8/14/2019 Applied Physics Question Paper 13

1/1

1. Hydrogen bond is an example for

(a) Dispersion bond

(b) Primary bond

(c) Electrostatic bond

(d) Secondary bond

2. The nature of binding for a crystal with alternate and evenly spaced positive and negative ions, is

(a) metallic

(b) covalent

(c) ionic

(d) dipole

3. The condition for minimum potential energy between two atoms, is

(a) m > n

(b) n = m

(c) n > m

(d) n+m = 0

4. The small geometrical shape and the repetition of which will give a complete crystal is called

(a) lattice point(b) lattice

(c) basis

(d) unit cell

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

(a) 3

(b) 4

(c) 12

(d) 6

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

(a) 3

(b) 7

(c) 14

(d) 4

7. The packing factor in case of a simple cubic crystal (SCC) is

(a) 34%

(b) 52%

(c) 68%

(d) 74%

8. If 0.2 nm is the radius of the atom in a crystal in the simple cubic structure, then the nearest neighbour distance is

(a) 0.4 nm

(b) 0.1 nm

(c) 0.6 nm

(d) 0.8 nm

9. If a is the side of a BCC cell, then the nearest neighbour distance is

(a) a

2

(b) a

3

2(c) a

2

(d) a

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

(a) BCC

(b) SC

(c) Diamond

(d) FCC

11. The coordination number of Germanium is

(a) 4

(b) 12

(c) 8

(d) 6

12. The compound which has cubie ZnS structure is

(a) NaCl

(b) KCl

(c) CuCl

(d) MgO

13. The number of Cl ions surrounding each Na ion in NaCl crystal is

(a) 8

(b) 12

(c) 5

(d) 6

14. The cesium chloride structure is the combination of

(a) two SC structures

(b) two HCP structures

(c) two BCC structures

(d) two FCC structures

15. If (2 2 2) are the Miller indices of a plane the intercepts made by the plane on the three crystallographic axes are

(a) (2a, 3b, c)

(b) (3a, 2b, c)

(c) (a, b, c)

(d) (a, 2b, 3c)

16. Crystal directions are defined as

(a) certain directions inside the crystal along which low concentration of atoms exists

(b) certain direction inside the crystal along which no atoms are present(c) certain directions inside the crystal along which large concentration of atoms exists

(d) certain directions inside the crystal

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 / h. k. l

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

(c) a/

(h2 + k2 + 12)

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

18. In X-ray diffraction the crystal is acting as a

(a) prism

(b) two dimensional grating

(c) glass plate

(d) three dimensional grating

19. X-rays of wavelength 1.54 A.U. are diffracted by a crystal with the first maximum occurring at 12 o. What is theseparation between the lattice planes?

(a) 3.303 A.U

(b) 3.703 A.U

(c) 3.603 A.U(d) 3.203 A.U.

20. The Laue spots close to the center of Laue photograph correspond to

(a) low index planes

(b) low Bragg angles

(c) high index planes

(d) high Bragg angles