Wave Motion Questions: Paper - 02 | More Physics Questions | ||

1. |
A transverse wave given by y = 2 sin (0.01x + 30t) moves on a stretched string from one end to another end is 0.5 sec. if x and y are in cm and t is in sec, then the length of the string is (a) 6 m (b) 9 m (c) 12 m (d) 15 m Answer: (d) |

2. |
Two waves are represented by x (a) (b) (c) (d) p Answer: (c) |

3. |
The displacement y (in cm) produced by a simple harmonic wave is given by
(a) 10 (b) 10 (c) 10 (d) 10 Answer: (c) |

4. |
Two sound waves are given by y = a sin (wt - kx) and y’ = b cos (wt - kx). The phase difference between the two
waves is (a) (b) (c) p (d) Answer: (a) |

5. |
The equation of a progressive wave is given by, y = 5 sin p (a) 100 Hz (b) 50 Hz (c) 25 Hz (d) 10 Hz Answer: (c) |

6. |
If V is the velocity of the wave and w is the angular velocity, then the propagation constant (K) of the wave is given by (a) (b) (c) K = 2pn (d) Answer: (b) |

7. |
Two sounding
bodies producing progressive wave given by y
(a) 2 beats per second with intensity ratio (4/3) between maxima and minima (b) 2 beats per second with intensity ratio (49/1) between maxima and minima (c) 4 beats per second with intensity ratio (7/1) between maxima and minima (d) 4 beats per second with intensity ratio (4/3) between maxima and minima Answer: (b) |

8. |
56 tuning forks are so arranged in series, that each fork gives 4 beats/second with the previous one. If the frequency of the last fork is 3 times that of the first, then the frequency of the first fork will be (a) 55 Hz (b) 110 Hz (c) 75 Hz (d) 220 Hz Answer: (b) |

9. |
The speed of
sound in air at N.T.P. is 300 m/s. if air pressure becomes four times, then
the speed of sound will be (a) 150 m/s (b) 300 m/s (c) 600 m/s (d) 1200 m/s Answer: (b) |

10. |
Two sound
waves having a phase difference of 60° have path difference of (a) 2 l (b) (c) (d) Answer: (c) |

11. |
The velocity
of sound is measured in hydrogen and oxygen at a certain temperature. The
ratio of the velocities is, (a) 1:1 (b) 1:2 (c) 1:4 (d) 4:1 Answer: (d) |

12. |
Consider the following statements:
(a) Both (A) and (R) are true and (R) is the correct explanation of (A) (b) Both (A) and (R) are true but (R) is not the correct explanation of (a) (c) (A) is true but (R) is false (d) (A) is false but (R) is true Answer: (a) |

13. |
If the amplitude of waves at a distance r from a line source is A, then amplitude at a distance 4 r will be: (a) 2A (b) A (c) (d) Answer: (d) |

14. |
The equation
of a progressive wave traveling on a string is y = 4 sin (a) 64 cm/s along + x direction. (b) 64 cm/s along - x direction. (c) (d) Answer: (c) |

15. |
What is the
phase difference between two successive crest in the wave? (a) p (b) (c) 2p (d) 4p Answer: (c) |

16. |
If the
amplitude of sound is doubled and the frequency reduced to one-fourth, the
intensity of sound at the same point will be (a) Increasing by a factor of 2 (b) Decreasing by a factor of 2 (c) Decreasing by a factor of 4 (d) Unchanged Answer: (c) |

17. |
Which of the
following expressions is that of a simple harmonic progressive wave (a) a sin wt (b) a sin (wt) cos (kx) (c) a sin (wt - kx) (d) a cos kx Answer: (c) |

18. |
Frequency of tuning forks are 320 Hz. And 325 Hz. If they are sounded together, the beat period is…….
(a) 5 second (b) 6 second (c) 0 second (d) 0.2 second Answer: (d) |

19. |
A wave
equation which gives the displacement along the Y direction is given by y = 10 (a) Traveling with a velocity of 30 m/s in the negative x direction (b) Of wavelength x metre (c) Of
frequency (d) All of the above Answer: (d) |

20. |
Equation of progressive wave is given by y = 4 sin p (a) n = 5 cm (b) l = 18 m (c) a = 0.04 m (d) f = 50 Hz Answer: (b) |

21. |
The velocity of sound in any gas depends upon
(a) Wavelength of sound only (b) Density and elasticity of gas (c) Intensity of sound waves only (d) Amplitude and frequency of sound Answer: (b) |

22. |
The amplitude
of two waves are in the ratio 5:2. if all other conditions for the two waves
are same, then what is the ratio of their energy densities? (a) 5 : 2 (b) 10 : 4 (c) 2.5 : 4 (d) 25 :4 Answer: (d) |

23. |
Ultrasonic waves are those waves
(a) To which man can hear (b) Man can not hear (c) Are of high velocity (d) Of high amplitude Answer: (b) |

24. |
The velocity
of sound in air at 4 atmosphere and that at 1 atmosphere pressure would be (a) 1 : 1 (b) 4 : 1 (c) 1 : 4 (d) 3 : 1 Answer: (a) |

25. |
To demonstrate the phenomenon of beats we need (a) Two sources which emit radiation of nearly the same frequency (b) Two sources which emit radiation of exactly the same frequency (c) Two sources which emit radiation of exactly the same frequency and have a definite phase relationship (d) Two sources which emit radiation of exactly the same wavelength Answer: (a) |