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ISC Class 12 Physics Solved Question Paper 2012

Short Answer Type

11. Which electromagnetic radiation has wavelength greater than that of X rays and smaller than that of visible light?

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12. How did Fresnel construct a biprism in order to study interference of light?

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13. State Brewster’s law of polarisation of light.

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14. A thin convex lens (L₁) of focal length 80 cm and a thin concave lens (L₂) of focal length f are kept co-axially, 20 cm apart as shown in figure 3 below. When a narrow and parallel beam of light is incident on the convex lens, bean emerging fron the concave lens is also a parallel beam. Find f.

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15. What condition must be satisfied by two thin lenses kept in contact so that they form an achromatic doublet, i.e. a combination free from chromatic aberration ?

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16. Threshold frequency of a certain metal for photo-electric emission is 5x10¹⁴Hz. Calculate its work function.

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17. What conclusion was drawn by Rutherford based on Geiger-Marsden’s experiment on scattering of alpha particles?

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18. Write a balanced nuclear reaction showing emission of a β- particle by 90Th²³⁴ (Symbol of daughter nucleus formed in the process is Pa.)

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19.
What is the essential difference between the working of a nuclear reactor and that of a fission bomb?

In a nuclear reactor energy released is controlled that is by the use of neutron absorbing material such as Cadmium, where as in a fission bomb their is no control in the amount of energy released.

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