8/14/2019 Applied Physics Question Paper 38

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1. At equilibrium interatomic spacing, the binding force is

(a) Maximum

(b) Minimum

(c) Zero

(d) Infinity

2. The element which has covalently bonded crystal structure is

(a) aluminum

(b) sodium chloride

(c) germanium

(d) tin

3. Two atoms are separated by an infinite distance. The potential energy between them is

(a) Maximum

(b) Infinite

(c) Minimum

(d) Zero

4. An array of points in space such that the environment about each point is same, is called as

(a) Basis vector(b) Lattice

(c) Space lattice

(d) Super lattice

5. The number of lattice parameters required to define a crystal structure is

(a) 4

(b) 12

(c) 6

(d) 3

6. The total number of Bravais lattices possible in all seven crystal systems, is

(a) 3

(b) 14

(c) 7

(d) 4

7. The crystal structure with the highest packing factor is

(a) BCC

(b) SC

(c) Diamond

(d) HCP

8. The number of atoms per unit cell in the case of simple cubic structure, is

(a) 1

(b) 4

(c) 6

(d) 2

9. If the lattice parameter a = 1.50 nm for a BCC structure, the atomic radius is

(a) 1.06 nm

(b) 0.65 nm

(c) 1.30 nm

(d) 0.53 nm

10. Co-ordination number is maximum for one of the following structures.

(a) Diamond

(b) FCC

(c) SC

(d) BCC

11. The coordination number of diamond is

(a) seven(b) five

(c) six

(d) four

12. The compound which has cubie ZnS structure is

(a) CuCl

(b) KCl

(c) NaCl

(d) MgO

13. The lattice parameters of NaCl crystal system are

(a) a = b = c; = = = 90o

(b) a = b = c; = = = 90o

(c) a = b = c; = = = 90o

(d) a = b = c; = = = 90o

14. CsCl structure is almost identical to

(a) NaCl

(b) KCl

(c) CuCl

(d) LiHg

15. The Miller indices of a plane parallel to Y-axis and having X and Z intercepts at 3 and 2 are

(a) (3 0 2)

(b) ( 3 0 2 )

(c) (2 0 3)

(d) (2 0 3 )

16. Crystal directions are defined as

(a) certain directions inside the crystal

(b) certain directions inside the crystal along which low concentration of atoms exists(c) certain directions inside the crystal along which large concentration of atoms exists

(d) certain direction inside the crystal along which no atoms are present

17. If (h k l) are the Miller indices of a plane in a cubic crystal of lattice constant a. The separation between theparallel planes relating to (h k l) is

(a) a/

(h2 + k2 + 12)

(b) a / h. k. l

(c) a/(h + k + 1)

(d) a/(h2 + k2 + 12)

18. The crystal acts as a three-dimensional grating in(a) Fraunhofar diffraction

(b) Fresnel diffraction

(c) Thomsons experiment

(d) X-ray diffraction

19. If X-rays with =1 A.U. be incident on a family of parallel planes with d=2.5 A.U., the maximum number of orderthat can be observed is

(a) 2

(b) 10

(c) 4(d) 5

20. Debye-Scherren method of X-ray diffraction is a

(a) Powder crystal method

(b) Rotating crystal method

(c) Three-dimensional diffraction method

(d) Laue method