Holography is the technique of

A. taking photos of various objects

B. recording and reproducing three dimensional images

C. tracing out planets and stars in the sky

D. transmitting light waves

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  2. The end product in the uranium disintegration series is
  3. When we sweat, we feel comfortable under a fan because
  4. The electroplating of a metallic article
  5. The planet that has got a well-developed set of rings is
  6. The cell that can be recharged, after it has run down, by passing a direct current through it from a…
  7. Photo-electric cells convert
  8. A pair of stars that revolve round each other is
  9. We cannot see and without the aid of a telescope
  10. At temperature near OK, (zero kelvin) metals such as lead and tin become
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  12. The cover of a solar cooker is made of glass because
  13. Changing of one element into another element is known as
  14. In a concert hall reverberation is controlled by
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  16. Isotones are species of atoms containing
  17. The principle on which a Jet engine works is
  18. A bolometer is used to measure
  19. When one enters a dark room after being in bright light one is not able to see anything clearly for…
  20. An electric fan converts
  21. A temperature below absolute zero for an ideal gas
  22. The line on earth's surface passing through the places having zero dip is called the magnetic equator.…
  23. Meteors
  24. The colour or an opaque object is due to the colour it
  25. Formation of shadows can be explained by
  26. The pressure of air at high altitude is less than the atmospheric pressure at the sea level. Hence the…
  27. The speed at which light travels in vacuum is
  28. Cosmic rays are
  29. Out of the following which element has the longest half-life period?
  30. The speed of light is minimum while passing through