The element present in the largest amount in rocks and minerals is

A. Carbon

B. Hydrogen

C. Aluminium

D. Silicon

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  1. Which of the following elements is obtained from sea weeds ?
  2. When a gas is turned into a liquid, the process is called
  3. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  4. The fastest acting enzyme in the biological kingdom is
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  6. Nitrification means
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  18. The solar eclipse occurs when
  19. Quartz crystals normally used in quartz clocks etc. is chemically
  20. The fastest-running terrestrial animal is
  21. Polythene is industrially prepared by the polymerisation of
  22. The marine animal called dugong which is vulnerable to extinction is a/an
  23. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  24. What is the unit for measuring the pitch or frequency of sound ?
  25. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
  26. The metal used in storage batteries
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