__________ is a special constituent of chlorophyll without which photosynthesis is not possible.

A. Calcium

B. Nitrogen

C. Phosphorous

D. Hydrogen

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  1. Maximum change in the hardness of martensite occurs in the carbon content range of __________ percent…
  2. Temperature attained in soldering of metals is about __________ °C.
  3. The property of material, by which a given amount of energy is absorbed by it, without plastic deformation,…
  4. __________ is not a heat treatment process.
  5. Unbreakable crockeries are made from __________ polymers.
  6. Vernier calipers cannot be used to measure the
  7. Identify the correct statement.
  8. Dowtherm is a
  9. For an ideal gas, Cp - Cv is
  10. Which of the following metals cannot be hot worked at room temperature?
  11. Nitriding of a steel part does not increase its
  12. For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is…
  13. In electrical resistance welding, distortion results from the use of improper
  14. Highest cutting speed is achieved by the __________ tool material.
  15. Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
  16. Boiler tube size is specified by its thickness and __________ diameter.
  17. The following type of bonding is strongly directional in solids.
  18. What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer…
  19. Stresses encountered in the metal forming processes are less than the __________ of the material.
  20. Titanium is added to molten aluminium alloys before casting for the purpose of
  21. Silicon percentage in acid resistant cast iron is about
  22. Pick out the wrong statement.
  23. Earing is a defect found in steels after the following metal working operation.
  24. Increase in temperature, in general results in the
  25. Encyclopaedia of Chemical Technology has been
  26. While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen…
  27. Which of the following contributes maximum as main source of sulphur in the blast furnace charge?
  28. A compact estimate about the amount of materials handling between various work stations is obtained…
  29. In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The…
  30. Steel containing low percentage of nickel, chromium & tungsten are termed as the __________ steel.