28/03/2020 General Waves – Types and Properties(Senior Class Physics Study by Topics) 28/03/2020 0Comments by Gate Academy Welcome to your General Waves - Types and Properties(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. The source of sound generating of a frequency of 3 kHz reaches an observer with a speed of 0.5 times the velocity of sound in air. The frequency heard by the observer is? 1kHz 4 kHz 6 kHz 3 kHz 2. An organ pipe, open at both ends produce 5 beats per second when vibrated with a source of frequency 200Hz. The second harmonic of the same pipe produces 10 beats per second with a source of frequency 420 Hz. The frequency of source is? 195Hz 210Hz 205Hz 190Hz 3. In a transverse wave, the distance between two adjacent crests is the wavelength half of the wave length twice the wavelength one quarter of the wave length 4. Any line or section taken through an advancing wave in which all particles are in the same phase is called the wave front wave amplitude wavelength wave crest 5. Sound travels through a gas under which of the following condition? Isothermal condition Adiabatic condition Non-isothermal condition Transverse condition 6. A boat at anchor is rocked by waves whose crests are 100 m apart and whose velocity is 25 m/s. At what interval does the wave crest reach the boat? 4 s 0.24 s 75 s 2500 s 7. Which of the following is not a type of electromagnetic wave? Red light Radio waves Gamma radiation Sound 8. In which medium sound travels faster? Gas Liquid Solid Water vapour 9. Which of the following statements are correct of the production and propagation of waves?I. vibration produces waves II. waves transmit energy along the mediumIII. the medium through which the wave travels does not travel with the waveIV. waves do not require any medium for transmission III & IV only I, II & III only I & IV only II & IV only 10. A car sounding its horn at 480Hz moves towards a high wall at a speed of 20m/s, the frequency of the reflected sound heard by the man sitting in the car will be nearest to ________ 480Hz 540Hz 510Hz 570Hz 11. A source emits a sound of a frequency of 400Hz, but the listener hears it’s to be 390Hz. Then? The listener has a defective ear The listener is moving away from the source The listener is moving towards the source The source is moving towards the listener 12. A wave travels a distance of 20 cm in 3 s. The distance between successive crests of the wave is 4 cm. What is the frequency of the wave? 0.6 Hz 1.67 Hz 8.0 Hz 15.0 Hz 13. Transverse waves can be formed in fluids. False True 14. Following two wave trains are approaching each othery1=asin200πt, y2=asin208πt.The number of beats heard per second is? 8 Zero 4 1 15. The material that a wave travels through is called the Rarefaction Medium Amplitude Compression 16. A person is standing on a railway platform and a train is approaching to him, what is maximum wavelength of sound he can hear? Wavelength of whistle=1m, speed of sound in air=330m/s, speed of train=36km/h. 12/13m 33/32m 1m 32/322m 17. If the wavelength of a wave travelling with a velocity of 360 m/s is 60 m. The period of the wave is 3.6 s 0.17 s 0.6 s 6s 18. When a pebble is dropped into a pond of still water, what happens? The pebble moves Water moves Particles move Waves move 19. Mechanical waves are called elastic waves. True False 20. A wave transmits momentum. Can’t it transfer angular momentum? True False 21. What are the essential properties a medium must possess for the propagation of mechanical waves Minimum friction Stable pressure Constant temperature Maximum friction 22. Two waves are propagating with the same amplitude and nearly same frequency in opposite direction, they result in ___ Beats Wave packet Stationary wave Resonance 23. As the frequency of a spring wave is increased, the ______ Velocity increases Wavelength increases Wavelength decreases Velocity decreases 24. A racing car moving towards a cliff sound its horn. The driver observes that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If v is the velocity of sound, the velocity of the car is? v/√2 v/3 v/2 v/4 25. Speed of recession of a galaxy is proportional to its distance _____ Linearly Exponentially Inversely Directly 1 out of 25 Time is Up! Time's up