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The type of glass used in making prisms and lenses is

A. Pyrex glass

B. Soft glass

C. Flint glass

D. Jena glass

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  1. Old-written material, which cannot be read easily can be read by
  2. Lightening cause rainfall because
  3. One fathom is equal to
  4. Water has maximum density at
  5. The colour of Emerald is
  6. According to Daltons atomic theory the smallest particle which can exist independently is
  7. The removal of top soil by water or wind is called
  8. The metal that is present in Photo Films is
  9. The accumulation of stress along the boundaries of lithospheric plates results in which of the following?
  10. The element present in the largest amount in rocks and minerals is
  11. The major ingredient of leather is
  12. The location and energy of an electron in an atom can be specified by
  13. Which of the following is commonly called a polyamide ?
  14. Permanent hardness of water can be removed by adding
  15. The metal used in storage batteries
  16. Rust is
  17. Pollination by birds is called
  18. Epoxy resins is used as
  19. When a gas is turned into a liquid, the process is called
  20. Apparatus invented by Archimedes is :
  21. Which of the following parts of the sun is easily visible only during a total solar eclipse?
  22. The recent atomic weight scale is based on
  23. Which of the following elements is obtained from sea weeds ?
  24. Liquefied Petroleum gas (LPG) consists of mainly
  25. Polythene is industrially prepared by the polymerisation of
  26. Bromine is
  27. The chemial name of Uria is
  28. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  29. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  30. The intencity of Earthquakes is measured on