Ceramic Science and Technology Mid - I, September - 2014

1.Traditional ceramics consists of _________
  • Clay products
  • Cement
  • Glass
  • Clay, cement and glass
Answer: D
2.Most of the traditional ceramics can be adequately defined as _________
  • Silicate industries
  • Ceramic nitrides
  • Ceramic borides
  • Ceramic carbides
Answer: A
3.Understanding of atomic structure lies in the development of __________
  • Quantum theory
  • Wave mechanics
  • Quantum theory and wave mechanics
  • Electro magnetic theory
Answer: C
4.Silicate sheet structure is an example for _________
  • Metallic crystals
  • Molecular crystals
  • Covalent crystals
  • Ionic crystals
Answer: B
5.According to Pauling’s rules_________ places an upper limit on the coordination number of the cation.
  • Anion radii
  • Cation radii
  • Radius ratio
  • Cation radii – Anion radii
Answer: C
6.Electron cloud is seen in ______________
  • Metallic crystals
  • Molecular crystals
  • Covalent crystals
  • Ionic crystals
Answer: A
7.In Al2O3 – SiO2 system ____________ compound shows incongruent melting.
  • Quartz
  • Crystoballite
  • Tridyimite
  • Mullite
Answer: D
8.In Al2O3 – SiO2 system _________ is between mullite and crystoballite at about 1587°C.
  • Eutectic
  • Eutectoid
  • Peritectic
  • Pertectoid
Answer: A
9._________ Is a ternary compound in MgO – Al2O3 – SiO2 phase diagram.
  • Cordierite
  • Crystoballite
  • Mullite
  • Corundum
Answer: A
10.The congruent melting is shown by __________ in MgO – Al2O3 – SiO2 phase diagram.
  • Sapphirine
  • Crystoballite
  • Mullite
  • Corundum
Answer: A
11.Mintmorillonite is an example of _________________
Answer: Ceramics
12.Thermal radiations in atoms assumed to be emitted discontinuously in energy quanta. It is said by __________________
Answer: Planck
13.Elliptical orientation takes integral values from _________________
Answer: -1 to +1
14.No two electrons can have all quantum numbers same in one atom is told by _______________
Answer: Pauli
15.Dualism of observed light phenomena is postulated by _______________
Answer: De – Broglie
16.H2 shows___________________ bond.
Answer: Covalent
17.The solidus temperature between mullite and alumina in Al2O3 – SiO2 phase diagram occurs at _________________°C
Answer: 1828°C
18.The Al2O3 – SiO2 phase diagram is very useful in _______________ industry.
Answer: Refractory industry
19.In SiO2 – Al2O3 phase diagram the eutectic contains ________________ mole% SiO2
Answer: 95 mole% SiO2
20.The lowest eutectic temperature in MgO – Al2O3 – SiO2 phase diagram is ___________°C
Answer: 1345°C