Physics Of Metals In Metallurgy — Part 1 MCQs with Explanations

decreases is the correct answer to “When the wavelength of the incident X-Tay increases the angle of diffraction”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

220 is the correct answer to “A schematic of X-ray diffraction pattern of a single phase cubic polycrystal is given below. The miller idices of Peak A is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

18110 is the correct answer to “The theoretical density of an fcc metal with atomic radius and atomic weight of 0.144 nm and 197 gm.mol -1 respectively, is approximately (in kg.m -3 )”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

Column 2 is the correct answer to “A simplified energy band-diagram of an intrinsic semiconductor at thermal equilibrium (300 K) is shown. In the accompanying table, which one of the four cloumns correctly represents the listed parameters? Assume same effective mass for electrons and holes. Parameter Energy-difference Column 1 Column 2 Column 3 Column 4 Band-gap ΔE 2 ΔE 1 ΔE 2 ΔE 1 Electron affinity $$\frac{{\Delta {E_1}}}{2}$$ ΔE 2 - ΔE 1 $$\frac{{\Delta {E_2}}}{2}$$ ΔE 2 - $$\left( {\frac{{\Delta {E_1}}}{2}} \right)$$ Work function ΔE 1 + ΔE 2 ΔE 2 - $$\left( {\frac{{\Delta {E_1}}}{2}} \right)$$ ΔE 1 - $$\frac{{\Delta {E_2}}}{2}$$ ΔE 2 + $$\left( {\frac{{\Delta {E_1}}}{2}} \right)$$”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

6 is the correct answer to “The co-ordination number in simple cubic structure is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

8.94 × 102 is the correct answer to “Nickel and copper have fcc structures with lattice parameters 0.352 and 0.361 nm respectively. The density of Ni in kg.m -3 is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

1.633 and 74% is the correct answer to “For an ideal hexagonal-closed packed structure, the c/a ratio and packing efficiency respectively are.”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

$$\frac{a}{6}\left[ {2\overline 1 1} \right]{\text{and}}\frac{a}{6}\left[ {1\overline 2 \overline 1 } \right]$$ is the correct answer to “A unit dislocation splits into two partial dislocations. The correct combination of the Burgers vectors of the partial dislocations for a given unit dislocation having Burgers vector $$\frac{a}{2}\left[ {1\overline 1 0} \right]$$”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

6 Fe atoms and 8 Al atoms is the correct answer to “The Fe.Al intermetallic phase is an ordered bee structure with Fe atoms at the corner and Al atoms at the body centered positions. Each Fe atom is surrounded by”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

$$\frac{{{V_C}}}{{{V_A}}} = \frac{{\surd {N_C}}}{{\surd {N_A}}}$$ is the correct answer to “In an ionic crystal if the valancies of cation and anion are V C and V A and the coordination numbers of cation and anions are Nc and N A respectively, then the necessary condition for obtaining a stable crystal structure is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

$${\varepsilon _{AB}}$$ is the correct answer to “In a binary system A-B, ε AA , ε BB and ε AB correspond to A-A, B-B and A-B bond energies respectively. The miscibility gap will occur, if”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

(111) is the correct answer to “Slipplane in copper is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

(211) is the correct answer to “The third peak in the X-ray diffraction pattern of a polycrystalline bcc metal is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

[111] is the correct answer to “Along which crystallographic direction, load must be applied in fcc single crystals so that slip starts Simultaneously only on six slip planes”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

Covalant is the correct answer to “The following type of bonding is strongly directional in solids:”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

3 is the correct answer to “Number of slip systems in an ideal close packed hexagonal structure is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

4 tetrahedral and 8 octahedral sites is the correct answer to “In one Fcc unit cell, there are”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

0.34 is the correct answer to “The atomic packing fraction of diamond cubic structure is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

2 : 1 is the correct answer to “For a fcc unit cell, the ratio of the number of tetrahedral voids to the number of atoms is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

16 × 103 is the correct answer to “The grain size of pure copper after annealing for 10 3 S is 10 μm. If the time exponent is 0.5, the total time of annealing required to obtain a grain size of 40 μm is . . . . . . . . S.”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

proportional to b2 is the correct answer to “For dislocation with Burger vector b, the energy is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

0.79 is the correct answer to “A unit cell of an element has maximum linear density along the [110] direction. The packing density of its (100) plane is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

0.129 is the correct answer to “Saturation magnetization of an FCC metal with lattic parameter 0.2 nm is 600 kA/m. The net magnetic moment per atom is given by (in Bohr magnetron)”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

X-rays is the correct answer to “Which one of the following signals from a specimen is used in a scanning electron microscope to get quantitative elemental analysis”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

100 is the correct answer to “An electron beam is accelarated by a potential and the velocity of electrons in the beam is 1.8754 × 10 8 m. s -1 . The accelarting potential in kilovolts is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

lead is the correct answer to “At room temperature F.C.C. crystal structure is observed in”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

0.74 is the correct answer to “The planer density for (111) plane in a fcc crystal is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

1.719 × 10-8 is the correct answer to “If the carrier charge concentration (n) and mobility (μa) in a metallic conductor are respectively 1.602 × 10 -19 C, 8.50 × 10 -3 m 2 . V -1 S -1 , the resistivity of the material in [Ω m] is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

[110] is the correct answer to “The miller indices of the direction common to the planes (111) and (110) in a cubic system is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

(110), (200), (211), (220) is the correct answer to “The Fe. Al intermetallic phase has a disordered bcc structure at high temperatures. This first four Bragg reflections will be”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

P, S is the correct answer to “An elliptical dislocation loop is gliding on plane ABCD of a single crystal of BCC material as shown in the following figure. It is gliding along the burger vector 'b'. Identify the correct statement. P. Plane ABCD belongs to the family of (110). Q. Burger vector 'b' belong to <110> direction. R. Dislocation has the edge character at point x and the screw character at point z. S. Dislocation has the screw character at point x”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

P-4, Q-3, R-2, S-1 is the correct answer to “Match the planes in Group 1 with the interplaner spacings in Group 2 for a cubic crystal having a lattice parameter of 'α'. Group 1 Group 2 P. (100) 1. $$\frac{\alpha }{{\surd 5}}$$ Q. (110) 2. $$\frac{\alpha }{{\surd 3}}$$ R. (111) 3. $$\frac{\alpha }{{\surd 2}}$$ S. (210) 4. α 5. $$\frac{\alpha }{2}$$ 6. $$\frac{\alpha }{3}$$”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

P-4, Q-3, R-1 is the correct answer to “Match the energy gaps in Group II with the materials in Group I . Group I Group II P. Diamond 1. 0.1 eV Q. Silicon 2. 0.7 eV R. Grey tin 3. 1.1 eV 4. 6.0 eV”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

3 is the correct answer to “In an FCC crystal, the strain energy per unit length of a dislocation with Burgers vector $$\frac{a}{2}$$ <110> is . . . . . . . . times that of a $$\frac{a}{6}$$ <112> dislocation.”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

<1120> is the correct answer to “In a hcp single crystal, slip on the basal plane may occur; if the tensile axis is along”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

motion of dislocations is the correct answer to “The elastic strain in copper is due to”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

0.68 is the correct answer to “The atomic packing factor the diamond cubic structure is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

fcc is the correct answer to “For a cubic metal with lattice parameter of 3.92°A, the first four diffraction peaks from the X-ray powder diffraction pattern taken with Cu-Ka radiation (λ = 1.5405°A) occur at 2θ values of 39.7, 46.2, 67.5 and 81.3 degrees. The crystal structure of the metal is”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

Tetragonal is the correct answer to “In a conventional unit cell of a crystal a = b ≠ c and a = β = γ = 90°. This crystal belongs to which of the followings systems”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.

highest energy level occupied by the electron at absolute zero R is the correct answer to “Fermi level of an atom refers to the”. This question is standard in competitive examination syllabi for Physics Of Metals In Metallurgy.