Subject

Physics

Class

ICSE Class 12

Pre Boards

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Sample Papers

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ISC Class 12 Physics Solved Question Paper 2004

Short Answer Type

21. An ionized helium particle (+2e) is situated at the origin (0, 0). How much work is done in taking an electron from x = 3 cm to x = 6 cm?

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22. Given that the resistance of the voltmeter is 400 Ω, find the voltmeter’s reading.

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23. Show that the radius of a charged particle entering perpendicularly in a magnetic field is directly proportional to its momentum.

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24. Find the inductance of a choke coil needed to run an arc lamp, with an a.c. source of 100 V supply at 50 Hz. The arc runs at 10 amp. current and has an effective resistance of 4 Ω.

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25. State any five electromagnetic waves and arrange them in the increasing order of their penetrating power.

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26.

What type of wave front is produced by:

(i) Point source of light (ii) Line source of light

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27. Define dispersive power. The dispersive power of an achromatic doublet is 2/3 and the combined focal length of the combination is 30 cm. Find the focal length of each lens stating its nature.

The ratio of angular dispersion between two colours to the deviation of mean ray produced by the prism is called the dispersive power of material of the prism for those colours.

straight w space equals space fraction numerator straight n subscript straight v space minus space straight n subscript straight f over denominator straight n subscript straight y space minus space 1 end fraction straight w over straight w subscript 1 space equals space fraction numerator negative straight f over denominator straight f subscript 1 end fraction where space straight w space equals space space 2 space and space straight w subscript 1 space equals space 3 space 2 over 3 space equals space fraction numerator negative straight f over denominator straight f subscript 1 end fraction fraction numerator negative 2 straight f over denominator 3 end fraction space equals space straight f subscript 1 straight f subscript 1 space equals space fraction numerator negative 2 straight f over denominator 3 end fraction 1 over straight f space equals space 1 over straight f space plus space 1 over straight f subscript 1 1 over straight f space equals space 1 over straight f space plus space fraction numerator 1 over denominator straight f apostrophe end fraction 1 over 30 space equals space fraction numerator 1 over denominator straight f apostrophe end fraction space minus space fraction numerator 3 over denominator 2 straight f apostrophe end fraction 1 over 30 space equals space fraction numerator negative 1 over denominator 2 straight f apostrophe end fraction straight f space equals space straight f apostrophe space equals space minus 15 space cm Since space focal space length space is space negative comma space the space lens space is space concave space lens. space straight f subscript 1 space equals space 4 space minus space 2 over 3 straight f apostrophe space equals space 10 space cm Nature space equals space Convex space lens

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28.

Calculate the focal length of a concave lens with the help of the above ray diagram. Focal length of convex lens is 20 cm.

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29.

A fish is located at a distance of 10 cm from the wall of a fish pond. The thickness of the glass wall is 2 cm. Find the apparent position of the fish. (Given

_aμ_g = 3/2 and _aμ_w= 4/3)

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