Matellurgy and Material Science Mid - I, September - 2014

1.Particles that most effects the material properties are:
  • Neutrons
  • Protons
  • Electrons
  • Valence electrons
Answer: D
2.Gibbs phase rule for general system:
  • P+F=C-1
  • P+F=C+1
  • P+F= C+2
  • P+F=C-2
Answer: D
3.Eutectoid product in Fe-C system is called
  • Pearlite
  • Bainite
  • Ledeburite
  • Spheroidite
Answer: A
4.Which of the following metal has FCC structure
  • Zinc
  • Gold
  • Magnesium
  • Chromium
Answer: B
5.The percentage of carbon in case of hypo –eutectoid steel are:
  • 2
  • 0.8
  • 3
  • 4.3
Answer: B
6.____________are type of alloys.
  • Single -phase alloys
  • Multi-phase alloys
  • a & b
  • none
Answer: C
7.A phase has the _______________characteristics.
  • The same structure of atomic arrangement throughout.
  • Roughly the same composition and properties throughout.
  • A definite interface between the phase and any surrounding or adjoining phases.
  • a, b & C.
Answer: D
8.Grain boundaries in polycrystalline metals belong to:
  • Line defects
  • Volume defects
  • Point defects
  • Surface defects
Answer: D
9.The formation of solid solutions are governed by
  • Lever Rule
  • Phase rule
  • Hume-Ruthery rule
  • Kelvin-Planck’s Rule
Answer: C
10.________is three phase invariant reactions in which one liquid phase solidifies to produce two solid phases.
  • Eutectic
  • Eutectoid
  • a & b
  • None
Answer: A
11.Mean distance between atoms in the range of __________________ mm
Answer: 0.25
12.Phases that exist on left side of an invariant reaction line are called __________________
Answer: Hyper-phase
13.Which type of bond is directional bond ______________?
Answer: Covalent Bond
14.Substitutional atom occupy _______ in the parent Lattice.
Answer: Lattice Point
15.The amount of one material that will completely dissolved in a second material without creating a second phase is known as ___________.
Answer: Solubility
16.Effective atoms per unit cell in BCC Lattice system are_________________.
Answer: 2
17.A phase diagram in which constituents exhibit complete solid solubility is known as _____________ Phase diagram.
Answer: Isomorphous
18.The mixture of Ferrite and cementite are ______________.
Answer: Pearlite
19.Materials with _____ bonding are characterized by bonds that are formed by sharing of valance electrons among two or more atoms.
Answer: Covalent
20.______________ is formed between the transisition metals solvent.
Answer: Interstitial Compound