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The hardest substance available on earth is

A. Platinum

B. Quartz

C. gold

D. Diamond

You can do it
  1. The formula of Plaster of Paris is
  2. Water has maximum density at
  3. When a gas is turned into a liquid, the process is called
  4. The speed of light with the rise in the temperature of the medium
  5. Lightening cause rainfall because
  6. Pollination by birds is called
  7. Which of the following elements is non-radioactive?
  8. The type of glass used in making prisms and lenses is
  9. Quartz crystals normally used in quartz clocks etc. is chemically
  10. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  11. The smallest functional and structural unit of kidney is called as
  12. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
  13. Glass is made from the mixture of
  14. The fastest-running terrestrial animal is
  15. Old-written material, which cannot be read easily can be read by
  16. One fathom is equal to
  17. The metal that is present in Photo Films is
  18. According to Daltons atomic theory the smallest particle which can exist independently is
  19. The colour of Emerald is
  20. Cell membrane is
  21. Which of the following is the lightest metal ?
  22. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  23. The Panda belongs to the same family as that of
  24. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  25. The metallic constituents of hard water are
  26. The hardest substance available on earth is
  27. The intencity of Earthquakes is measured on
  28. The accumulation of stress along the boundaries of lithospheric plates results in which of the following?
  29. Which of the following is in liquid form at room temperature ?
  30. Brass gets discoloured in air due to the presence of which gas in air