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ISC Class 12 Physics Solved Question Paper 2006

Short Answer Type

11. What is the power factor of a series LCR circuit ?

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12. For observing Fraunhofer diffraction from a single slit, what type of wave front should be incident on the slit ?

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13. A ray of light falls on a right angled prism ABC (AB = BC) and travels as shown in Fig. below. What is the refractive index of the material of the prism ?

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14. A simple microscope or a magnifying glass with a focal length 5 cm forms an image at the near point of the eye. Find its magnification.

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15. How can a pile of glass plates be used to produce polarised light ?

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16. State two basic differences between primary and secondary rainbows.

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17. A radio transmitter operates on a wavelength of 1500 m at a power of 400 kW. Find the energy of the radio photons in joules.

Energy is given by,

$straight E space equals space hc over straight lambda space space space space equals space fraction numerator 6.6 space straight x space 10 to the power of negative 34 end exponent space straight x space 3 space straight x space 10 to the power of 8 over denominator 1500 end fraction space space space space equals space 1.32 space straight x space 10 to the power of negative 28 end exponent space straight J$