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Physics Test-7...

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  • Question 1
    4 / -1

    A block \(B\) is pushed momentarily along a horizontal surface with an initial velocity \(v\). If \(\mu\) is the coefficient of sliding friction between \(\mathrm{B}\) and the surface, block \(\mathrm{B}\) will come to rest after a time.

  • Question 2
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    Ratio of energies of two photons whose wavelengths are \(600 \mathring{A}\) and \(400 \mathring{A}\) is:

  • Question 3
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    A plate of mass \(m\), length \(b\) and breadth \(a\) is initially lying on a horizontal floor with length parallel to the floor and breadth perpendicular to the floor. The work done to erect it on its breadth is ____________.

  • Question 4
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    Two identical metal plates are given positive charges \(\mathrm{Q}_{1}\) and \(\mathrm{Q}_{2}\left(<\mathrm{Q}_{1}\right)\) respectively. If they are now brought close together to form a parallel plates capacitor with capacitance \(C,\) the potential difference between them is:

  • Question 5
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    A hoop of radius \(r\) and mass \(m\) rotating with an angular velocity \(\omega_{0}\) is placed on a rough horizontal surface. The initial velocity of the centre of the hoop is zero. What will be the velocity of the centre of the hoop when it ceases to slip?

  • Question 6
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    A \(1 \mathrm{kg}\) stone at the end of \(1 \mathrm{m}\) long string is whirled in a vertical circle at constant speed of \(4 \mathrm{~m} / \mathrm{sec}\). The tension in the string is \(6 \mathrm{~N},\) when the stone is at: \(\left(\mathrm{g}=10 \mathrm{~m} / \mathrm{sec}^{2}\right)\)

  • Question 7
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    Two wires of the same material (Young's modulus \(Y\) ) and same length \(L\) but radii \(R\) and \(2 R\) respectively are joined end to end and a weight \(w\) is suspended from the combination as shown in the figure. The elastic potential energy in the system is:

  • Question 8
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    A particle of mass m is located in a one dimensional field where potential energy is given by:

    \(\mathrm{V}(\mathrm{x})=\mathrm{A}(1-\cos \mathrm{px})\) where \(\mathrm{A}\) and \(\mathrm{p}\) are constants.

    The period of small oscillations of the particle is:

  • Question 9
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    A Carnot heat engine takes heat from a reservoir at \(627^{\circ} \mathrm{C}\) and rejects heat to a sink at \(27^{\circ} \mathrm{C}\). Its efficiency will be:

  • Question 10
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    The bit rate of the digital communication system is M kbps. The modulation used is 16 QAM. The minimum bandwidth required for ideal transmission is _________.

  • Question 11
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    Value of \(g\) at the surface of the earth is \(10 \mathrm{~m} / \mathrm{s}^{2}\), then the value of ' \(g\) ' at a height \(R_{e}\), from the surface of the earth is: ( \(R_{e}\) is the radius of the earth).

  • Question 12
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    When a metal rod of length I is placed normal to a uniform magnetic field ' \(\mathrm{B}\) ' and moved with a velocity ' \(v\) ' perpendicular to the field, the induced emf (called motional emf electromotive forces) across its ends is:

  • Question 13
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    A biconvex lens with focal length \(f\) in air and refractive index of \(1.5\) is floating on the surface of a deep pond of water (refractive index \(1.33\) ). If an object is placed at a height of \(2 \mathrm{f}\) vertically above the lens, then the distance between the lens and the image is:

  • Question 14
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    A carrier frequency of \(1 \mathrm{MHz}\) and peak value of \(10 \mathrm{~V}\) is amplitude modulated with a signal frequency of \(10 \mathrm{kHz}\) with peak value of \(0.5 \mathrm{~V}\). Then the modulation index and the side band frequencies respectively are:

  • Question 15
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    Which among the following statements are true with respect to semiconductor breakdown?

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