11. Gun metal contains
12. Which is the false statement about wrought iron? It has
13. Foundry crucible is made of
14. Perminvar alloy having constant permeability is an alloy of
15. Tungsten in steel
16. Closed packed hexagonal space lattice is found in
17. Body centered cubic space lattice is found in
18. A material is said to be allotropic, if it has
19. The surface hardness of the following order is achieved by nitriding operation
20. Slow plastic deformation of metals under a constant stress is known as
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