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  1. The hardest substance available on earth is
  2. The intencity of Earthquakes is measured on
  3. In an atomic nucleus, neutrons and protons are held together by
  4. Earth's seasons are caused by which of the following?
  5. The oxide of Nitrogen used in medicine as anaesthetic is
  6. According to Daltons atomic theory the smallest particle which can exist independently is
  7. Polythene is industrially prepared by the polymerisation of
  8. Glass is made from the mixture of
  9. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  10. The formula of Plaster of Paris is
  11. The element present in the largest amount in rocks and minerals is
  12. Which of the following is in liquid form at room temperature ?
  13. Apparatus invented by Archimedes is :
  14. The location and energy of an electron in an atom can be specified by
  15. Rust is
  16. What is the unit for measuring the pitch or frequency of sound ?
  17. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  18. Nitrification means
  19. Liquefied Petroleum gas (LPG) consists of mainly
  20. Which of the following elements is non-radioactive?
  21. The property of a substance to absorb moisture from the air on exposure is called
  22. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
  23. Lightening cause rainfall because
  24. One fathom is equal to
  25. Brass gets discoloured in air due to the presence of which gas in air
  26. The fastest-running terrestrial animal is
  27. The major ingredient of leather is
  28. The marine animal called dugong which is vulnerable to extinction is a/an
  29. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  30. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…