Explore topic-wise MCQs in Materials Science.

This section includes 26 Mcqs, each offering curated multiple-choice questions to sharpen your Materials Science knowledge and support exam preparation. Choose a topic below to get started.

1.

K-alpha x-rays have shorter wavelengths than K-beta x-rays?

A. True
B. FalseView answer
Answer» C.
Discussion
2.

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. 1⁄2
B. 3⁄4
C. 1⁄2
D. None of the mentionedView answer
Answer» B. 3⁄4
Discussion
3.

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 raysView answer
Answer» D. normal to parallel lattice surfaces d distance apart and incident raysView answer
Discussion
4.

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 mentionedView answer
Answer» E.
Discussion
5.

Minimum interplanar spacing required for Bragg’s diffraction is:

A. λ/4
B. λ/2
C. λ
D. 2λView answer
Answer» C. λ
Discussion
6.

Bragg’s law is not a sufficient condition for diffraction by crystalline solids.

A. True
B. FalseView answer
Answer» B. FalseView answer
Discussion
7.

What should be the value of X?

A. θ
B. θ/2
C. 2θ
D. θ/3
Answer» D. θ/3
Discussion
8.

If X-ray of wavelength 100 Å is incident on an atom at an angle of 90°, then what should be the value of d for first-order sepctrum?

A. 30 Å
B. 40 Å
C. 50 Å
D. 60 Å
Answer» D. 60 Å
Discussion
9.

If the angle of incidence is 30°, then the wavelength for first-order spectrum is equal to __________

A. d
B. 2d
C. d/2
D. d/3
Answer» B. 2d
Discussion
10.

Bragg’s law was proposed in __________

A. 1903
B. 1913
C. 1893
D. 1853
Answer» C. 1893
Discussion
11.

Bragg’s law is a special case of Laue diffraction.

A. True
B. False
Answer» B. False
Discussion
12.

The scattering of waves in Bragg’s law experiment is due to __________

A. Einstein’s scattering
B. Rayleigh scattering
C. Newton scattering
D. Inelastic scattering
Answer» C. Newton scattering
Discussion
13.

When X-ray are incident on an atom, they make an electronic cloud move.

A. True
B. False
Answer» B. False
Discussion
14.

Bragg’s law is used in which process?

A. X-ray production
B. Gamma-ray production
C. X-ray crystallography
D. X-ray scan
Answer» D. X-ray scan
Discussion
15.

Peaks of scattered intensity is observed when the path difference would be equal to __________

A. λ
B. λ/2
C. 3 λ/2
D. No peaks are observed at any condition
Answer» B. λ/2
Discussion
16.

The correct expression for Bragg’s law is nλ = ___________

A. dsinθ
B. dcosθ
C. 2dsinθ
D. 2dcosθ
Answer» D. 2dcosθ
Discussion
17.

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. <sup>1</sup>‚ÅÑ<sub>2</sub>
B. <sup>3</sup>‚ÅÑ<sub>4</sub>
C. <sup>1</sup>‚ÅÑ<sub>2</sub>
D. None of the mentioned
Answer» B. <sup>3</sup>‚Äö√Ñ√∂‚àö√ñ‚àö√´<sub>4</sub>
Discussion
18.

K-alpha x-rays have shorter wavelengths than K-beta x-rays?$

A. True
B. False
Answer» C.
Discussion
19.

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
Answer» D. normal to parallel lattice surfaces d distance apart and incident rays
Discussion
20.

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
Answer» E.
Discussion
21.

Minimum interplanar spacing required for Bragg’s diffraction is:$

A. λ/4
B. λ/2
C. λ
D. 2λ
Answer» C. ‚âà√≠¬¨‚Ñ¢
Discussion
22.

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
Answer» B. h, k, and l should all be either even or odd
Discussion
23.

Bragg’s law is not a sufficient condition for diffraction by crystalline solids.$

A. True
B. False
Answer» B. False
Discussion
24.

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
Answer» B. 2n‚âà√≠¬¨‚Ñ¢
Discussion
25.

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
Answer» D. Their high frequency enables rapid analysis
Discussion
26.

X-rays have larger wavelengths than which of the following?

A. Gamma rays
B. Beta rays
C. Microwave
D. Visible light
Answer» B. Beta rays
Discussion