List of top Material Science and Technology Questions

The energy needed to break the crystal into individual atom is called:

Which is not an example of 2D material?

The speed of sound in air undergoing adiabatic changes is given by, where \(\rho\) is the density of medium and \(E_s\) is adiabatic elasticity:

In a crystal, the value of Madelung constant does not depend upon which of the following:

The drift velocity of the electrons is given by, where \(n\) is number of electrons per unit volume, \(I\) is the current, \(e\) is charge on electron and \(A\) is area:

The ratio of thermal and electrical conductivities is a function of only:

The Piezoelectric effect is generally found in:

The potential energy of a diatomic molecule in terms of the interatomic separation \(R\) is given by \[ U(R)=-\frac{A}{R^2}+\frac{B}{R^{10}} \] where \(A\) and \(B\) are constants. For stable equilibrium at \(R=R_e\), the value of \(R_e\) is:

Calculate the number of particles in \(128\ \text{gm}\) sulphur.

Which is not a state function?

If the number of electrons per unit volume for the sodium crystal is \(2.55\times10^{28}/\text{m}^3\), then the value of Hall coefficient is:

The angle between \((111)\) and \((001)\) directions in a cubic crystal is:

For a reversible process, which one is correct?

Among the following, which is not a technique used to study the morphology of materials?

Determine the Miller indices for the plane intersecting the coordinate axes \(x=2\), \(y=2\), and \(z=3\).

Among the following, which one term does not represent Gibbs free energy?

For an ideal hcp structure, where the atomic spheres touch each other, the ratio of \(\dfrac{c}{a}\) is:

The electrical conductivity of a metal \(\sigma\) is given by:

The packing fraction of face centered cubic (fcc) lattice is:

The direct lattices are given by \(a_1=(\hat{i}+\hat{j}+\hat{k})\), \(a_2=(3\hat{i}-2\hat{k})\), and \(a_3=(4\hat{i}+3\hat{j})\). Find out the reciprocal lattices \(b_1\), \(b_2\), and \(b_3\).

The shortest wavelength present in the X-rays at an accelerating potential of \(50\ \text{kV}\) is:

The expression \(C_v=3R\) represents:

Find the lattice parameter \(a\) for a simple cubic crystal refracting an X-Ray \((\lambda = 1.54\ \text{\AA})\) at an angle \(45^\circ\) from a plane having Miller indices \((1,1,0)\) at order \((n=1)\).

A steel wire of length \(2.5\ \text{m}\) and area of cross-section \(2.5\times10^{-6}\ \text{m}^2\) is suspended from torsion hea
D. A \(5\ \text{kg}\) weight is suspended at its free en
D. Find the change in length of wire \((\Delta L)\). Given \(Y=2\times10^{11}\ \text{N/m}^2\).

Which of the following relation gives the potential energy of a diatomic molecule?