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Plants produce carbohydrates from the CO2 present in the atmosphere by

A. Polymerisation

B. Photochemical reaction

C. Oxidation

D. None of these

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  3. Leakage in a cooking gas cylinder is detected by
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  15. Addition of silicon to cast iron
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  17. A jet engine turbine blade is normally manufactured by
  18. Brinell Hardness Number (BHN) for talc is approximately in the range of
  19. Sudden fall of atmospheric pressure by a large amount is an indication of the
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  21. Which of the following forces does not act on a fluid at rest?
  22. Hydro-cyclone is a
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