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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. Earth's seasons are caused by which of the following?
  2. The element present in the largest amount in rocks and minerals is
  3. The property of a substance to absorb moisture from the air on exposure is called
  4. What is the unit for measuring the pitch or frequency of sound ?
  5. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  6. Brass gets discoloured in air due to the presence of which gas in air
  7. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
  8. The accumulation of stress along the boundaries of lithospheric plates results in which of the following?
  9. The intencity of Earthquakes is measured on
  10. The type of glass used in making prisms and lenses is
  11. The recent atomic weight scale is based on
  12. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  13. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
  14. The most important ore of Aluminium is
  15. Liquefied Petroleum gas (LPG) consists of mainly
  16. The solar eclipse occurs when
  17. Pollination by birds is called
  18. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  19. Quartz crystals normally used in quartz clocks etc. is chemically
  20. The metal used in storage batteries
  21. Which of the following parts of the sun is easily visible only during a total solar eclipse?
  22. Which of the following elements is a metal
  23. The marine animal called dugong which is vulnerable to extinction is a/an
  24. In an atomic nucleus, neutrons and protons are held together by
  25. Cell membrane is
  26. The metallic constituents of hard water are
  27. The formula of Plaster of Paris is
  28. The removal of top soil by water or wind is called
  29. Lightening cause rainfall because
  30. Permanent hardness of water can be removed by adding