21. An alloy used in making heating elements for electric heating device is
22. Which of the following is an iron ore ?
23. The important metal used with iron to produce stainless steel is
24. Which of the following metals form an amalgam with other metals ?
25. ________ gives hardness to stainless steel.
26. Bauxite is used as raw material by which industry ?
27. Brass contains
28. Brass is a
29. Brass is an alloy of
30. Brass is an alloy of :
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