GATE MT X-ray Diffraction – Bragg’s law, optical metallography, principles of SEM imaging. PYQs & Answers

Questions 1–10 of 10. Imported answers require independent review unless marked reviewed.

Which of the following

reflections is/are allowed in X-ray diffraction pattern of a crystal with face centered cubic lattice?

Your answerSelect all correct options. You can choose more than one.

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Diffraction pattern of a polycrystalline BC metal is obtained using monochromatic X-rays of wavelength 0.25 nm. If the first peak occurs at Brag angle (

) of 30°, then the radius of the metal atom in nm is __________ (round off to 2 decimal places).

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The sequence of peaks corresponding to the planes (in the order of increasing

) observed in the X-ray diffractogram of a pure copper powder sample is __________

Your answerChoose one option.

111, 200, 220, 311

110, 200, 211, 220

110, 200, 211, 311

111, 200, 311, 220

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In the X-ray diffraction pattern of a FCC crystal, the first reflection occurs at a Bragg angle (θ) of 30°. The Bragg angle (in degree) for the second reflection will be: __________ (round off to 1 decimal place).

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X-ray diffraction pattern from an element metal with a FCC crystal structure shows the first peak at a Bragg angle

. The lattice parameter of this metal is ______ nm.

Given, wavelength of the X-ray used is 0.1543 nm.

Your answerChoose one option.

0.185

0.262

0.320

0.370

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A FCC crystal with a lattice parameter of 0.3615 nm is used to measure the wavelength of monochromatic X-rays. The Brag angle (θ) for the reflection from (111) planes is 21.68°. The wavelength of X-rays (in nm, rounded off to three decimal places) is ____________.

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In a typical scanning electron microscope (SEM) image, information about topography and atomic contrast are obtained from _____________.

Your answerChoose one option.

secondary electron and auger electron, respectively.

primary electron and secondary electron, respectively.

secondary electron and back-scatter electron, respectively.

back-scatter electron and auger electron, respectively.

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Consider a dilute substitutional solid solution of X in a metal A. The powder diffraction pattern of this alloy reveals that all the peaks have shifted to the left when compared to those for pure A (with no split of peaks). If such a solute interacts and segregates to an edge dislocation, which of the following positions around the dislocation will it preferentially occupy?

Diagram for Metallurgical Engineering question 37

Your answerChoose one option.

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In a powder diffraction experiment on BCC iron, the first peak occurs at

. The wavelength of X-rays is ______ (in nm to three decimal places). Given: The lattice parameter of iron = 0.287 nm

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The second peak in the powder X-ray diffraction pattern of a FCC metal occurs at a Bragg angle θ (in degrees) = __________ (answer up to two decimal places)

(Given: λ_CuKα = 0.154 nm; lattice parameter of the metal = 0.36 nm)

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GATE MT X-ray Diffraction – Bragg’s law, optical metallography, principles of SEM imaging. PYQs

How to practice X-ray Diffraction – Bragg’s law, optical metallography, principles of SEM imaging.

Question 30

Question 60

Question 15

Question 21

Question 34

Question 24

Question 30

Question 37

Question 52

Question 19