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ISC Class 12 Physics Solved Question Paper 2006

Short Answer Type

31. Name the essential parts of a spectrometer.

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32.
(i) Draw a ray diagram to show how the image of a distant object is formed by a refracting astronomical telescope when in normal use.

(ii) State one advantage of a reflecting astronomical telescope over a refracting astronomical telescope.

i)

Magnification, M =

ii) Advantage of reflecting astronomical telescope over a refracting astronomical telescope: a lens produces chromatic aberration but such aberration is absent in the case of reflectors

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33. The refractive indices of a material for red, violet and yellow colour lights are 1.52. 1.62 and 1.59 respectively. Calculate the dispersive power of the material. If the mean deviation is 40°, what will be the angular dispersion produced by a prism of this material ?

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34. What is the cause of spherical aberration in lenses? State a method to minimise this defect.

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35. In a Cathode ray tube, an electron passes through a field, where the electric field E and the magnetic field B are uniform and mutually perpendicular. Derive an expression for the velocity at which the electron reaches the screen undeflected.

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36.

(i) What is meant by the term activity of a radioactive substance.

(ii) A radioactive sample has a half life of 1.4 x 10¹⁶ seconds and a mass number of 238. Calculate the number of disintegration/s of 1g of this sample.

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