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Physics Test 29...

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  • Question 1
    4 / -1

    For two concentric circular coils with radii r1 ≪ r2, the mutual inductance M is proportional to:

  • Question 2
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    The angular momentum of an electron in Bohr's hydrogen atom whose energy is −3.4 eV, is

  • Question 3
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    A charged soap bubble having surface charge density σ and radius r. If the pressure inside and outside the soap bubble is the same, then the surface tension of the soap solution is

  • Question 4
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    If the radius of the earth becomes half of its present value (mass remaining the same), the new duration of the day would be

  • Question 5
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    A  200 pF capacitor is charged to 10 μC. What is the total energy stored in the capacitor?

  • Question 6
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    A mass m is connected between two identical springs, each with a spring constant k. The other ends of the springs are attached to fixed walls. Assuming the springs are aligned horizontally and the mass is on a frictionless surface, what is the effective spring constant of the system

  • Question 7
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    Which among the following has a Hydrogen-like spectrum and whose lines have wavelengths four times shorter than those of atomic Hydrogen?

  • Question 8
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  • Question 9
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    There is some change in length when a 33000 N tensile force is applied on a steel rod of the area of cross-section 10−3 m2.

    The change of temperature required to produce the same elongation, if the steel rod is heated, is

    (The modulus of elasticity is 3 × 1011 N m−2 and the coefficient of linear expansion of steel is 1.1 × 10−5 ∘C−1)

  • Question 10
    4 / -1

    The pressure and volume of a given mass of gas at a given temperature are P and V respectively. Keeping the temperature constant, the pressure is increased by 10 and the system is allowed to achieve a steady-state, then the pressure is decreased by 10. What can be said about the final volume?

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