Answer: Option C. -> Neutral
Refractory refers to the heat resistant material used in almost all processes involving high temperatures and/or corrosive environment.
These are typically used to insulate and protect industrial furnaces and vessels due to their excellent resistance to heat, chemical attack and mechanical damage.

Answer: Option D. -> Toughness
Toughness is Property of a material that enables it to absorb and distribute within itself relatively large amounts of energy (both stresses and strains) of repeated impacts and/or shocks, and undergo considerable deformation before fracturing or failing

Answer: Option C. -> Ferrite
Ferrites that are used in transformer or electromagnetic cores contain nickel, zinc, and/or manganese compounds.
They have a low coercivity and are called soft ferrites.

Answer: Option D. -> X-ray techniques
Crystal structure of a material is, generally, examined by X-ray techniques

Answer: Option A. -> Ionic bond
Ionic bonding is the complete transfer of valence electron(s) between atoms.
It is a type of chemical bond that generates two oppositely charged ions.
In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion

Answer: Option B. -> Copper and tin
Bronze is an alloy consisting primarily of copper, commonly with about 12 - 12.5% tin and often with the addition of other metals (such as aluminium, manganese, nickel or zinc) and sometimes non-metals or metalloids such as arsenic, phosphorus or silicon.

Answer: Option B. -> 0.15%
0.05% Mild (low carbon) steel: approximately 0.05% to 0.25% carbon content with up to 0.4% manganese content (e.g. AISI 1018 steel). Less strong but cheap and easy to shape; surface hardness can be increased through carburizing

Answer: Option C. -> Make the steel ductile and of good bending qualities
The effect of manganese in improving the mechanical properties of steel depends on its carbon content. Manganese also reduces the critical cooling rate during hardening, meaning it increases the hardenability of steel. Its effect on hardenability is higher than other alloying elements. Hadfield steel is recognized for its ability to be work-hardened due to the addition of 10% to 14% of manganese.

Answer: Option B. -> Nonlinear
The most common example of this kind of material is rubber, whose stress-strain relationship can be defined as non-linearly elastic, isotropic, in compressible and generally independent of strain rate. Hyper elasticity provides a means of modeling the stress–strain behavior of such materials

Answer: Option B. -> Magnesium
The strength, hardness, and modulus of elasticity of magnesium-base materials decrease with increasing temperature. Also, the elongation increases with rising temperature up to just below the melting point where it drops to nearly zero