41. Which of the following comprises of hydrocarbons?
42. Specify the material of construction suitable for handling concentrated HNO3 at 100°C.
43. Which of the following is not an alloy of copper?
44. Softness of silver can be converted into hardness by alloying it with small quantity of
45. Tempering of steel is done to make it
46. Galvanising (i.e., zinc coating) of steel sheets is done to
47. Nickel is a constituent of
48. Which of the following heat treatment processes is used for softening the hardened material?
49. Stainless steel is not corroded by
50. Which of the following stainless steels is non-magnetic?
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