GATE XE Properties and Applications of Materials PYQs & Answers — Page 6

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Questions 51–60 of 79. Imported answers require independent review unless marked reviewed.

Topic practice 79 questionsPage 6 of 8

The maximum wavelength of radiation to which Germanium (Ge) is opaque will be\n\n(Given: energy gap of Ge = 0.67 eV, Planck’s constant

, velocity of light

and

)

Your answerChoose one option.

0.8 μm

1.8 μm

2.8 μm

4.8 μm

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Tensile true stress—true strain curve for plastic region of an alloy is given by

When true strain is 0.05, the true stress is 350 MPa. For the same alloy, when engineering strain is 0.12 then the engineering stress is _____ MPa. (round off to the nearest integer)

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The zero point energy of an electron in a box of 0.2 nm width is _____ eV. (round off to 1 decimal place)

(Given: Planck’s constant = 6.63 × 10⁻³⁴ J s, electron mass = 9.1 × 10⁻³¹ kg and 1 eV = 1.6 × 10⁻¹⁹ J)

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The de Broglie wavelength of an electron accelerated across a 300 kV potential in an electron microscope is _____ ×10⁻¹² m. Ignore relativistic effects. (round off to 2 decimal places)

(Given: Planck’s constant = 6.63 × 10⁻³⁴ J s, electron rest mass = 9.1 × 10⁻³¹ kg, electron charge = 1.6 × 10⁻¹⁹ C)

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A stress of 17 MPa is applied to a polymer serving as a fastener in a complex assembly. At constant strain the stress drops to 16.6 MPa after 100 hours. The stress on the polymer must remain above 14.5 MPa in order for the assembly to function properly. The expected life of the assembly is _____ hours. (round off to the nearest integer)

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A piezoelectric material has a Young’s modulus of 72 GPa. The stress required to change the polarization from 640 to 645 C m⁻³ is _____ MPa. (round off to the nearest integer)

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An iron bar magnet having coercivity of 7000 A m⁻¹ is to be demagnetized. The bar is introduced fully inside a 0.25 m long solenoid having 150 turns of wire. The electric current required to generate the necessary magnetic field is _____ A. (round off to 1 decimal place)

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The stress ratio for a completely reversed cyclic loading during a fatigue test is

Your answerChoose one option.

−1

−1/2

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If a material is repelled in an external magnetic field then it is

Your answerChoose one option.

Ferromagnetic

Diamagnetic

Paramagnetic

Antiferromagnetic

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An electron makes a transition from the valence band to the conduction band in an indirect band gap semiconductor. Which one of the following is true?

Your answerChoose one option.

Energy of the electron decreases.

A photon is emitted in the process.

A phonon is annihilated in the process.

A photon is created in the process.

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GATE XE Properties and Applications of Materials PYQs

Question 9

Question 16

Question 18

Question 19

Question 20

Question 21

Question 22

Question 1

Question 3

Question 4