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Physics Test - ...

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  • Question 1
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    The electron in a hydrogen atom makes a transition \(\mathrm{n}_{1} \rightarrow \mathrm{n}_{2},\) where \(\mathrm{n}_{1}\) and \(\mathrm{n}_{2}\) are the principal quantum numbers of the two energy states. Assume Bohr's model to be valid. The time period of the electron in the initial state is eight times that in the final state. What are the possible values of \(\mathrm{n}_{1}\) and \(\mathrm{n}_{2} ?\)

  • Question 2
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    The correct Boolean operation represented by the circuit diagram drawn is :

  • Question 3
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    Two different metals are joined end to end. One end is kept at constant temperature and the other end is heated to a very high temperature. The high depicting the thermo emf is:

  • Question 4
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    A toroidal solenoid has 3000 turns and a mean radius of 10cm. It has a soft iron core of relative permeability 2000. What is the magnitude of the magnetic field in the core, when a current of 1A is passed through the solenoid?

  • Question 5
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    A board is balanced on a rough horizontal semi-circular log. Equilibrium is obtained with the help of addition of a weight to one of the ends of the board when the board makes an angle θ with the horizontal. Coefficient of friction between the log and the board is:

  • Question 6
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    A thin circular ring of mass \(M\) and radius \(R\) rotates about an axis through its centre and perpendicular to its plane, with a constant angular velocity \(ω\). Four small particles each of mass \(m\) (negligible radius) are kept gently to the opposite ends of two mutually perpendicular diameters of the ring. The new angular velocity of the ring will be

  • Question 7
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    If momentum \( (p) \), area \( (A) \) and time \( (T) \) are taken to be fundamental quantities, then energy has the dimensional formula:

  • Question 8
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    If a box of mass 25 kg is pushed 15 m by a force of ‘F’ N and work done in the process is 480 J. Find F:

  • Question 9
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    Diagram shows a bar magnet and two infinite long wires W1 and W2 carrying equal currents in opposite directions. The magnet is free to move and rotate. P is the mid-point of magnet. For this situation mark out the correct statement(s).

  • Question 10
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    If number of neutrons become more than the number of electrons in the element then it will become:

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