31. Galvanised iron is
32. Age hardening is concerned with
33. Aluminium storage vessel can be used to store
34. A material no longer behaves elastically beyond
35. German silver in an alloy of
36. Which of the following is the lightest of engineering metals?
37. Glass is corroded by
38. Photographic plates are coated with
39. Graphite is a good
40. Graphite is corroded by
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