21. Pick out the wrong statement.
22. Softening of hardned steel is done by its
23. The crystal structure of most of the common metals is
24. Presence of nickel in steel improves its
25. Ceramic materials fabrication can not be done by
26. Aluminium as a material of construction suffers from the disadvantage of
27. The largest consumption of zinc for alloys is in the making of
28. Which of the following is a non-magnetic material?
29. Which of the following is not a non-ferrous alloy?
30. Which has the maximum melting point out of the following?
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