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Physics Test - ...

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  • Question 1
    1 / -0

    What is emf?

  • Question 2
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    Two small charged spheres \(A\) and \(B\) have charges \(10 \mu C\) and \(940 \mu C\), respectively, and are held at a separation of \(90 \) cm from each other. At what distance from \(A\) would the electric intensity be zero?

  • Question 3
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    When light is incident on a metal surface the maximum kinetic energy of emitted electrons:

  • Question 4
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    A current sheet where current per unit length is \(6.0 \frac{~A}{m}\) and direction is towards \(+\mathrm{i}\) is placed at \(z=0\) in the X-y plane. A current wire is located at \(y=0\) and \(z=5\) m. It is placed along the \(x\) axis. Find the current and its direction if Magnetic field is zero at the point \(P\) whose location is (0,0,2.5) \(\mathrm{m}\):

  • Question 5
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    If electric power from \(100 MW\) power station is transmitted to a substation at \(20000 V\), the power loss during transmission is \(P_1\). If the same power is transmitted at \(200 V\), the power loss is \(P_2\). The ratio \(\frac{P_2}{P_1}\) will be:

  • Question 6
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    The weight of an astronaut in an artificial satellite revolving around the earth is _______.

  • Question 7
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    A particle of mass \({m}\) and charge \({q}\) is placed at rest in a uniform electric field \(e\) and then released. The kinetic energy attained by the particle after moving distance \(y\) is:

  • Question 8
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    The inertia of a cylinder going through a cylinder center and perpendicular to the axis of the cylinder is \(\mathrm{I}=\mathrm{M}\left(\frac{\mathrm{R}^{2}}{4}+\frac{\mathrm{L}^{2}}{12}\right)\) where \(\mathrm{M}\) is the mass of the cylinder, \(\mathrm{R}\) Is its radius and \(\mathrm{L}\) its length. If a cylinder is made from a substance of a given mass, then the ratio of \(\frac{\mathrm{L}}{\mathrm{R}}\) to the minimum value of its inertia will be:

  • Question 9
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    Mayank is doing an experiment in the lab with a bob of mass 10 Kg and a string of 6 m. He tied a string with the laboratory roof and another end with the bob. He then tied another string at 3 m below the roof with the previous one as shown in the figure. Find the tension T1 in the string? g =10 m/s2

  • Question 10
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    A repeater in a communication system consists of:

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