Sound Waves: JEE Main Physics Previous Year Questions

268 previous year questions from Sound Waves. Here are the 25 most important ones; open any question for the correct answer and a full step-by-step solution.

1. $The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the\dots$
2. $A driver in a car, approaching a vertical wall notices that the frequency of his car horn, has changed from 440 Hz to 480 Hz, when it gets reflected fro\dots$
3. $The velocity of sound in air is doubled when the temperature is raised from 0^{\circ} C to α^{\circ} C . The value of α is\dots$
4. $The fundamental frequency of an air column in a pipe closed at one end is 100 Hz . If the same pipe is open at both ends, the frequency produced in\dots$
5. $An engine is moving towards a wall with a velocity 50 m s^{- 1} emits a note of 1.2 kHz . Speed of sound in air = 350 m s^{- 1} . Th\dots$
6. $A siren placed at a railway platform is emitting sound of frequency 5 kHz. A passenger sitting in a moving train A records a frequency of 5.5 kHz, while the train approac\dots$
7. $The speed of sound in oxygen at S.T.P. will be approximately: (Given, R = 8.3 JK^{- 1}, γ = 1.4)$
8. $A train moves towards a stationary observer with speed 34 m / s . The train sounds a whistle and its frequency registered by the observer is f_{1} . If the trai\dots$
9. $With what velocity should an observer approach a stationary sound source so that the apparent frequency of sound should appear double the actual frequency? (v is velo\dots$
10. $The velocity of sound in any gas depends upon$
11. $An air column, closed at one end and open at the other, resonantes with a tuning fork when the smallest length of the column is 50 cm. The next larger length of the colum\dots$
12. $Three sound waves of equal amplitudes have frequencies (n -1), n, (n + 1). They superimpose to give beats. The number of beats produced per second will be$
13. $A car is moving towards a high cliff. The driver sounds a horn of frequency f. The reflected sound heard by the driver has frequency 2 f . If v is the veloc\dots$
14. $The displacement of a wave travelling in the x direction is y = 10^{- 4} sin (600 t - 2 x + \frac{π}{3}) m, where x is in metre and t in second. The s\dots$
15. $The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lies below 1250 Hz are: (velocity of sound = 340\dots$
16. $A closed and an open organ pipe have same lengths. If the ratio of frequencies of their seventh overtones is (\frac{a - 1}{a}) then the value of a is ____$
17. $A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of15 m s^{- 1} . Then, the frequency of sound that the observer hear\dots$
18. $A car is moving towards a high cliff. The car driver sounds horn of frequency ‘f’. The reflected sound heard by the driver has a frequency 2f. If ‘v’ be the velocity of s\dots$
19. $A person feels 2.5% difference of frequency of a motor-car horn. If the motor-car is moving to the person and the velocity of sound is 320 m/sec, then the velocity of car\dots$
20. $The frequency of a whistle of an engine is 600 cycles/sec is moving with the speed of 30 m/sec towards an observer. The apparent frequency will be (velocity of sound = 33\dots$
21. $An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency?$
22. $A boy is walking away from a wall towards an observer at a speed of 1 meter/sec and blows a whistle whose frequency is 680 Hz. The number of beats heard by the observer p\dots$
23. $A motor cycle starts from rest and accelerates along a straight path at 2 m/ s^{2} . At the starting point of the motor cycle there is a stationary electric siren. How fa\dots$
24. $A train is moving on a straight track with speed 20 m s^{-1} . It is blowing its whistle at the frequency of 1000 Hz. The percentage change in the frequency heard by a pe\dots$
25. $An observer moves towards a stationary source of sound with a velocity equal to one-fifth of the velocity of sound. The percentage change in the frequency will be:$

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Sound Waves: JEE Main Physics Previous Year Questions

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