general science

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  1. The purest form of iron is wrought iron .
  2. Graphite is used as a lubricant .
  3. Ammonia gases is lighter than air .
  4. Hydrogen is the lightest gas .
  5. Alnico alloys is used for making magnets .
  6. Heavy water is deuterium oxide .
  7. Caustic soda is NaOH .
  8. Non stick cooking utensils are coated with teflon .
  9. The chemical name for urea is carbamide .
  10. Mica is a bad conductor of electricity but a good conductor of heat .
  11. Graphite is used in pencils .
  12. Bleaching powder is made from lime and chlorine .
  13. Water has maximum density at 4 degree celsius .
  14. The metal using in storage batteries is lead .
  15. Sodium metal is kept under kerosene .
  16. An alloy used in making heating elements for electric heating devices is nichrome .
  17. German silver is an alloy of zinc, copper and nickel .
  18. Diamond is an allotropic form of carbon .
  19. Sea water is the best conductor of electricity .
  20. Balloons are filled with helium .
  21. The gas used to extinguish fire, is carbon dioxide .
  22. The element common to all acids is hydrogen .
  23. Gobar gas contains mainly methane .
  24. Sulphur is used in beauty parlours for hair setting .
  25. Nitrous oxide is laughing gas .
  26. Red phosphorous is used in safety matches .
  27. Stainless steel is an alloy of iron, chromium and nickel ..
  28. Copper metals was first discovered by man .
  29. Marsh gas is methane .
  30. Galvanised iron sheet have a coating of zinc .
  31. Titanium is called a strategic metal .
  32. Liquefied Petroleum Gas consists of mainly methane, butane and propane .
  33. Soda water contains carbon dioxide .
  34. The element required for solar energy conversion is silicon .
  35. The hardest substance available on earth is Diamond .
  36. The ratio of pure gold in 18 carat gold is 75% .
  37. The element found on the surface of the moon is titanium .
  38. The main constituents of pearls are calcium carbonate and magnesium carbonate .
  39. The inert gas which is substituted for nitrogen in the air, used by deep sea divers breathing, is helium .
  40. Mesons are found in Cosmic rays .
  41. Red colour in the visible spectrum has maximum range .
  42. Quartz crystals normally used in quartz clocks etc. is chemically silicon dioxide .
  43. The gas that usually causes explosions in coal mines is methane .
  44. In fireworks, the green flame is produced because of barium .
  45. Plutonium-239 is a good nuclear fuel .
  46. Long distance photography is facilitated by Infrared rays .
  47. Liquid sodium is used as a coolant in nuclear reactors .
  48. Atoms bomb is based on the principle of nuclear fusion and nuclear fission .
  49. Atoms are composed of electrons and nuclei .
  50. One horse power is equal to 746 watts .


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