Sound


  1. The echo will be heard if the original sound reflected by an obstacle in









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    NA

    Correct Option: D

    NA


  1. Learned Indian classical vocalists do not like the accompaniment of a harmonium because









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    NA

    Correct Option: A

    NA



  1. Consider the following statements :
    1. X - rays show transverse wave characteristics
    2. X - rays can eject electrons from certain metal surfaces
    3. X - rays of 0.1 A° are harder than X - rays of 0.2 A°
    Which of the statements given above is / are correct ?










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    NA

    Correct Option: D

    NA


  1. A radar beam consists of









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    NA

    Correct Option: D

    NA



  1. The velocities of sound in air and water are 336 m / s and 1470 m/s respectively. Two sources producing waves of wavelength 6 m and 7 m sounded togather will produce beats









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    NA

    Correct Option: C

    NA