Question 21 : Miller indices for Octahedral plane in cubic crystal
1. -110
2. -100
3. None
4. -111
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Question 22 : Schottky-defect in ceramic material is
1. Vacancy- interstitial pair of cations
2. Pair of nearby cation and anion vacancies
3. Substitutional impurity
4. Substitutional impurity
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Question 23 : A family of directions is represented by
1. (hkl)
2. [uvw]
3.
4. {hkl}
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Question 24 : Repeatable unit of polymers
1. homopolymer
2. copolymer
3. isomer
4. mer
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Question 25 : Coordination number in simple cubic crystal structure
1. 3
2. 1
3. 4
4. 2
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Question 26 : Pick the thermo-plast from the following
1. Vinyls
2. Epoxies
3. Resins
4. Vulcanized rubber
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Question 27 : The atomic diameter of an BCC crystal (if a is lattice parameter) is
1. a/2
2. a/(4/√3)
3. a
4. a/(4/√2)
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Question 28 : Atomic packing factor is
1. Projected area fraction of atoms on a plane
2. Distance between two adjacent atoms
3. None
4. Volume fraction of atoms in cell
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Question 29 : Electron sea exists in
1. Metallic bond
2. Ionic bond
3. Polar bonds
4. Covalent bond
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Question 30 : Bond strength of secondary bonds is in the range of
1. 100 kJ/mol
2. 1000 kJ/mol
3. 10 kJ/mol
4. 1 kJ/mol
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