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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
  1. The oxide of Nitrogen used in medicine as anaesthetic is
  2. The metal used in storage batteries
  3. Which of the following parts of the sun is easily visible only during a total solar eclipse?
  4. The marine animal called dugong which is vulnerable to extinction is a/an
  5. The speed of light with the rise in the temperature of the medium
  6. The major ingredient of leather is
  7. The solar eclipse occurs when
  8. What is the unit for measuring the pitch or frequency of sound ?
  9. The property of a substance to absorb moisture from the air on exposure is called
  10. Cell membrane is
  11. Bromine is
  12. Pollination by birds is called
  13. Which of the following characters is not shown by hydrogen
  14. Old-written material, which cannot be read easily can be read by
  15. Which of the following is commonly called a polyamide ?
  16. The chemial name of Uria is
  17. The most important ore of Aluminium is
  18. Brass gets discoloured in air due to the presence of which gas in air
  19. The metallic constituents of hard water are
  20. Quartz crystals normally used in quartz clocks etc. is chemically
  21. Liquefied Petroleum gas (LPG) consists of mainly
  22. The accumulation of stress along the boundaries of lithospheric plates results in which of the following?
  23. According to Daltons atomic theory the smallest particle which can exist independently is
  24. The fastest acting enzyme in the biological kingdom is
  25. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  26. Which of the following elements is a metal
  27. When a gas is turned into a liquid, the process is called
  28. Which of the following elements is non-radioactive?
  29. The intencity of Earthquakes is measured on
  30. Polythene is industrially prepared by the polymerisation of