Bragg’s Law MCQ’s

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This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “Bragg’s Law”.

1. X-ray diffraction patterns are used for studying crystal structure of solids because
a) They have very high energy, hence they can penetrate through solids
b) They are electromagnetic radiation, and hence do not interact with matter (crystals)
c) Their wavelengths are comparable to inter-atomic distances
d) Their high frequency enables rapid analysis

2. For destructive interference to take place, the path difference between the two waves should be:
a) nλ
b) 2nλ
c) (n + 1/2)λ
d) (2n + 1)λ

3. X-rays have larger wavelengths than which of the following?
a) Gamma rays
b) Beta rays
c) Microwave
d) Visible light

4. Bragg’s law is not a sufficient condition for diffraction by crystalline solids.
a) True
b) False

5. Minimum interplanar spacing required for Bragg’s diffraction is:
a) λ/4
b) λ/2
c) λ
d) 2λ

6. In Bragg’s equation [nλ = 2.d.sinθ], θ is the angle between:
a) specimen surface and incident rays
b) normal to specimen surface and incident rays
c) parallel lattice surfaces d distance apart and incident rays
d) normal to parallel lattice surfaces d distance apart and incident rays

7. The Miller indices h, k, and l of parallel planes in a BCC lattice should satisfy which of the following X-ray diffraction reflection rules?
a) h + k + l should be even
b) h, k, and l should all be either even or odd
c) h, k, and l should form Pythagoras triplet
d) all planes allow reflections

8. Laue’s model pictures XRD as reflection from parallel crystalline planes. Reflection is different from refraction as:
a) diffraction occurs throughout the bulk
b) intensity of diffracted beams is less
c) diffraction in crystals occurs only at Bragg’s angles
d) all of the mentioned

9. In the powder method of XRD, the intensities of various bright lines are compared to determine the crystal structure. For simple cubic lattice the ratio of intensities at first two maxima are:
a) 12
b) 34
c) 12
d) None of the mentioned

10. K-alpha x-rays have shorter wavelengths than K-beta x-rays?
a) True
b) False

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