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ISC Class 12 Physics Solved Question Paper 2011

Short Answer Type

31.

A certain monochromatic light travelling in air is incident on a glass plate at a polarising angle. Angle of refraction in glass is found to be 32°. Calculate :

(i) the polarising angle;

(ii) refractive index, of glass.

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32. Calculate angle of minimum deviation (δ_m) for a regular glass prism. (Refractive index of glass = 1-6)

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33. Obtain an expression for refraction at a single convex spherical surface, i.e., the relation between μ₁ (rarer medium), μ₂ (denser medium), the object distance u, image distance v and radius of curvature R.

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34. Where should an object be kept on the principal axis of a convex lens of focal length 20 cm, in order to get an image, which is double the size of the object ?

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35.

(i) What is the use of a spectrometer ?

(ii) In a spectrometer, what is the function of:

(1) Collimator ?

(2) Telescope ?

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36.

Draw a labelled diagram of an image formed by a compound microscope with image formed at least distance of distinct vision.

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37.

An astronomical telescope consists of two thin convex lenses having focal lengths of 140 cm and 5 cm. The telescope is adjusted to be in normal adjustment,

(i) What is the angular magnification, i.e., magnifying power of the telescope in this set up ?

(ii) What is the distance between the two lenses equal to ?

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38. State two important conclusions that can be drawn from Millikan’s oil drop experiment to determine the charge of an electron.

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39.

A monochromatic source of light emits light of wavelength 198 nm. Calculate :

(i) energy of each photon;

(ii) Momentum of the photon.

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40.
(i) Name a series of lines of hydrogen spectrum which lies in :

(1) Visible region

(2) Ultra violet region

(ii) Write Bohr’s formula to calculate wavelength (X) of visible light, emitted by hydrogen, and explain the meaning of each and every symbol used.

(i) (1) Visible region → Balmer series

(2) Ultra violet region → Lyman Series

(ii) Bohr’s formula is given by,

$1 over straight lambda space equals space n squared space R open parentheses space 1 over n subscript 1 squared space minus space 1 over n subscript 2 squared close parentheses F o r space h y d r o g e n comma space n space equals space 1 1 over lambda space equals space R space open parentheses 1 over n subscript 1 squared space minus 1 over n subscript 2 squared space close parentheses$