Electrometallurgical methods of metal extraction is normally used for those metals

A. Whose oxide/ore is not reduced by carbon

B. Which fall in the category of alkali & alkaline earth metals

C. Which stands higher in the electrochemical series of the metal

D. All (A), (B) & (C)

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

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  1. Which of the following can be manufactured using powder metallurgy techniques?
  2. Heat release during phase change is observed in case of a/an
  3. __________ property of a material is determined by the Herbert Pendulum device.
  4. __________ of grey cast iron produces white cast iron.
  5. Pearlite comprises of
  6. Which of the following gases cause global warming?
  7. Metalloids
  8. Air-petrol ratio in an automotive petrol engine is around
  9. Surface tension of a liquid
  10. In Imperial Smelting Process for extraction of zinc, zinc vapour thus produced is quenched in the external…
  11. Large scale fire on fuel gas line is normally extinguished by
  12. Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air…
  13. Magnetic permeability of iron is increased by its
  14. A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C.…
  15. Which of the following is not the function of a volute casing provided in a centrifugal pump?
  16. Cold cracking in the heat affected zone of a high strength steel weld can take place because of the
  17. Out of the following, the most malleable material is
  18. Which of the following is the most suitable material of construction for the condenser tubes, where…
  19. Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same…
  20. The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.
  21. Drills are usually made of
  22. Thermit welding is categorised as the __________ welding.
  23. Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.
  24. Out of the following __________ iron has the best capability to bear sudden & excessive shocks.
  25. The rolling process cannot be used to produce
  26. Iron content in Indian iron ore is about __________ percent.
  27. Which of the following mainly decides the current to be employed is arc welding?
  28. Propulsion of rocket follows from the
  29. One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C).…
  30. __________ are normally subjected to sub-zero treatment.