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Glass is made from the mixture of

A. Quartz and mica

B. Sand and salt

C. Sand and silicates

D. None of these

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  1. The marine animal called dugong which is vulnerable to extinction is a/an
  2. What is the unit for measuring the pitch or frequency of sound ?
  3. Quartz crystals normally used in quartz clocks etc. is chemically
  4. Which of the following elements is non-radioactive?
  5. The element present in the largest amount in rocks and minerals is
  6. The property of a substance to absorb moisture from the air on exposure is called
  7. Which of the following is the lightest metal ?
  8. Pollination by birds is called
  9. Liquefied Petroleum gas (LPG) consists of mainly
  10. Which of the following elements is a metal
  11. Lightening cause rainfall because
  12. Rust is
  13. When a gas is turned into a liquid, the process is called
  14. The recent atomic weight scale is based on
  15. Earth's seasons are caused by which of the following?
  16. The hardest substance available on earth is
  17. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  18. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
  19. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  20. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  21. The fastest acting enzyme in the biological kingdom is
  22. The oxide of Nitrogen used in medicine as anaesthetic is
  23. Glass is made from the mixture of
  24. Water has maximum density at
  25. Apparatus invented by Archimedes is :
  26. The chemial name of Uria is
  27. Which of the following is commonly called a polyamide ?
  28. The fastest-running terrestrial animal is
  29. The solar eclipse occurs when
  30. Permanent hardness of water can be removed by adding