GATE Engineering Sciences
113 questions · 1 years · 12 subjects
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22 questions shown in Materials Science. Filter for cleaner practice sessions.
The band gap of a material is $E_g$ and the energy of an incident photon is $E_p$. Optical absorption will occur in this material if,
Discoloration and loss of mechanical strength of plastic chairs exposed to sunlight for several days is due to
Which one of the following polymer processing techniques involves shaping a heated sheet?
The plot shows three different paths (1, 2, and 3) connecting the initial equilibrium state X to the final equilibrium state Y in a thermodynamic process. Which of the following st...
Which of the following is/are polarization mechanisms in dielectric solids?
Which of these methods is/are used for the synthesis of ceramic powders?
The degrees of freedom of a system with 2 components and 2 phases in equilibrium is ________ (answer in integer).
The interplanar spacing of $(h k l)$ planes is 4.5 nm in a given crystal. For the $(3h 3k 3l)$ planes, the interplanar spacing, in nm, is ________ (rounded off to one decimal place...
The equilibrium vacancy concentration in aluminum at 900 K is 1.1 x 10⁻⁴. The enthalpy of formation of vacancies, in kJ.mol⁻¹, is ________ (rounded off to one decimal place). Given...
Three phases, α, β and L are shown in the binary phase diagram below. Identify the correct G-X (Gibbs free energy vs Composition) plot corresponding to temperature T₀.
In a cubic crystal, the Burgers vector for a mixed dislocation line is $\frac{a}{2}[110]$. The dislocation line lies along the [011] direction. The slip plane of the dislocation is
Match the Thermodynamic laws in Column I with the description given in Column II Column I P Zeroth law Q First law R Second law S Third law Column II 1 Entropy of a perfect crystal...
Match the material property in Column I with the measurement technique in Column II. Column I P Electrical conductivity Q Band gap energy R Young's modulus S Heat of fusion Column...
Which one of the following statements regarding point defects in ionic solids is correct?
Consider 3 crystals (all having FCC lattice) labelled as P, Q and R as described below: Crystal P: Cu crystal with 4 Cu atoms per unit cell Crystal Q: NaCl crystal with 4 Na+ ions...
Which of the following statements is/are applicable to Fick's second law:
According to quantum free electron theory, which of the following statements is/are correct regarding the behavior of valence electrons in a metal?
Fe has a density of 7.87 g.cm⁻³, atomic mass of 55.84 g.mol⁻¹ and net magnetic moment per atom of 2.22 Bohr magnetons (μB). The saturation magnetization of Fe, in A.m⁻¹, is _______...
At the peak (also denoted as UTS) of an engineering stress vs. engineering strain curve for ductile metal, the engineering strain is 0.2. The corresponding true stress (σ) vs. true...
A 1 cm³ Si cube is doped with As with a concentration of 1 atom per 10⁹ Si atoms. The resistance of the doped Si cube, in Ohms, is ________ (rounded off to one decimal place). Give...
A circular disk-shaped ceramic green body has a relative density of 50%. On sintering, both the height and the diameter of the disk shrink by 20%. The sintered disk's relative dens...
The standard electrode potential of Cu²⁺ | Cu is +0.34 V and Zn²⁺ | Zn is -0.76 V. For the Zn | Zn²⁺ || Cu²⁺ | Cu cell, the EMF, in Volts, is ________ (rounded off to two decimal p...