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Which of the following is not an ore of copper?

A. Cryolite

B. Azurite

C. Chalcopyrite

D. Malachite

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

You can do it
  1. Reduction in the grain size reduces the __________ of the material.
  2. Dew point temperature always gives an indication of the __________ of the moist air.
  3. Auto collimator is used to check
  4. X-rays are
  5. Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be…
  6. The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.
  7. Fire in fuel gas pipelines is extinguished most effectively by
  8. Which of the, following is not associated with the functioning of a petrol engine?
  9. Force between the molecules of the same substance is called __________ force.
  10. Basicity of the slag in Indian blast furnace is in the range of
  11. Carbon supply in pack carburising process is in the form of
  12. Laser is a device to produce
  13. Which of the following heat treatment processes is usually applied to castings?
  14. Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e.…
  15. Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution
  16. Upto the critical radius of insulation, added insulation, will
  17. Water flow in the river during flood can be categorised as the __________ flow.
  18. To counteract the bad effects of strain hardening on a cold formed part, it must be
  19. In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular…
  20. Venturimeter is used to measure the flow rate of fluids in pipes, when the pipe is in __________ position.
  21. Thermit welding uses the following energy source.
  22. Good design of the casing of a centrifugal pump aims at minimising the
  23. The life of a ball bearing is inversely proportional to
  24. Consideration of the creep is the most important in case of the
  25. Temper brittleness of a material can be fairly detected by the __________ test.
  26. The effect of friction on the flow of steam through a nozzle is to decrease the __________ of steam.
  27. Uniform ramming of sand in green sand moulding process leads to
  28. Which of the following material handling equipments is not suitable for moving materials in varying…
  29. In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean…
  30. With increase in impurities in metals, their corrosion resistances