41. The purpose of heat treatment is to
42. The tensile strength of wrought iron is maximum
43. Sulphur in steel
44. Connecting rod is, usually, made from
45. Ball bearings are, usually, made from
46. A small percentage of boron is added to steel in order to
47. Steel contains
48. An eutectoid steel consists of
49. Brass is an alloy of
50. The transistor is made of
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