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Physics Test - ...

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  • Question 1
    4 / -0.83

    The equation of a wave disturbance is given as :
     where X and y are in metres and t  in seconds. Choose the wrong statement:

  • Question 2
    4 / -0.83

    In a plane progressive harmonic wave particle speed is always less than the wave speed if:
    (where A is wavelength of wave)

  • Question 3
    4 / -0.83

    Which of the following is not the standard form of a sine wave?

  • Question 4
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    Two sound source are moving in opposite directions with velocities v1 and v2 (v1 >v2 ). Both are moving away from a stationary observer. The frequency of both the sources is 900 Hz. What is the value of v1 - v2 so that the beat frequency observed by the observer is 6 Hz. Speed of sound v = 300 mis. Given, that v1  and v2 «v.

  • Question 5
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    String 1 has twice the length, twice the radius, twice the tension and twice the density of another string 2. The relation between the fundamental frequencies of 1 and 2 is :

  • Question 6
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    A string of length L is stretched by L/20 and speed of transverse wave along it is v. The speed of wave when it is stretched by L/10 will be : (assume the Hooke ’s law is applicable)

  • Question 7
    4 / -0.83

    Speed of transverse wave in a string of density 100 kglm3 and area of cross-section  10 mm2 under the tension of 103 N is :

  • Question 8
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    A wave represented by the equation y1 = Acos(kx- ωt), is superimposed with  another wave to form a stationary wave such that the point  x = 0 is a node. The equation of the other wave is :

  • Question 9
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    The frequency changes by 10% as the source approaches a stationary observer with constant speed vs . What would be the percentage change in frequency as the source recedes the observer with the same speed ? Given, that vs «v ( v = speed of sound in air)

  • Question 10
    4 / -0.83

    A heavy rope is suspended from a rigid support. A wave pulse is set up at the lower  end, then :

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