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    				| 1. | What do you understand by the term vibration or oscillation? Give some examples of vibrations you see in your daily life. | 
| Answer» tion:Ultrasound is ALSO USED to detect CRACKS in aircraft and structures. Musical instruments and loudspeakers are a second example of systems which PUT VIBRATIONS to good use. Finally, most mechanical clocks use vibrations to measure time. | |