51. Brass container is suitable for storing
52. Hardening of steel is not possible unless it is heated __________ critical point.
53. Mild steel is a/an __________ steel.
54. __________ is added in low carbon steel to raise its yield point.
55. Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.
56. Telfon (PTFE) is corroded by
57. Vycor, a widely used material for making 'thermal wells' in temperature measurement, is a
58. Electronic structure of a material is generally studied by
59. __________ alloys have the highest specific strength of all the structural materials out of the following.
60. Slow plastic deformation of metals under a constant stress is termed as __________ failure.
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