Physics of Metals in Metallurgy MCQ Questions and Answers

1

When the wavelength of the incident X-Tay increases the angle of diffraction

A) decreases B) increases C) remains constant D) shows no systematic variation

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Answer & Solution

Answer: Option A

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2

Identify the false statement.

A) Burger vector and the dislocation line are Parallel to each other for screw dislocations B) Burger vector and the dislocation line are perpendicular to each other for edge dislocations C) Screw dislocations glide parallel to its Burger vector D) Edge dislocations glide parallel to its Burger Vector

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Answer: Option D

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3

A schematic of X-ray diffraction pattern of a single phase cubic polycrystal is given below. The miller idices of Peak A is
Physics of Metals in Metallurgy mcq question image

Physics of Metals in Metallurgy mcq question image

A) 210 B) 220 C) 222 D) 310

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Answer & Solution

Answer: Option B

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4

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)

A) 18110 B) 18300 C) 19360 D) 19890

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Answer & Solution

Answer: Option A

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5

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.
Physics of Metals in Metallurgy mcq question image

Parameter	Energy-difference
Parameter	Column 1	Column 2	Column 3	Column 4
Band-gap	ΔE₂	ΔE₁	ΔE₂	ΔE₁
Electron affinity	$$\frac{{\Delta {E_1}}}{2}$$	ΔE₂ - ΔE₁	$$\frac{{\Delta {E_2}}}{2}$$	ΔE₂ - $$\left( {\frac{{\Delta {E_1}}}{2}} \right)$$
Work function	ΔE₁ + ΔE₂	ΔE₂ - $$\left( {\frac{{\Delta {E_1}}}{2}} \right)$$	ΔE₁ - $$\frac{{\Delta {E_2}}}{2}$$	ΔE₂ + $$\left( {\frac{{\Delta {E_1}}}{2}} \right)$$

A) Column 1 B) Column 2 C) Column 3 D) Column 4

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Answer & Solution

Answer: Option B

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6

The co-ordination number in simple cubic structure is

A) 4 B) 6 C) 8 D) 12

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Answer & Solution

Answer: Option B

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7

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

A) 8.94 × 10^-1 B) 8.94 × 10¹ C) 8.94 × 10² D) 8.94 × 10³

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Answer & Solution

Answer: Option C

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8

For an ideal hexagonal-closed packed structure, the c/a ratio and packing efficiency respectively are.

A) 1.633 and 52% B) 1.633 and 74% C) 1.733 and 68% D) 1.733 and 74%

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Answer: Option B

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9

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 $$\frac{a}{2}\left[ {1\overline 1 0} \right]$$

A) $$\frac{a}{6}\left[ {2\overline 1 1} \right]{\text{and}}\frac{a}{6}\left[ {1\overline 2 \overline 1 } \right]$$ B) $$\frac{a}{6}\left[ {1\overline 1 2} \right]{\text{and}}\frac{a}{6}\left[ {1\overline 2 \overline 1 } \right]$$ C) $$\frac{a}{6}\left[ {11\overline 2 } \right]{\text{and}}\frac{a}{6}\left[ {2\overline 1 \overline 1 } \right]$$ D) $$\frac{a}{6}\left[ {211} \right]{\text{and}}\frac{a}{6}\left[ {12\overline 1 } \right]$$

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Answer: Option A

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10

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

A) 6 Fe atoms and 8 Al atoms B) 8 Fe atoms and 8 Al atoms C) 6 Fe atoms and 6 Al atoms D) 4 Fe atoms and 8 Al atoms

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Answer: Option A

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Physics of Metals in Metallurgy MCQ Questions and Answers | Metallurgical Engineering