 J//m^3` (c) Average energy flow per unit time, `P=power=((1)/(2)rhoomega^(2)A^(2))(Sv)=(u)(Sv)` Susbstituting the values, we have `P=(8.29xx10^(-2))((pi)/(4))(4xx10^(-3)) ^(2) (43.53)` `4.53xx10^-5 J//s` (d) Therefore, power required to drive the oscillator is `4.53xx10^(-5)W`. |
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| 539. |
The equational of a stationary wave in a string is `y=(4mm) sin [(314m^(-1)x] cos omegat`. Select the correct alternative (s).A. The amplitude of component waves in 2mmB. The amplitude of componen wave is 4mmC. The smallest possible through of string is 0.5mD. The smallest possible length of string is 1.0m |
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Answer» Correct Answer - A::D |
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| 540. |
What will be the speed of sound in a perfectly rigid rod?A. zeroB. infinityC. negativeD. 1400 m/s |
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Answer» Correct Answer - B For a perfectly rigid medium elasticity property is infinity |
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| 541. |
Beast are produced by frequencies `v_(1)` and `v_(2) (v_(1) gt v_(2))`. The duration of time between two sucessive maximum or minima is equal toA. `1/(v_(1)+v_(2))`B. `2/(v_(1)-v_(2))`C. `2/(v_(1)+v_(2))`D. `1/(v_(1)-v_(2))` |
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Answer» Correct Answer - D The time-interval between two successive beats `T=(1)/("Beat frequency")=1/(v_(1)-v_(2))` |
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| 542. |
Two turning forks of frequencies `n_(1)` and `n_(2)` produces n beats per second. If `n_(2)` and n are known, `n_(1)` may be given byA. `n_(2)/n+n_(2)`B. `n_(2)n`C. `n_(2) pm n`D. `n_(2)/n-n_(2)` |
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Answer» Correct Answer - C Beat frequency = Number of beats `s^(-1)`. `n=n_(2) pm n_(1)` `:. n_(1)=n_(2) pm n` |
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