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Class 11 Physics: Waves
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Avg score: 25% • Most missed: “A wave having an amplitude of 3cm is to be superimposed with another wave of the…”

MCQs on transverse and longitudinal waves, progressive wave displacement relation, travelling wave speed, waves superposition principles, waves reflection, beats and doppler effects.

Class 11 Physics: Waves
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25 Questions

1. An observer is standing stationary in air moving at a speed of 2m/s. A source of frequency 20Hz is moving in the direction of wind with speed 10m/s towards the observer. What will be the frequency as heard by the observer? Speed of sound in air is 330m/s.
2. In superposition of waves the displacements get added like vectors. True or False?
3. If both the source of sound and observer are moving, the apparent frequency will be different from the actual frequency. True or False?
4. What is the ratio of speed of sound in air when measured after laplace correction to that measured by Newton's formula?
5. The equation of a wave is given by y = 3sin(4x-2t). What is the time period and wavelength of the wave?
6. What is the expression for wave speed in the given equation: y = Asin(kx-wt + π)?
7. y1 = 2sin(3x – 2t) & y2 = 3sin(3x – 2t + π/4). Find the expression for resultant displacement caused by superposition of the two waves.
8. The speed of sound in air is 330m/s. What is the mass of 1 mole of air? Assume it is an ideal gas.
9. A man jumps from a building with a source of sound. When he reaches halfway down, he starts the siren of frequency 100Hz. A person standing below him on the ground hears the first sound to be of frequency 120Hz. What is the height of the building? Speed of sound = 330m/s. Take g=9.81m/s2.
10. Standing waves can be produced when two identical waves, having a phase difference of π, are travelling in the same direction. True or False?
11. Why is the speed of longitudinal waves sound in solids greater than that in liquids?
12. A source moves towards a stationary observer with a speed of 10m/s. If the frequency of the source is 10Hz what will be the wavelength of sound heard by the observer? Speed of sound = 330m/s.
13. What is the minimum distance between a node & an antinode in a standing wave?
14. If a string wave encounters a completely fixed end, what happens to its phase?
15. A train with a frequency 'f'. What will be the frequency heard by a person sitting in the train? Speed of the train is 'v'.
16. A source of sound moves towards an observer. What happens to the speed of sound in the medium?
17. Consider the phenomenon of beats & select the correct statement.
18. Electromagnetic waves are considered to be which of the following types?
19. The equation of a wave is: y = 2sin(4x-3t). What will be the equation of the reflected wave from a free surface?
20. A passenger is standing on a platform. A train is arriving with speed =100m/s. It whistles at point B while the passenger is at point A. What is the frequency heard by the passenger if the whistle frequency is 100Hz? Speed of sound = 330m/s.
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21. A wave having an amplitude of 3cm is to be superimposed with another wave of the same amplitude. What should be their phase difference if the net amplitude has to be 0?
22. Consider standing waves in an air column with one end closed. What is a pressure node?
23. All waves require material for propagation. True or False?
24. Two longitudinal waves: s1 = 3cos(11t) & s2 = 3cos(10t) interfere. What is the amplitude of the resulting wave?
25. Transverse waves involve energy transfer by movement of medium particles, while longitudinal waves don't. True or False?

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