List of top Material Science and Technology Questions

The value of specific heat at constant volume (\(C_V\)) for diatomic molecules is:

The reciprocal lattice for a body centered cubic crystal is:

Inter-planer spacing for a (034) plane in a simple cubic, whose lattice constant is \(4.5 \times 10^{-10}\) m, is:

The magnitude of the reciprocal lattice vector is related to interplaner spacing \(d_{hkl}\):

Which type of liquid crystal has its structure twisted about the helical axis lying perpendicular to the orientation of molecules?

The coordination number and volume of unit cell of hexagonal closed packed structure are respectively:

The number of distinct space groups possible in 3-dimensions is:

The shortest wavelength, present in X-rays produced by an accelerating potential of 50kV, is:

In Laue's technique of X-ray diffraction, a single crystal is held stationary and the beam of white radiation of wavelength \(\lambda\) is inclined at which condition with glancing angle (\(\theta\)):

The vector form of Bragg's law is used in the construction of:

Diamond exhibits which type of structures:

The correct statements about SC lattice are:
A. The number of atoms per unit cell is 1
B. Its packing factor is 0.52
C. Iron is an example of SC lattice
D. Its Coordination Number is 6
Choose the correct answer from the options given below:

The steps involved in determining the Miller indices are:
A. Take the reciprocal of these intercepts.
B. Simplify the fraction.
C. Enclose the obtained numbers into parentheses.
D. Find the intercepts of the plane on the crystallographic axes.
Choose the correct answer from the options given below:

The potential energy of a system of two atoms is given by the expression \( U = -A/r^2 + B/r^{10} \). A stable molecule is formed with the release of 8.0 eV of energy, when the interatomic distance is 2.8 Å. The values of A and B are:

The energies involved in the process of domain growth are:
A. Exchange energy
B. Anisotropic energy
C. Domain Wall energy
D. Magnetostrictive energy
Choose the correct answer from the options given below:

Match the LIST-I with LIST-II

LIST-I (Parameters)	LIST-II (Expressions)
A. Potential energy of a system of two atoms	I. \( \alpha = \sum_{j} \pm \frac{1}{p_{ij}} \)
B. Madelung constant	II. \( U_{ij} = \pm \frac{q^2}{r} \)
C. Coulomb electrostatic energy	III. \( U = -\frac{A}{r^2} + \frac{B}{r^{10}} \)
D. Cohesive energy	IV. \( U_{ij} = \lambda e^{-r_{ij}/\rho} \pm \frac{q^2}{r_{ij}} \)

Choose the correct answer from the options given below:

Vacancies of the crystal may arise due to:

The surface defects are two-dimensional defects, which have:
A. Grain boundaries
B. Tilt boundaries
C. Twin boundaries
D. Stacking boundaries
Choose the correct answer from the options given below:

Copper has FCC structure with a lattice constant 3.61 Å. The radius of the copper atom is:

Which of the following symmetry does not exist:

Which of the following relations are correct for the cubic crystal:
A. a = b \( \neq \) c
B. a = b = c
C. \( \alpha = \beta = \gamma = 90^\circ \)
D. \( \alpha \neq \beta = \gamma = 90^\circ \)
Choose the correct answer from the options given below:

Match the LIST-I with LIST-II

LIST-I (Bonds)	LIST-II (Formations)
A. Ionic Bonds	Actual transfer of electrons from one atom to another atom
B. Metallic Bonds	Partial sharing of valence electrons by the neighboring atoms
C. Van der Waals Bonds	This type of bonding arises from dipolar interaction of crystals/molecules of the crystal.
D. Hydrogen Bonds	This type of interaction between the oppositely charged ends of permanently polarized molecules.

Choose the correct answer from the options given below:

Which statements are correct for edge dislocation?
A. An edge dislocation moves in the direction of the Burger vector.
B. An edge dislocation involves an extra row of atoms above the slip plane.
C. An edge of the atomic plane is formed internal of the crystal.
D. The Burger vector of an edge dislocation is parallel to the dislocation line.
Choose the correct answer from the options given below:

Which of the following statements are correct:
A. In SC structure a = 2r
B. In SC structure a = r/2
C. In BCC structure a = \( 4r/\sqrt{3} \)
D. In FCC structure a = \( 2\sqrt{2} r \)
Where a is a lattice parameter and r is the atomic radius.

The number of atoms per unit cell of SCC are: