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. One fathom is equal to
  2. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  3. Which of the following is the lightest metal ?
  4. Epoxy resins is used as
  5. The element present in the largest amount in rocks and minerals is
  6. The fastest acting enzyme in the biological kingdom is
  7. The Panda belongs to the same family as that of
  8. Lightening cause rainfall because
  9. According to Daltons atomic theory the smallest particle which can exist independently is
  10. The fastest-running terrestrial animal is
  11. Which of the following parts of the sun is easily visible only during a total solar eclipse?
  12. Earth's seasons are caused by which of the following?
  13. Polythene is industrially prepared by the polymerisation of
  14. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  15. Rust is
  16. Water has maximum density at
  17. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
  18. Glass is made from the mixture of
  19. The property of a substance to absorb moisture from the air on exposure is called
  20. The chemial name of Uria is
  21. The major ingredient of leather is
  22. The recent atomic weight scale is based on
  23. The type of glass used in making prisms and lenses is
  24. The colour of Emerald is
  25. When a gas is turned into a liquid, the process is called
  26. The speed of light with the rise in the temperature of the medium
  27. Permanent hardness of water can be removed by adding
  28. The marine animal called dugong which is vulnerable to extinction is a/an
  29. Which of the following elements is a metal
  30. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of