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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

You can do it
  1. Which of the following characters is not shown by hydrogen
  2. Epoxy resins is used as
  3. Polythene is industrially prepared by the polymerisation of
  4. Old-written material, which cannot be read easily can be read by
  5. The colour of Emerald is
  6. The smallest functional and structural unit of kidney is called as
  7. The property of a substance to absorb moisture from the air on exposure is called
  8. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
  9. The major ingredient of leather is
  10. Pollination by birds is called
  11. The most important ore of Aluminium is
  12. The fastest-running terrestrial animal is
  13. Water has maximum density at
  14. The chemial name of Uria is
  15. The location and energy of an electron in an atom can be specified by
  16. According to Daltons atomic theory the smallest particle which can exist independently is
  17. The speed of light with the rise in the temperature of the medium
  18. The removal of top soil by water or wind is called
  19. The intencity of Earthquakes is measured on
  20. The element present in the largest amount in rocks and minerals is
  21. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  22. Permanent hardness of water can be removed by adding
  23. One fathom is equal to
  24. Brass gets discoloured in air due to the presence of which gas in air
  25. The metal used in storage batteries
  26. Earth's seasons are caused by which of the following?
  27. The Panda belongs to the same family as that of
  28. In an atomic nucleus, neutrons and protons are held together by
  29. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  30. Which of the following elements is obtained from sea weeds ?