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Old-written material, which cannot be read easily can be read by

A. None of these

B. Ultraviolet rays

C. Infra Red rays

D. Cosmic Rays

You can do it yup
  1. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
  2. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  3. Quartz crystals normally used in quartz clocks etc. is chemically
  4. Polythene is industrially prepared by the polymerisation of
  5. Which of the following elements is a metal
  6. The solar eclipse occurs when
  7. The oxide of Nitrogen used in medicine as anaesthetic is
  8. Which of the following characters is not shown by hydrogen
  9. The Panda belongs to the same family as that of
  10. Rust is
  11. Glass is made from the mixture of
  12. Brass gets discoloured in air due to the presence of which gas in air
  13. Which of the following is in liquid form at room temperature ?
  14. The most important ore of Aluminium is
  15. The chemial name of Uria is
  16. Earth's seasons are caused by which of the following?
  17. According to Daltons atomic theory the smallest particle which can exist independently is
  18. One fathom is equal to
  19. The accumulation of stress along the boundaries of lithospheric plates results in which of the following?
  20. The fastest acting enzyme in the biological kingdom is
  21. The smallest functional and structural unit of kidney is called as
  22. Permanent hardness of water can be removed by adding
  23. Water has maximum density at
  24. Which of the following elements is obtained from sea weeds ?
  25. The colour of Emerald is
  26. The element present in the largest amount in rocks and minerals is
  27. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  28. Bromine is
  29. The removal of top soil by water or wind is called
  30. Old-written material, which cannot be read easily can be read by