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.
| 1. |
A standing wave having 3 nodes and 2 antinodes is formed between two atoms having a distance 1.21Å between them. The wavelength of the standing wave isA. `1.21 Å`B. `2.42 Å`C. `6.05 Å`D. `3.63Å` |
| Answer» Correct Answer - A | |
| 2. |
What is the distance between a node and an adjoining antinode in a stationary wave?A. `lambda`B. `(lambda)/(2)`C. `(lambda)/(4)`D. `2 lambda` |
| Answer» Correct Answer - C | |
| 3. |
A wave frequency `100 Hz` travels along a string towards its fixed end . When this wave travels back after reflection , a node is formed at a distance of `10 cm `from the fixed end . The speed of the wave (incident and reflected) isA. 40 m / sB. 20 m / sC. 10 m / sD. 5 m / s |
| Answer» Correct Answer - B | |
| 4. |
The equation of stationary wave along a stretched string is given by `y=5 sin ((pix)/(3)) cos 40 pi t `, where x and y are in cm and t in second. The separation between two adjacent nodes isA. 5 cmB. `pi cm`C. 3 cmD. 40 cm |
| Answer» Correct Answer - C | |
| 5. |
`y= a cos (kx + omega t)` superimposes on another wave giving a stationary wave having node at x = 0. What is the equation of the other waveA. `-a cos (kx+ omega t)`B. `a cos (kx - omega t)`C. `-a cos (kx- omega t)`D. `-a sin (kx + omega t)` |
| Answer» Correct Answer - C | |
| 6. |
Energy is not carried by which of the following wavesA. StationaryB. ProgressiveC. TransverseD. Electromagnetic |
| Answer» Correct Answer - A | |
| 7. |
Two waves are approaching each other with a velocity of 16 m/s and frequency n. The distance between two consecutive nodes isA. ` (16)/(n)`B. `(80)/(n)`C. `(n)/(16)`D. `(n)/(8)` |
| Answer» Correct Answer - B | |
| 8. |
Equation of a stationary wave is `y=10 sin ((pi x)/(4)) cos 20 pi t` Distance between two consecutive nodes isA. 4B. 2C. 1D. 8 |
| Answer» Correct Answer - A | |
| 9. |
In stationary waves all particles between two nodes pass through the mean positionA. At different times with different velocitiesB. At different times with the same velocityC. At the same time with equal velocityD. At the same time with different velocities |
| Answer» Correct Answer - D | |
| 10. |
A second harmonic has to be generated in a string of length l stretched between two rigid supports. The point where the string has to be plucked and touched areA. Plucked at `l/4` and touch at `l/2`B. Plucked at `l/4` and touch at `(3l)/4`C. Plucked at `l/2` and touches at `l/4`D. Plucked at `l/2` and touched at `(3l)/4` |
| Answer» Correct Answer - A | |
| 11. |
Unlike a laboratory sonometer, a stringed instrument is seldom plucked in the middle. Supposing a sitar string is plucked at about `(1)/(4)th` of its length from the end. The most prominent harmonic would beA. EighthB. FourthC. ThirdD. Second |
| Answer» Correct Answer - D | |
| 12. |
A stretched string of length l, fixed at both ends can sustain stationary waves of wavelength `lambda` given byA. `lambda=(n^(2))/(2l)`B. `lambda=(l^(2))/(2n)`C. `lambda=(2l)/n`D. `lambda=2ln` |
| Answer» Correct Answer - C | |
| 13. |
A stretched string of length ` 1 m` fixed at both ends , having a mass of `5 xx 10^(-4) kg` is under a tension of `20 N`. It is plucked at a point situated at `25 cm` from one end . The stretched string would vibrate with a frequency ofA. 100 HzB. 200 HzC. 256 HzD. 400 Hz |
| Answer» Correct Answer - B | |
| 14. |
A tuning fork of frequency `340 H_(Z)` is sounded above an organ pipe of length `120 cm` . Water is now slowly poured in it . The minimum height of water column required for resonance is ( speed of sound in air = `340 m//s`)A. 15 cmB. 25 cmC. 30 cmD. 45 cm |
| Answer» Correct Answer - D | |
| 15. |
Two tuning forks of frequencies `256 Hz` and `258 Hz` are sounded together. The time interval, between two consecutive maxima heard by an observer isA. 2 secB. `0.5 sec`C. 250 secD. 252 sec |
| Answer» Correct Answer - B | |
| 16. |
When a tuning fork of frequency 341 is sounded with another tuning fork, six beats per second are heard. When the second tuning fork is loaded with wax and sounded with the first fork, the number of beats is two per second. The natural frequency of the second tuning fork isA. 334B. 339C. 343D. 347 |
| Answer» Correct Answer - D | |
| 17. |
Two tuning forks when sounded together produced `4beats//sec`. The frequency of one fork is 256. The number of beats heard increases when the fork of frequency 256 is loaded with wax. The frequency of the other fork isA. 504B. 520C. 260D. 252 |
| Answer» Correct Answer - C | |
| 18. |
Two sound waves of wavelengths 5 m and 6 m formed 30 beats in 3 seconds. The velocity of sound isA. 300 msB. 310 msC. 320 msD. 330 ms |
| Answer» Correct Answer - A | |
| 19. |
A tuning fork arrangement (pair) produces `4 beats//sec` with one fork of frequency `288cps`. A little wax is placed on the unknown fork and it then produces `2 beats//sec`. The frequency of the unknown fork isA. 286 cpsB. 292 cpsC. 294 cpsD. 288 cps |
| Answer» Correct Answer - B | |
| 20. |
The wavelength of a particle is 99 cm and that of other is 100 cm. Speed of sound is 396 m/s. The number of beats heard isA. 4B. 5C. 1D. 8 |
| Answer» Correct Answer - A | |
| 21. |
A tuning fork A produces 4 beats/sec with another tuning fork B of frequency 320 Hz . On filing the fork A , 4 beats/sec are again heard. The frequency of fork A , after filing isA. 324 HzB. 320 HzC. 316 HzD. 314 Hz |
| Answer» Correct Answer - A | |
| 22. |
A source of sound of frequency `256Hz` is moving rapidly towards wall with a velocity of `5m//sec`. How many beats per second will be heard if sound travels at a speed of `330m//sec`.A. 7.8 HzB. 7.7 HzC. 3.9 HzD. Zero |
| Answer» Correct Answer - A | |
| 23. |
A person carrying a whistle emitting continuously a note of `272 Hz` is runnig towards a reflecting surface with a speed of `18km//h`. The speed of sound in air is `345ms^(-1)` The number of beats heard by him isA. `4`B. `6`C. `8`D. `3` |
| Answer» Correct Answer - C | |
| 24. |
The driver of a car travelling with speed `30ms^-1` towards a hill sounds a horn of frequency 600 Hz. If the velocity of sound in air is `330ms^-1`, the frequency of reflected sound as heard by driver isA. 720 HzB. 555.5 HzC. 550 HzD. 500 Hz |
| Answer» Correct Answer - A | |
| 25. |
A police car horn emits a sound at a frequency 240 Hz, when the car is at rest. If the speed of the sound is 330 m/s the frequency heard by an observer who is approching the car at a speed of 11 m/s isA. 248 HzB. 244 HzC. 240 HzD. 230 Hz |
| Answer» Correct Answer - A | |
| 26. |
A person observes a change of 2.5 % in frequency of sound of horn of a car. If the car is approaching forward the person & sound velocity is 320 m/s, then velocity of car in m/s will be approximaterly :-A. 8 m / s (approx.)B. 800 m / sC. 7 m / sD. 6 m / s (approx.) |
| Answer» Correct Answer - A | |
| 27. |
The ends of a stretched wire of length `L` are fixed at `x = 0 and x = L`. In one experiment, the displacement of the wire is `y_(1) = A sin(pi//L) sin omegat` and energy is `E_(1)` and in another experiment its displacement is `y_(2) = A sin (2pix//L ) sin 2omegat` and energy is `E_(2)`. ThenA. `E_(2) = E_(1)`B. `E_(2) = 2E_(1)`C. `E_(2) = 4E_(1)`D. `E_(2) = 16E_(1)` |
| Answer» Correct Answer - C | |
| 28. |
In a large room, a person receives direct sound waves froma source 120 metres away from him. He also receives waves from the same source which reach him, being reflected from the 25 metre high ceiling at a point halfway between them. The two waves interfere constuctively for wavelength ofA. 20, 20/3, 20/5 etcB. 10, 5, 2.5 etcC. 10, 20, 30 etcD. 15, 25, 35 etc |
| Answer» Correct Answer - A::B::C::D | |
| 29. |
Assertion: Sound travels faster in solids than gases. Reason: Solid possesses greater density than gases.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 | |
| 30. |
Two identical flutes produce fundamental notes of frequency `300Hz` at `27^@C`. If the temperature of air in one flute is increased to `31^@C`, the number of the beats heard per second will beA. 1B. 2C. 3D. 4 |
| Answer» Correct Answer - B | |
| 31. |
Velocity of sound is maximum inA. AirB. WaterC. VacuumD. Steel |
| Answer» Correct Answer - D | |
| 32. |
At what temperature will the speed of sound be double of its value at `0^@C ` ?A. 819 kB. `819^(@)`CC. `600^(@)`CD. 600 K |
| Answer» Correct Answer - B | |
| 33. |
The temperature at which the speed of sound in air becomes double of its value at `27^(@)C` isA. `54^(@)C`B. `327^(@)C`C. `927^(@)C`D. `-123^(@)`C |
| Answer» Correct Answer - C | |
| 34. |
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 beA. vB. 2vC. 4vD. `v//4` |
| Answer» Correct Answer - A | |
| 35. |
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 min, then their wavelength isA. 13.8 mB. 25.3 mC. 41.5 mD. 57.2 m |
| Answer» Correct Answer - B | |
| 36. |
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 isA. `-73^(@)C`B. `27^(@)C`C. `127 ^(@)C`D. `327 ^(@)C` |
| Answer» Correct Answer - B | |
| 37. |
When sound waves travel from air to water, which of the following remains constantA. VelocityB. FrequencyC. WavelengthD. All the above |
| Answer» Correct Answer - B | |
| 38. |
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 beA. `sqrt((d_(2))/(d_(1)))`B. `sqrt((d_(1))/(d_(2)))`C. `d_(1) d_(2)`D. `sqrt(d_(1)d_(2))` |
| Answer» Correct Answer - A | |
| 39. |
It takes 2.0 seconds for a sound wave to travel between two fixed points when the day temperature is `10^(@) C`. If the temperature rise to `30 ^(@)C` the sound wave travels between the same fixed parts inA. 1.9 secB. 2.0 secC. 2.1 secD. 2.2 sec |
| Answer» Correct Answer - A | |
| 40. |
The velocity of sound is `v_(s)` in air. If the density of air is increased to 4 times, then the new velocity of sound will beA. `(v_(s))/(2)`B. `(v_(s))/(12)`C. `12v_(s)`D. `(3)/(2)v_(s)^(2)` |
| Answer» Correct Answer - A | |
| 41. |
`v_(1) and v_(2)` are the velocities of sound at the same temperature in two monoatomic gases of densities `A. `1 : 2`B. `4 : 1`C. `2 : 1`D. `1 : 4` |
| Answer» Correct Answer - C | |
| 42. |
If `v_(m)` is the velocity of sound in moist air, `v_(d)` is the velocity of sound in dry air, under identical conditions of pressure and temperatureA. `V_(m) gt V_(d)`B. `V_(m) lt V_(d)`C. `V_(m)=V_(d)`D. `V_(m)V_(d)=1` |
| Answer» Correct Answer - A | |
| 43. |
A man standing between two parallel hills, claps his hand and hears successive echoes at regular intervals of 1s. If velocity of sound is 340 m `s^(-1)`, then the distance between the hills isA. 340 mB. 1620 mC. 680 mD. 1700 m |
| Answer» Correct Answer - A | |
| 44. |
The amplitude of a wave disturbance propagating in the positive x-direction is given by `y = (1)/((1 + x))^(2)` at time `t = 0` and by `y = (1)/([1+(x - 1)^(2)])` at `t = 2 seconds`, `x and y` are in meters. The shape of the wave disturbance does not change during the propagation. The velocity of the wave is ............... m//s`.A. 0.5B. 1C. 2D. 4 |
| Answer» Correct Answer - A | |
| 45. |
An organ pipe, open from both end produces 5 beats per second when vibrated with a source of frequency 200 Hz . The second harmonic of the same pipes produces 10 beats per second with a source of frequency 420 Hz . The frequency of source isA. 195 HzB. 205 HzC. 190 HzD. 210 Hz |
| Answer» Correct Answer - B | |
| 46. |
In one metre long open pipe what is the harmonic of resonance obtained with a tuning fork of frequency 480 HzA. FirstB. SecondC. ThirdD. Fourth |
| Answer» Correct Answer - C | |
| 47. |
Length of a string tied to two rigid support is `40cm`. Maximum length (wavelength in cm) of a stationary wave produced on it isA. 20B. 80C. 40D. 120 |
| Answer» Correct Answer - B | |
| 48. |
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 toA. `60 pi cm //sec`B. `30 pi cm //sec`C. `30 cm //sec`D. `60 cm //sec` |
| Answer» Correct Answer - A | |
| 49. |
A tuning fork makes `256` vibrations per second in air. When the speed of sound is `330 m//s`, the wavelength of the note emitted is :A. 0.56 mB. 0.89 mC. 1.11 mD. 1.29m |
| Answer» Correct Answer - D | |
| 50. |
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 )A. 3 seconds fastB. 3 seconds slowC. 6 seconds fastD. 6 seconds slow |
| Answer» Correct Answer - D | |