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Physics Test - ...

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  • Question 1
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    Of the following quantities, which one has dimensions different from the remaining three:

  • Question 2
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    Which of the following material has the highest relative permittivity?

  • Question 3
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    A T.V. tower has a height of 100 m. The population which is covered by T.V. broadcast, if the average population density around the tower is 1000/ km2 will be –

  • Question 4
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    Light is polarized to the maximum when it is incident on a glass surface at an angle of incidence:

  • Question 5
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    A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of water in the capillary tube is 5 g. Another capillary tube of radius 2r is immersed in water. The mass of water, that will rise in this tube, is:

  • Question 6
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    Hysteresis loops for two magnetic materials \(\mathrm{A}\) and \(\mathrm{B}\) are as given below:

    These materials are used to make magnets for electric generators, transformer core and electromagnet core. Then, it is proper to use:

  • Question 7
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    The energy required to transfer an electron from second Bohr orbit to third Bohr orbit in a hydrogen like atom with nuclear charge \(Z_{e}\) is \(6.8 \mathrm{eV}\).The wavelength of radiation required to shift the electron from first orbit to infinite orbit will be :

  • Question 8
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    In stopping potential (V) photo current (I) graph, if \(\mathrm{V}_{2}>\mathrm{V}_{1}\), then compare the wavelengths of incident radiations:

  • Question 9
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    Assume that the silicon diode in the circuit requires a minimum current of \(1mA\) to be above the knee point \(0.7 V\) of its \(I-V\) characteristics. Also, assume that the voltage across the diodes is independent of the current above the knee point. If \(V_{B} = 5V\) what should be the maximum value of \(R\) so that the voltage is above the knee point?

  • Question 10
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    A toy car with charge \(\mathrm{q}\) moves on a frictionless horizontal plane surface under the influence of a uniform electric field \(\mathrm{\vec{E}}\). Due to the force \(\mathrm{q \; \vec{E},}\) its velocity increases from \(0\) to \(\mathrm{6 m / s}\) in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between \(0\) to \(3\) seconds are respectively.

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