List of top Engineering Materials Science Questions

Refer to the schematic shown. Two dog-bone samples, labelled 1 and 2, of a Cu-alloy are tested under tension at room temperature to points “E” and “P”, respectively. Subsequently, they are unloaded completely and metallographically polished. Brinell hardness testing was performed in the gauge section of the samples. Which one of the following can be inferred about the measured Brinell hardness number (BHN)?

During the ageing of a homogenized Al-Cu alloy (1 to 4 wt.% Cu) below the GP zone solvus, hardness of the alloy:

A student aims to deposit a thin metallic film on SiO\(_2\) substrate, with an adhesion layer between the metal film and substrate, in a contiguous planar fashion. Island type of growth must be avoided. The student performs an extensive optimization exercise. Which one of the following steps is in the right direction?

For a diffusional transformation (i.e., growth of \( \beta \) precipitates in an \( \alpha \) matrix), which of the following is/are true with increasing degree of undercooling?

In an ideal rubber, the primary factor responsible for elasticity up to small strains is

Which one of the following statements is true for an intrinsic semiconductor?

A differential scanning calorimetry (DSC) experiment tracks the heat flow into or out of a system as a function of temperature. If the experiments given in the options below are performed at 1 atmospheric pressure, then in which case will the DSC thermogram exhibit a spike, either upward or downward?

Vickers microhardness (HV) of a ductile material A is higher than another ductile material B. Which of the following is/are true?

The enthalpy required to create an oxygen vacancy in CeO$_2$ is 4 eV. The number of oxygen vacancies present per mole of CeO$_2$ at 1000 K is _________. (Round off to the nearest integer) Given: $N_A = 6.02 \times 10^{23}$ mole$^{-1}$ $k_B = 8.62 \times 10^{-5}$ eV/K

An electrochemical reaction is known to occur at +4.50 V against a Li$^+$/Li reference electrode. The potential of the same reaction against a Zn$^{2+}$/Zn reference electrode is _________. (Round off to two decimal places) Given standard electrode potentials: Li$^+$/Li : $E^\circ = -3.04$ V Zn$^{2+}$/Zn : $E^\circ = -0.76$ V

Number of atoms per unit area of the (110) plane of a body centered cubic crystal, with lattice parameter \(a\), is

Match the following materials with their corresponding bonding types.