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.

When frequency increases then penetrating power of the electromagnetic waves is increased :

(i) Radio waves - 3 x 10⁹ Hz -3 x 10⁴ Hz

(ii) Microwaves - 3 x 10¹¹ Hz - 1 x 10⁹ Hz

(iii) Infrared waves - 4 x 10¹⁴ Hz - 6 x 10¹⁰ Hz

(iv) UV waves - 3 x 10¹⁶ Hz -8 x 10¹⁴ Hz

(v) X-rays - 3 x 10¹⁹ Hz - 1 x 10¹⁶ Hz

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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.

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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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