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How are microwaves produced?...

How are microwaves produced?

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Using Magnetron valve or Klystron valve.
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XII BOARD PREVIOUS YEAR PAPER ENGLISH-XII BOARDS-SET-III
  1. Two thin lenses of power +5 D and -2.5 D are in contact. What is the f...

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  2. How would the angular separation of interence fringes in Young's doubl...

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  3. Give the logic symbol of AND gate.

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  4. Two nuclei have mass numbers in the ratio 27 : 125. What is the ratio...

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  5. (i) What is the relation between critical angle and refractive index o...

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  6. A wire of 20 Omega resistance is gradually stretched to double its ori...

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  7. What are polaroids ? Mention some of their practical uses ?

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  8. Define the activity of a radio nuclide. Write its S.I. unit. Give a pl...

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  9. A hollow metal sphere of radius 6 cm is charged such that the potentia...

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  10. How are microwaves produced?

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  11. A converging lens has a focal length of 20 cm in air. It is made of a ...

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  12. Two charges of magnitudes +4Q and -Q and located at points (a, 0) and ...

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  13. A parallel beam of light of 450 nm falls on a narrow slit and the resu...

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  14. Name the type of waves which are used for line of sight (LOS) communic...

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  15. Why do the electric field lines never cross each other ?

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  16. To which part of the electromagnetic spectrum does a wave of frequency...

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  17. Estimate the average drift velocity of conduction electrons in a coppe...

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  18. Write the functions of the following in communication systems: (i). ...

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  19. A convex lens of focal length 20cm is placed coaxilly with a convex mi...

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  20. (a) A rod of length l is moved horizontal with a uniform velocity v in...

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