In an ideal HCP packing, the c/a ratio is
Select an option to see the answer and solution.
Metallurgical Engineering · all questionsPhysics of Metals in Metallurgy
Physics of Metals in Metallurgy
practice.
Practice every MCQ with options. Use Show answers when you want the correct option and solution.
70
Questions
4/4
Page
Pick an option on a question to see the right answer and solution.
Match each material in Group I with a bond type in Group II.
| Group I | Group II |
| P. Silicon | 1. Metallic bonding |
| Q. Copper | 2. Covalant bonding |
| R. Sodium chloride | 3. Ionic bonding |
| 4. Vander-Wallis bonding |
Select an option to see the answer and solution.
Dissociation of a dislocation into two particals in an FCC metal is given by the following equation.
On which plane do these two partial dislocations lie?
On which plane do these two partial dislocations lie?
Select an option to see the answer and solution.
The density and associated crystallinity for two polypropylene samples are as follows:
Density of totally amorphous polypropylene is
| density, g/cm3 | crystallinity, % |
| 1.20 | 50 |
| 1.44 | 80 |
Select an option to see the answer and solution.
The majority charge carriers in p-type silicon are
Select an option to see the answer and solution.
An edge dislocation is present in α-Fe. Atomic diameter of iron atom is 0.25 nm and its shear modulus is 70 GPa. Modulus of the Burgers vector (in nm) is
Select an option to see the answer and solution.
Which one of the following reactions is fcc/bcc crystals with lattice parameter 'a' is energetically favourable?
Select an option to see the answer and solution.
For a simple cubic unit cell with unit vectors, i, j and k, the angle between the lattice vector [100] and [111] in degrees is
Select an option to see the answer and solution.
The electrical conductivity of pure silicon at 300 K is 4.34 × 10-4 (Ωm)-1 and at 500 K, it is 2.15(ΩM)-1. Given that the Boltzman constant, R = 8.6 × 10-5 eV .K-1, the band energy gap is . . . . . . . . eV.
Select an option to see the answer and solution.
A peak in the X-ray diffraction pattern is observed at 2θ = 78°, corresponding to [311] planes of an fcc metal, when the incident beam has a wavelength of 0.154 nm. The lattice parameter of the metal is approximately
Select an option to see the answer and solution.