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11th Standard English Medium Physics Subject Waves Creative 1 Mark Questions with Solution Part - II

11th Standard

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Physics

Time : 00:30:00 Hrs
Total Marks : 5
    5 x 1 = 5
  1. the velocity of sound in air is 340 ms-1, a person singing a note of frequency 250 cps is producing sound waves with a wavelength of ________

    (a)

    0.7

    (b)

    1.36 cm

    (c)

    1.36 m

    (d)

    85 km

  2. As a transverse wave strikes against a fixed end ________.

    (a)

    its phase changes by 180°, but velocity does not change

    (b)

    its phase does not change, but velocity changes

    (c)

    its velocity changes and phase too changes by 180°

    (d)

    nothing can be predicted about changes in its velocity and phase

  3. A source of sounds is travelling with a velocity of 40 km/hr towards an observer and emits sound of frequency 2000 Hz. If the velocity of sound is 1220 km/hr, then what is the apparent frequency heard by the observer?

    (a)

    2068 Hz

    (b)

    2180 Hz

    (c)

    2000 Hz

    (d)

    1980 Hz

  4. A vehicle with a horn of frequency n is moving with a velocity of 30 m/s in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency n + n1. Then (if the sound velocity in air is 300 m/s) _________

    (a)

    n1 = 10 n

    (b)

    n= 0

    (c)

    n1 = -0.1 n

    (d)

    n1 = 0.1 n

  5. The Doppler effect is applicable for ________.

    (a)

    light waves

    (b)

    sound waves

    (c)

    space waves 

    (d)

    both (a) and (b)

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