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The overhead wires supported by high towers in the grid system carry

A. alternating current of very high frequency

B. alternating current of very high voltage

C. a very large direct current

D. a high voltage direct current

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  1. It is difficult to bon potatoes at the top or a mountain because
  2. The planet that moves fastest around the sun is
  3. The phenomenon of radioactivity was discovered by
  4. The device for tracking and locating the position of a moving object in space is called
  5. It is more difficult to walk on ice than on a concrete road because
  6. A lightning conductor installed in a building
  7. Sound waves
  8. The largest planet in the solar system is
  9. If an empty cylinder Is half ruled with a liquid, Its centre of gravity is
  10. To get 5 images of a single object one should have two plane mirrors inclined at an angle of
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  12. For detecting and, testing of small electric charges we use
  13. Cyclotron is an apparatus used
  14. Primary colours are
  15. The strength of an electromagnet can be increased by
  16. In an oil lamp, holes are provided below the chimney so that
  17. The planet that is known as earth's twin is
  18. Electron-volt is a unit of
  19. In the ramous equation of Einstein E = mc2 , 'c' denotes.
  20. The barometer was invented by
  21. Out of the following which element has the longest half-life period?
  22. Of the following which has got the highest frequency?
  23. The planet that spins Caster than any other planet is
  24. When the resistance of a circuit increases the current will
  25. The completely dark portion of a shadow of an object is known as
  26. If a bar magnet is broken into two pieces
  27. Chronometer la an instrument to measure
  28. The number of electrons in the outer orbits of a nucleus gives
  29. In the visible spectrum which colour has the shortest wavelength?
  30. Changing of one element into another element is known as