The extremely luminous objects located at the centre of some distant galaxies and which are sources of high energy electromagnetic radiation are known as

A. Nebulae

B. Quasars

C. Meteors

D. Comets

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  1. The acoustical quality of a room depends on
  2. Frictional force acts in
  3. The principle of equivalence of mass and energy was established by
  4. Enriched uranium means
  5. The barometer was invented by
  6. Primary colours are
  7. An electric charge is measured in
  8. A simple mercury barometer is found in a slightly slanting position. The atmospheric pressure
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  16. The instrument used to measure atmospheric pressure is
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  18. The extremely luminous objects located at the centre of some distant galaxies and which are sources…
  19. The enormous energy released in nuclear and thermonuclear reactions is due to conversion of
  20. Compared to the atomic bomb, the destructive power of a hydrogen bomb is
  21. The mass number and the atomic number of an element are X and Y respectively. The number oC neutrons…
  22. A device used to measure heights above sea level is known as
  23. Which of the following pairs is not correct?
  24. Increase in pressure
  25. In a hydraulic pressure
  26. Photoelectric cell is a device which converts
  27. Photo-electric cells convert
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  29. Radio waves sent out by radio stations are reflected by
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