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The recent atomic weight scale is based on

A. 1H1

B. 1H2

C. 6C12

D. 8O16

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  1. The type of glass used in making prisms and lenses is
  2. Which of the following elements is a metal
  3. Permanent hardness of water can be removed by adding
  4. Which of the following parts of the sun is easily visible only during a total solar eclipse?
  5. The most important ore of Aluminium is
  6. According to Daltons atomic theory the smallest particle which can exist independently is
  7. Earth's seasons are caused by which of the following?
  8. Water has maximum density at
  9. Bromine is
  10. Pollination by birds is called
  11. The oxide of Nitrogen used in medicine as anaesthetic is
  12. The metallic constituents of hard water are
  13. Which of the following elements is obtained from sea weeds ?
  14. Which of the following is commonly called a polyamide ?
  15. Which of the following characters is not shown by hydrogen
  16. Lightening cause rainfall because
  17. The hardest substance available on earth is
  18. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  19. Brass gets discoloured in air due to the presence of which gas in air
  20. What is the unit for measuring the pitch or frequency of sound ?
  21. Polythene is industrially prepared by the polymerisation of
  22. The speed of light with the rise in the temperature of the medium
  23. Nitrification means
  24. The accumulation of stress along the boundaries of lithospheric plates results in which of the following?
  25. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
  26. The removal of top soil by water or wind is called
  27. The intencity of Earthquakes is measured on
  28. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  29. The solar eclipse occurs when
  30. When a gas is turned into a liquid, the process is called