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Physics Test - ...

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  • Question 1
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    Coulombs force between two point charges varies with distance '\(\mathrm{r}\)' in relation to _________.

  • Question 2
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    If the speed of rotation of earth about its axis increases, then the weight of the body at the equator will ___________.

  • Question 3
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    Which of these relations is wrong?

  • Question 4
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    A cylinder with a movable piston contains 3 moles of hydrogen at standard temperatureand pressure. The walls of the cylinder are made of a heat insulator, and the pistonis insulated by having a pile of sand on it. By what factor does the pressure of thegas increase if the gas is compressed to half its original volume?

  • Question 5
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    The motor of an electric train can give it an acceleration of \(1 ~m/s^{2}\) and its brakes can give it a negative acceleration of \(3 ~m/s^{2}\). The shortest time in which the train can make a trip between two stations \(1350 ~m\) apart is

  • Question 6
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    What would be the pressure inside a small air bubble of \(0.1 mm\) radius situated just below the water surface? (Surface tension of water \(=7.2 \times 10^{-2} N / m\) and atmospheric pressure \(\left.=1.013 \times 10^{5} N / m ^{2}\right)\)

  • Question 7
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    A person travels along a straight road for the first half time with a velocity \(v_{1}\) and for the second half time with a velocity \(v_{2}\). The mean velocity \('V'\) is given by

  • Question 8
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    Due to cold weather a 1m water pipe of cross-sectional area 1cm2 is filled with ice at −10°C. Resistive heating is used to melt the ice.
    Current of 0.5A is passed through 4kOmega resistance. Assuming that, all the heat produced is used for melting, what is the minimum time required?
    [Given, latent heat of fusion for water/ice =3.33×105Jkg−1, specific heat of ice =2×103Jkg−1 and density of ice =103kg∕m3]

  • Question 9
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    When photons of wavelength λ1 are incident on an isolated sphere, the corresponding stopping potential is found to be V. When photons of wavelength λ2 are used, the corresponding stopping potential was thrice that of the above value. If light of wavelength λ3 is used then find the stopping potential for this case.

  • Question 10
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    A body of mass \(0.01 \mathrm{~kg}\) executes SHM about \(x=0\), under the influence of force shown in the figure the period of the SHM is:

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