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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