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Physics Test 136

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Physics Test 136
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  • Question 1
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    Solution

     

  • Question 2
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    The temperature at which proton in hydrogen gas would have enough energy to overcome a barrier of  is (Boltzmann constant = )

    Solution

     

  • Question 3
    4 / -1

    A simple pendulum attached to the ceiling of a stationary lift has a time period T. The distance y covered by the lift moving upwards varies with time t as y = twhere y is in meters and t in seconds. If g = 10m / s2, the time period of pendulum will be

    Solution

    Distance travelled by lift id given by

    Y=t2

     

  • Question 4
    4 / -1

    The transverse displacement y (x, t) of a wave on a string is given by This represents a:

    Solution

     

  • Question 5
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    A semi-circular arc of radius ‘a’ is charged uniformly and the charge per unit length is λ. The electric field at the center of this arc is

    Solution

     

  • Question 6
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    Identify the false statement.

    Solution

     

     

  • Question 7
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    If voltage across a bulb rated 220 Volt-100 Watt drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is:

    Solution

     

  • Question 8
    4 / -1

    Two tangent galvanometers A and B have coils of radii 8 cm and 16 cm respectively and having resistance of  each. They are connected in parallel with a cell of emf 4V and negligible internal resistance. The deflections produced in the tangent galvanometers A and B are 30° and 60° respectively. If A has 2 turns, then B must have

    Solution

     

  • Question 9
    4 / -1

    If the susceptibility of diamagnetic, paramagnetic and ferromagnetic materials are  respectively, then

    Solution

     

  • Question 10
    4 / -1

    Figure shows a conducting rod of negligible resistance that can slide on smooth U-shaped rail made of wire of resistance  Position of the conducting rod at t = 0 is shown. A time t dependent magnetic field B = 2t tesla is switched on at t = 0.

    At t = 0, when the magnetic field is switched on, the conducting rod is moved to the left at constant speed 5cm/ s by some external means. The rod moves perpendicular to the rails. At t = 2s, induced emf has magnitude

    Solution

     

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