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Physics Test 20...

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  • Question 1
    4 / -1

    If the binding energy of an electron in a hydrogen atom is 13.6 eV, then the energy required to remove the electron from the first excited state of Li++ is

  • Question 2
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    Directions For Questions

    Consider a block of conducting material of resistivity ρ shown in the figure. Current I enters the material at A and leaves from D. We apply the superposition principle to find the voltage ΔV developed between B and C. The calculation is done in the following steps.

    (i) Take current I entering from A and assume it to spread over a hemispherical surface in the block.

    (ii) Calculate field E(r) at a distance r from A by using Ohm's law, E = ρj, where j is the current per unit area at r.

    (iii) From r dependence of E(r), obtain the potential V(r) at r.

    (iv) Repeat (i), (ii) and (iii) for the current I, leaving D and superimpose results for A and D.

    ...view full instructions

    For current entering at A, the electric field at a distance r from A is

  • Question 3
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    A parallel plate air-filled capacitor has a capacitance of 2 μF . When it is half-filled with a dielectric of dielectric constant k = 3, its capacitance becomes

  • Question 4
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    A coil having n turns and resistance RΩ is connected with a galvanometer of resistance 4RΩ. This combination is moved in time t seconds from a magnetic field W1 weber to W2 weber. The induced current in the circuit is

  • Question 5
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    Which of the following relations is/are correct?

  • Question 6
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    The ratio of the speed of sound in nitrogen gas to that in helium gas, at 300 K, is

  • Question 7
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    A cannon on a level plain is aimed at an angle α above the horizontal and a shell is fired with a muzzle velocity v0 towards a vertical cliff, a distance R away. The height from the bottom at which the shell strikes the side walls of the cliff is

  • Question 8
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    Directions: This question has Statement-I and Statement-II. Of the four choices given after the statements, choose the one that best describes the two statements.

    Statement-I: Higher the range, greater is the resistance of ammeter.

    Statement-II: To increase the range of ammeter, additional shunt needs to be used across it.

  • Question 9
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    The two physical quantities among the following which don't have the same dimensions are

  • Question 10
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    A particle falls from a height 'h' on a fixed horizontal plane and rebounds. If 'e' is the coefficient of restitution, the total distance travelled by the particle before it stops is

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