GATE XE topic:properties-applications-materials PYQs & Answers — Page 4

Questions 31–40 of 79. Imported answers require independent review unless marked reviewed.

Which one of the following samples of high-purity aluminium (Al) single crystal will plastically yield at the lowest applied load under ambient conditions? Loading axis is along the direction shown in the schematic.

Diagram for Engineering Sciences question 55

Your answerChoose one option.

(i)

(ii)

(iii)

(iv)

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Refer to the schematic shown. Two dog-bone samples, labeled 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)?

Diagram for Engineering Sciences question 56

Your answerChoose one option.

BHN of 1 > BHN of 2

BHN of 1 = BHN of 2

BHN of 1 < BHN of 2

A conclusion about BHN of samples 1 and 2 cannot be made, with the provided information

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

Your answerChoose one option.

increases monotonically

decreases monotonically

first increases and then decreases

first decreases and then increases

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The resistivity of a pure semiconductor at 298 K is 300 Ωm. Assume that the number of electrons excited (

) across the band gap is given by the relation

: Avogadro’s number = 6.02×10²³ mole⁻¹

: Boltzmann’s constant = 8.62×10⁻⁵ eV/K

: Absolute temperature

Mobility of electrons in the semiconductor = 0.14 m²/(V s)

Mobility of holes in the semiconductor = 0.06 m²/(V s)

Absolute charge of an electron = 1.60×10⁻¹⁹ C

The band gap (

) of the semiconductor is ________ eV. (Round off to two decimals)

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A new glass material is developed to minimize the transmission of the light through the window with glass panel of thickness 5 mm. The refractive index of the glass material is 1.5 and the absorption coefficient can be changed from 0.3 cm⁻¹ to 1 cm⁻¹. In the given range of absorption coefficients, the ratio of the maximum to the minimum fraction of the light coming out of the other side of the glass panel is ________. (Round off to two decimal places)

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The dielectric constant of a material at ultraviolet frequencies is mainly due to

Your answerChoose one option.

dipolar polarizability

ionic polarizability

electronic polarizability

interfacial polarizability

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A magnet of mass 50 g has a magnetic moment of 4.2 × 10⁻⁷ A m². The density of the magnet is 7.2 g cm⁻³. The intensity of magnetization in A m⁻¹ is ________ (round off to 3 decimal places)

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A co-joined cross-ply laminate composite, as shown in figure, is distorted upon heating. What are the resultant shapes of edges XY and YZ?

Diagram for Engineering Sciences question 12

Your answerChoose one option.

XY —; YZ ∪

XY ∪; YZ —

XY ∪; YZ ∩

XY ∩; YZ ∪

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The drift mobility of electron in an n-type Si crystal doped with 10

phosphorous atoms is 1350 cm

. The electrical conductivity in Ω

is ________ (round off to nearest integer)

(Given: Intrinsic charge concentration of Si = 1.45 × 10

; Charge of an electron, e = 1.6 × 10

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At 1000 K, the linear thermal expansion coefficients of graphite, parallel and perpendicular to the graphite layers, are 0.8 × 10

and 29 × 10

, respectively. The percentage increase in the volume of graphite when heated from 900 K to 1100 K is ________ (round off to 2 decimal places)

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GATE XE topic:properties-applications-materials PYQs

Question 55

Question 56

Question 57

Question 63

Question 64

Question 4

Question 9

Question 12

Question 19

Question 20