शास्त्रज्ञ स्थिरांक कसे मोजतात?

 

Q.  No.	Multiple Choice Questions
1.	The non-crystalline or amorphous solids are characterized by the completely --- arrangement of atoms or molecules. a)      neat                                b) regular c) random                            d) ordered
2.	The science which deals with the study of geometrical form and physical properties of solids is called ---.   a) crystallography                   b) chromatography          c) geography                           d) micrography
3.	Space lattice + --- gives a crystal structure.   a) basic                                  b) cell   c) symmetry                          d) basis
4.	The Miller indices of a plane, in general, are written as ---.        a) (hkl)                                   b) [hlk]        c) {hkl}                                  d) <hkl>
5.	The conventional unit cell of BCC structure is ---.          a) non-primitive                  b) primitive  c) elementary                      d) simple

Q.  No.	Multiple Choice Questions
15.	The reciprocal lattice to simple cubic lattice is the ---.    a) fcc                                                   b) bcc    c) hcp                                                  d) sc
16.	The idea of reciprocal lattice was developed by the scientist ---.    a) Max Laue                                            b) P.P. Ewald    c) Miller                                                  d) Bragg
17.	Bragg’s law is also expressed as ---   a) 2k.G + G2 = 0                                      b) G + G2 = 0   c) 2k.G + G = 0                                       d) 2K2.G + G = 0
18.	The --- point on the normal represents a set of plane of a given orientation and spacing is called as reciprocal lattice.    a) single                                                   b) double   c) triple                                                     d) quadruple
19.	The ratio of electrical conductivity to the thermal conductivity should be --- for all metals at a constant temperature.  a) variable                                                    b) flexible  c) constant                                                   d) fluctuating
20.	At very low temperatures, the specific heat is proportional to ---   a) T3                                                                b) T4   c) T2                                                                d) T5
21.	The simples analysis of the Drude model assumes that electric field is ---   a) random                                                        b) infinite   c) non uniform                                                d) uniform
22.	The thermal conductivity is due to both --- and free electrons.   a) protons                                                            b) photons   c) neutrons                                                          d) mesons
23.	--- is the average net velocity in the direction of electric field.   a) escape velocity                                             b) drift velocity   c) velocity of electrons                                     d) velocity of holes

Q.  No.	Multiple Choice Questions
24.	Electron in Fermi level will follow ---.   a) B-E energy distribution                     b) M-B energy distribution   c) F-D energy distribution                     d) all of the above
25.	Fermi level represents the energy level with probability of it occupation of ---.   a) 0 %                                                             b) 25 %   c) 50 %                                                           d) 75 %
26.	For metals conduction band and valance band are ---   a) fully occupied                                            b) empty   c) partially occupied                                       d) overlapping
27.	In an insulator, the forbidden energy band gap is of the order of ---.   a) 1.0 eV                                                           b) 2.0 eV   c) 3.0 eV                                                           d) 5.0 eV
28.	If the magnitude of current is decreased, the Hall voltage developed is ---.   a) increased                                                      b) remains constant   c) decreased                                                     d) change in direction
29.	At 0 K, semiconductors are ---.   a) perfect semiconductor                                  b) perfect metal   c) perfect insulator                                           d) perfect non-metal
30.	Hall effect can be used to measure ---.   a) conductivity of semiconductor                      b) mobility of  semiconductor   c) resistivity of semiconductor                          d) all of the above
31.	The shape of E-K diagram of the conduction and valance band is ---.  a) vertical                                                        b) horizontal  c) zigzag                                                         d) parabolic
32.	The symbol K in Fermi energy represents ---. a) Boltzmann constant                                   b) M-B constant c) wave vector                                               d) Planck constant

Q.  No.	Multiple Choice Questions
6.	The hexagonal crystal system has only --- Bravais lattice. a)      1                                                        b)  2 c)   3                                                        d)  4
7.	In case of FCC structure there are --- face centered atoms situated at each face.       a) 1                                                            b) 3       c) 6                                                            d) 8
8.	Side of the simple cubic structure is given by ---       a) a = 2r                                                     b) a = r/2       c) a = 4r/3                                                  d) r3
9.	Repeated entity of a crystal structure is known as ---.      a) Miller indices                                     b) unit cell      c) lattice                                                  d) basis
10.	The diffraction depends on the crystal structure and on ---.       a) frequency                                          b) wavelength       c) intensity                                            d) distance
11.	In X-ray crystallography, the 2d image formed is converted into 3d form using the mathematical concept of ---.       a) Fourier transform                             b) permutation       c) Geiger method                                 d) partial differentiation
12.	The words ‘diffractions’ and ‘reflection’ are mutually interchangeable in --- treatment.       a) Bragg’s                                                b) Newton’s       c) Einstein’s                                            d) Laue’s
13.	A crystal acts as 3D --- for X-ray of wavelength of the order of atomic diameter.      a) prism                                                     b) grating      c) cylindrical obstacle                               d) thin wire
14.	The X-ray diffraction occurs from various sets of --- planes having different orientation and interplaner spacing.     a) circular                                                b) perpendicular     c) parallel                                                d) spherical