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. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  2. The property of a substance to absorb moisture from the air on exposure is called
  3. Nitrification means
  4. Water has maximum density at
  5. Which of the following elements is obtained from sea weeds ?
  6. The fastest-running terrestrial animal is
  7. Cell membrane is
  8. Apparatus invented by Archimedes is :
  9. Pollination by birds is called
  10. Which of the following is in liquid form at room temperature ?
  11. The recent atomic weight scale is based on
  12. The solar eclipse occurs when
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  14. Polythene is industrially prepared by the polymerisation of
  15. The hardest substance available on earth is
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  17. Epoxy resins is used as
  18. Which of the following is commonly called a polyamide ?
  19. The marine animal called dugong which is vulnerable to extinction is a/an
  20. The type of glass used in making prisms and lenses is
  21. Rust is
  22. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
  23. The major ingredient of leather is
  24. The metal used in storage batteries
  25. Which of the following parts of the sun is easily visible only during a total solar eclipse?
  26. The metal that is present in Photo Films is
  27. Which of the following is the lightest metal ?
  28. Earth's seasons are caused by which of the following?
  29. The element present in the largest amount in rocks and minerals is
  30. Old-written material, which cannot be read easily can be read by