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ISC Class 12 Physics Solved Question Paper 2009

Short Answer Type

1. Explain the statement ‘Relative permittivity of water is 81’

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2. Draw (at least three) electric lines of force due to an electric dipole.

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3. Find the value of resistance X in the circuit below so that the junctions M and N are at the same potential:

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4. When the cold junction of a certain thermo-couple was maintained at 20°C, its neutral temperature was found to be 180°C. Find its temperature of inversion.

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5. State how the magnetic susceptibility of a ferromagnetic material changes when it is heated.

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6. What is the value of power factor in a series LCR circuit at resonance?

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7. An a.c. generator generates an emf ‘e’ given by: e = 311 Sin (100 πt) volt. Find the rms value of the emf generated by the generator.

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8. A ray LM of monochromatic light incident normally on one refracting surface AB of a regular glass prism ABC emerges in air from the adjacent surface AC as shown in Figure 2. Calculate the refractive index of the material of the prism.

Since, it is a regular glass prism.

So ∠A = 60°

∴ ∠MNP = 60°

Refractive index μ of the prism is given by,

sin $angle MNP space equals space 1 over straight mu$
$straight mu space equals space fraction numerator 1 over denominator sin space 60 to the power of straight o end fraction straight mu space equals space fraction numerator 1 over denominator square root of 3 divided by 2 end fraction space equals space fraction numerator 2 over denominator square root of 3 end fraction$

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9. Describe the absorption spectrum of Sodium.

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10. A thin converging lens of focal length 15 cm is kept in contact with a thin diverging lens of focal length 20 cm. Find the focal length of this combination.

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