TRUE or FALSE 1. The density of medium affect speed of sound. 2. A bat makes use of the properties of sound waves to locate its prey. 3. Properties of a sound wave changes when it travels from one medium to another. 4. The Doppler Effect abo occurs with waves other than sound waves. 5. The Doppler Effect occurs when a wave source moves towards an observer. 6. The Doppler Effect occurs when an observer moves towards a wave source. 7. The Doppler Effect occurs when an observer moves away from a wave source. 8. When an object is less dense than the fluid in which it is placed, the object will float. 9. Fluid pressure is independent on velocity. 10. Pressure is the force exerted against an opposing fluid or thrust distributed over a Surface. Multiple Choice 11. When the car moves away from you, its horn seems A. low pitched B. normal C. high pitched D. none of the above 12.When a car moves forwards you, the sound of its horn seems relatively A. low pitched B. normal C. high pitched D. none of the above 13. The infrared, visible and ultraviolet ranges, which falls between x-rays and microwaves. A. wave B. light wave C. sound wave D. none of these 14.Whai is a long body of water curling into an arched form and breaking on the shore? A. wave. B. light wave C. sound wave D. none of these 15. What is a wave of compression and rare 'faction, by which sound is propagated in an elastic medium such as air? A. wave B. light wave C. sound wave D. none of these 16. What sort of waves exhibits the Doppler Effect? A. water wave B. light wave C. sound wave D. none of these 17.The Doppler Effect is produced if A. the detective is in motion C. both of these B. the source is in motion D. none of these 18.The source of a sound moves away from the listener. The listener, has the impression that the source is . A. lower in pitch C. higher in amplitude B. lower in velocity D. all of the above 19. As a person walks towards the speaker, the frequency he or she hears A. decreases C. increases or decreases, depending on temperature B. increase. D. remains the same 20. When two or more waves are at the same place at the same lime, the resulting effect is called_. A. interference B. a standing wave C. a shock wave D. the Doppler Effect 21.5tanding waves occurs because of A. wavelength B. frequency C. wave speed D. interference 22.The Doppler Effect is the change in observed frequency due to A. the type of wave C. the medium through which wave travels B. the motion of the source. D. both the motion of the source and the medium 23.As a sound source (such as an ambulance) moves toward you, the pitch of the sound A. decreases B. increases C. does not change 24. lwo trains A and B approach 0 station from opposite sides, sounding their whistles. A stationary observer on the platform hears no beats. if the velocities of A and B are 15 m/s and 30 m/s respectively and the real frequency of the whistle of B is 600 Hz, the real frequency of the whistle of A is (velocity of sound = 330 m/s}. A570 Hz B.600 Hz C.630 Hz D.660 Hz 25. If the source of sound moves at the same speed or faster than speed of the wave then it results in_ A. beats B. shock waves C. Doppler Effect D. refraction of sound 26.Which medical instrument uses Doppler Effect? A. Stethoscope B.MR| machine C. Echocardiography D. Ultrasound machine 27.Doppler's effect in sound is A. infinite B. symmetrical C. asymmetrical D. superimposing 28. In Doppler's effect change in frequency depends on A. density of air C. distance between source and listener B. speed of source and listener D. half of distance between source and listener 29.Pressure is defined as A. force x distance C. force/area B. mass/volume D. mass acceleration 30.The force acting normally per unit area on the surface of the body is known as A. pressure B. power C. stress D. strain 31. In SI units, the unit of pressure is . A. Pa B. pi C. omega D. newton 32. The pressure is defined as the force acting per unit A. area B. mass C. Volume D. density 33. We can calculate pressure P by the formula A. area/ force B. force/ area C. force + area D. force x area 34.The device used to measure the fluid pressure is A. Hygrometer B. Calorimeter C. Manometer D. Thermometer 35. What type of liquids are measured using a manometer? A. heavy liquids B. light liquids C. medium liquids D. heavy and light liquids 36. Which among these devices are best suited for the measurement of high pressure liquids with high accuracy? A. Vacuum gauge C. Dead weight gauge B. lionization gauge D. Manganin wire pressure 37. What is the instrument used for the automatic control scheme during the fluid flow? A. Rotameters B. Pulley plates C. Rotary piston D. Pitot static tube 38. Viscosity is defined as A. Resistance to flow of an object C. Resistance to flow of fluid B. Resistance to flow of air D. Resistance to flow of heat 39. The pressure that seawater exerts on a submerged submarine is called A. liquid pressure C. submerged pressure B. underwater pressure D. hydrostatic pressure 40. Why does atmospheric pressure decrease with height? A. The amount of air gets less as height increases C. There are less clouds as height increases B. There is no gravity at high altitudes D. Air weighs less at high altitudes