Questions on Crystal Diffraction and Answers

msg767733721 42514


Questions on Crystal Diffraction and Answers


Q1. In the X-ray diffraction pattern of a sodium metal, which has a BCC structure, the missing reflection planes will be

  • (A) 101 
  • (B) 011 
  • (C) 020 
  • (D) 100

Q2. A metal with body centered cubic (bcc) structure shows the first (i.e, smallest angle) diffraction peak at a Bragg angle of θ = 30°. The wavelength of X-ray used is 2.1 Å. The volume of the unit cell of the metal is

  • (A) 9.3 (Å)3 
  • (B) 26.2 (Å)3 
  • (C) 13.1 (Å)3 
  • (D) 4.6 (Å)3

Q3. Consider X-ray diffraction from a crystal with a face centered cubic (fcc) lattice. The lattice plane for which there is no diffraction peak is

  • (A) (2, 1, 2) 
  • (B) (2, 0, 0) 
  • (C) (1, 1, 1) 
  • (D) (3, 1, 1)

Q4. For a NaCl crystal, the cell-edge a = 0.563 nm. The smallest angle at which Bragg reflection can occur corresponds to a set of planes whose indices are

  • (A) (100) 
  • (B) (110) 
  • (C) (111) 
  • (D) (200)

Q5. The distance between the adjacent atomic planes in CaCO3, is 0.3 nm. The smallest Bragg scattering for 0.03 nm X-ray is

  • (A) 2.9° 
  • (B) 1.5° 
  • (C) 0.29° 
  • (D) 5.8°

Q6. An X-ray tube operated at 30 kV emits a continuous X-ray spectrum. The short wavelength limit λ (given that e = 1.6 × 10-19 coulomb, c = 3 ×108 m/sec and h = 6.624 ×10-34 J-sec) is given by

  • (A) 0.1656 nm 
  • (B) 0.0414 nm 
  • (C) 0.0207 nm 
  • (D) 0.2040 nm

Q7. The wavelength associated with an electron accelerated through a potential difference 100 V is

  • (A) 1.2 Å 
  • (B) 12.2 Å 
  • (C) 12 nm 
  • (D) 1.22 pm

Q8. X-rays can be deflected by

  • (A) magnetic field
  • (B) only electric field
  • (C) only simultaneously applying electric and magnetic field 
  • (D) neither by electric nor magnetic field

Q9. The number of ions in the unit cell of NaCl crystal is

  • (A) 1 
  • (B) 4 
  • (C) 8
  • (D) 2

Q10. The angle of diffracted X-rays is 90° from the incident direction of X-rays. The interplanar separation of the planes responsible for the diffraction is given by

  • (A)  λ/√2 
  • (B) λ/2 
  • (C) λ√2 
  • (D) (λ√3)/2

Q11. Characteristic X-rays are the characteristic of which of the following :

  • (A) Cathode materials 
  • (B) Accelerating voltage 
  • (C) Anode materials 
  • (D) Tube current

Q12. X-ray diffraction can be applied to

  • (A) liquids only all liquids,
  • (B) solids and crystalline materials 
  • (C) gaseous or vapour materials only 
  • (D) solid, crystalline materials only

Q13. The amplitude of scattering of X-rays scattered by a single atom is generally denoted as

  • (A) Polarization factor 
  • (B) Form factor 
  • (C) Structure factor 
  • (D) Fractional coordination

Q14. During X-ray emission if the voltage is increased:

  • (A) minimum wavelength decreases 
  • (B) intensity increases 
  • (C) minimum wavelength increases 
  • (D) intensity decreases

Q15. In the X-ray diffraction of a set of crystal planes having d equal to 0.18 nm, first order reflection is found to be at an angle of 22° . The wavelength of X-ray is: (sin 22° = 0.208) :

  • (A) 0.0749 nm 
  • (B) 0.0374 nm 
  • (C) 0.749 nm 
  • (D) 0.374 nm

NOTE:- If you need anything else like e-books, video lectures, syllabus, etc. regarding your Preparation / Examination then do 📌 mention it in the Comment Section below. 

Answer Key (if you find any answer wrong, feel free to Correct us)

01.(D)06.(B)11.(D)
02.(D)07.(C)12.(C)
03.(A)08.(A)13.(A)
04.(C)09.(D)14.(B)
05.(D)10.(C)15.(B)

Leave a Comment

close