The removal of top soil by water or wind is called

A. Soil erosion

B. Soil wash

C. Silting of soil

D. Soil creep

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  1. Which of the following is the lightest metal ?
  2. Earth's seasons are caused by which of the following?
  3. Which of the following is in liquid form at room temperature ?
  4. Nitrification means
  5. The most important ore of Aluminium is
  6. The hardest substance available on earth is
  7. The fastest-running terrestrial animal is
  8. The chemial name of Uria is
  9. The oxide of Nitrogen used in medicine as anaesthetic is
  10. Pollination by birds is called
  11. Polythene is industrially prepared by the polymerisation of
  12. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
  13. Glass is made from the mixture of
  14. The metal used in storage batteries
  15. The speed of light with the rise in the temperature of the medium
  16. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  17. Water has maximum density at
  18. The formula of Plaster of Paris is
  19. Old-written material, which cannot be read easily can be read by
  20. The recent atomic weight scale is based on
  21. The fastest acting enzyme in the biological kingdom is
  22. The marine animal called dugong which is vulnerable to extinction is a/an
  23. Which of the following elements is a metal
  24. Quartz crystals normally used in quartz clocks etc. is chemically
  25. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  26. Epoxy resins is used as
  27. Liquefied Petroleum gas (LPG) consists of mainly
  28. Brass gets discoloured in air due to the presence of which gas in air
  29. The solar eclipse occurs when
  30. The smallest functional and structural unit of kidney is called as