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Physics Test - ...

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  • Question 1
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    The energy flux of sunlight reaching the surface of the earth is \(1.388 \times 10^{3} \mathrm{Wm}^{-2}\). The photons in the sunlight have an average wavelength of \(550 \mathrm{~nm}\). How many photons per square metre are incident on the earth per second?

  • Question 2
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    Light is polarized to the maximum when it is incident on a glass surface at an angle of incidence:

  • Question 3
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    A particle is executing linear simple harmonic motion of amplitude \('A'\). What fraction of the total energy is kinetic when the displacement is half the amplitude?

  • Question 4
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    The speed of the particle is increasing at the rate of a \({m} / {s}^{2}\) when it is rotating in the circular path of radius \({R}\). Find the acceleration of the particle when its speed is \({v}\).

  • Question 5
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    An electric heating element consumes \(500 {~W}\) power when connected to a \(100 {~V}\) line. If the line voltage becomes \(150 {~V}\). the power consumed will be:

  • Question 6
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    Through which mode of wave propagation are the radio waves sent from one place to another?

  • Question 7
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    A particle is projected vertically with speed \(V\) from the surface of the earth. Maximum height attained by the particle, in terms of the radius of earth \(R, V\) and \(g\) is \((V\) escape velocity, \(g\) is the acceleration due to gravity on the surface of the earth).

  • Question 8
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    In a compound microscope, the objective and the eyepiece have focal lengths of \(5\) cm and \(9.5\) cm, respectively, and both are kept at a distance of \(20\) cm. If the final image is formed at the least distance of \(25\) cm from the eyepiece, find the total magnification.

  • Question 9
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    A body is thrown vertically upwards. Which one of the following graphs correctly represent the velocity vs time?

  • Question 10
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    Match List-I with List-II.

      List-I   List-II
    A. Coefficient of viscosity I. \(\left\{\left[\mathrm{ML}^2 \mathrm{~T}^{-2}\right]\right\}\)
    B. Surface Tension II. \(\left\{\left[\mathrm{ML}^2 \mathrm{~T}^{-1}\right]\right\}\)
    C. Angular momentum III. \(\left\{\left[\mathrm{ML}^{-1} \mathrm{~T}^{-1}\right]\right\}\)
    D. Rotational kinetic energy  IV. \(\left\{\left[\mathrm{ML}^0 \mathrm{~T}^{-2}\right]\right\}\)

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