OBJECTIVE PHYSICS
APPLIED PHYSICS
BIT BANK (UNIT-I)
BONDING IN SOLIDS AND CRYSTAL STRUCTURES
1. Among the following bonds, which is stronger bond?
a)Ionic bond b)Metallic bond c)Hydrogen bond d) Vanderwaal’s bond
2. The bond between ice molecules is
a) Covalent bond b)Metallic bond c)Hydrogen bond d)Dispersion bond
3. According to strength and directionality chemical bonds are classified into_________ types.
a)4 b)3 c)2 d)6
4. Which bond is available in all the three states of matter
a) Metallic bond b) covalent bond c) Ionic bond d) Vanderwaal’s bond
5. Metallic bond is_______________
a) An unsaturated covalent bond b) a saturated covalent bond
c) an ionic bond d)weaker secondary bond
6. When bond length is decreased, the bond energy
a) remains constant b)also decreases c)increases d)None of these.
7. The bond formed by oscillatory dipole is
a) covalent bond b)hydrogen bond c)dispersion bond d)ionic bond
8. Primary bonds are formed by
a)Inter molecular forces b)inter atomic forces c)Vanderwaal’s forces D)dipole interaction forces
9. During the formation of a bond
a)some energy is lost b)some energy is gained c)energy remains constant d)total mass decreases
10. Secondary bonds are
a)inter ionic b)inter atomic c)inter molecular d)none of the above
11. 1s2 2s2 2p6 3s1 is the electronic configuration of______
a)Na b)K C)Li d)Br
12. The atomic number of certain element is 83. An atom of this element must contain
a)42 protons & 41 electrons b)83 neutrons c)1 neutron,41electrons&41 protons d)83 electrons
13. If the principal quantum number of an atom is three, it possesses
a)only s,p electrons b) only s electrons c) only p electrons d) only s,p and d electrons
14. Which of the following materials does not have covalent bonds
a)silicon b)organic polymers c)diamond d)copper
15. Sodium atom and sodium ion differ in all aspects except in
a) no. of electrons b) number of protons c)Net electrical charge d)radius
16. The potential energy is negative for a system when it is_____________.
17. Stronger the bond, ___________ the melting point of the solid.
18. The binding force between any two atoms can be written by the equation________________.
19. The binding energy corresponding to any two atoms can be written as_______________.
20. The fixed distance between any two atoms under stable configuration is called as______________
21. Define Space lattice.
22. Define unit cell.
23. What is basis?
24. What are lattice parameters?
25. What is translation vector?
26. What is a primitive cell?
27. What are crystallographic axes?
28. On the bases of relation between lattice parameters, how many crystal systems are there?
29. Name the crystal system for which a=b# c and a=b=g=900 ____________.
30. Name the crystal system for which a # b# c and a # b # g # 900 __________
31. Give an example for a trigonal crystal system___________.
32. SiO2 (Quartz) crystal will have ____________ shape.
33. PbCO3 is an example for ___________ crystal system.
34. The only Crystal system, which will have all the crystal structures is________________.
35. Cubic system exhibits ______________ structures.
36. Total no. Of Bravais lattices ___________.
37. The Crystal systems, which are available only in their primitive form is __________.
38. Monoclinic structure will have _________ structure apart from its primitive structure.
39. Define atomic radius.
40. Define Co-ordination number.
41. Define packing fraction.
42. How many atoms present in simple cubic structure?
43. Give the Co-ordinate number of SC structure?
44. What is the packing fraction of SC structure?
45. What is the relation between atomic radius (r) and lattice constant (a) in case of a SC Structure?
46. How you define a BCC structure?
47. How many atoms present in BCC structure?
48. Nearest neighbor distance in case of a BCC Crystal is ___________.
49. One of the interfacial angles is 1200 in __________ crystal system.
50. The Co-ordination number for BCC structure is _______________.
51. The packing fraction for BCC structure is __________________.
52. Bond energy of NaCl is 4.5 eV. The energy in Joules is________.
53. What is Equilibrium spacing?
54. Define cohesive energy.
55. The type of bonding in Ge is_____________.
56. In stable configuration, the resultant force between two atoms is ____________________.
57. Number of atoms in FCC Structure is ______________.
58. What is the relation between atomic radius (r) and lattice constant (a) in case of FCC?
59. What is the Co-ordination number for FCC structure?
60. What is the packing fraction for FCC structure?
61. The potential energy between two atoms is minimum at ______ distance.
62. The trigonal crystal system is also known with a name __________.
63. Packing fraction is maximum for _________ structure.
64. The length of body diagonal for a cube of edge 3A0 is _______.
65. Ionic bond is also called as a __________.
66. Covalent bond is also called as ___________.
67. The expression for cohesive energy of a crystal is Umin = ____________.
68. The lattice energy per Kg.mole of an Alkali Halide crystal is __________.
69. __________eV energy is required to an electron is taken out from a Sodium(Na) atom.
70. ____________ eV energy released when Chlorine atom accepts an electron.
71. The magnitude of attractive force between the ions governed by _______________ law.
72. The Cohesive Energy is also called as _________________.
73. Vanderwaal’s bonding is a typical example of ______________ type of bonding.
74. In KCl, the atom with greater electron affinity is _________________.
75. The Cohesive energy per molecule of KCl 4.4eV.The cohesive energy when expressed in
KJ/mole is _______________.
76. Dry ionic compounds are _______________ electrically.
77. In metals heat carriers are _________________.
78. ______________ Substances are soluble in water.
79. The symbol P is used for _______________ Bravais lattice.
80. The number of ions in CsCl unit cell ___________.
81. The dimension of NaCl unit cell is 5.6 A0 .The nearest neighbour distance is ___________.
82. Polonium has _____________structure.
83. Lattice +Basis=_____________.
84. How many of the 7 crystal systems will have the relation for interfacial angles as a=b=g=900?
85. The relation between lattice constant (a) and atomic radius(r) in case of a diamond structure
is___________.
86. The force between two atoms can be given as
a) F= (A/rM)+(B/rN) b) F= (A/rM)-(B/rN) c) F= (-A/rM)+(B/rN) d) F= 0
87. The values of M and N in the force expression are
a) M=5, N=5 b) M=2, N=12 c) M=2, N=9 d) M=9, N=2
88. The equilibrium separation between the atoms is given as
a)r0=(B/A) b) r0=(A/B) c) r0=(B/A)N-M d) r0=(B/A)1/N-M
89. An example of primary bond is
a) Hydrogen bond b) dispersion bond c) covalent bond d) weak bond
90. Example of secondary bond is
a) Ionic bond b) dispersion bond c) covalent bond d) metallic bond
91. An example of a Vander Waal’s bond is
a) Neon b) NaCl c) GaAs d) Germanium
92. An example of a hydrogen bond
a) KH2PO4 b) NaCl c) Silicon d) Neon
93. Ionic bond is basically ______ in nature.
a) Weak b) electrostatic c) gravitational d) none
94. Ionic bond is non-directional due to _______
a) Sharing of electrons b) coupling of electrons c) coupling of ions d) spherical charge distribution
95. The net energy required in creating Na+ and Cl-- pair is equal to
a) 1.5 eV b) 3.5eV c) 3.9eV d) 6.5eV
96. The conductivity of NaCl is due to the motion of
a) electron b) holes c) ions d) electron and hole
97. In Cl2 molecule _______ bond exists.
a) Ionic b) covalent c) Hydrogen d) metallic
98. The covalent bond arises due to
a) Sharing of electrons b) transfer of electrons c) coupling of ions d) attraction between atoms
99. The covalent bond is
a) Highly directional b) non-directional c) weak d) none
100. Covalent bonds have _____ property.
a) Brittle b) saturation c) unsaturation d) soft
101. Among the following materials, covalent bond does not exist in
a) Cl2 b) silicon c) Na d) Diamond
102. _______ bonding is a quantum mechanical phenomenon.
a) Ionic b) covalent c) metallic d) hydrogen
103. The first group elements Na, K are more ________ in nature.
a) Ionic b) insulators c) metallic d) semiconductors
104. The metallic crystals have high _________ conductivity.
a) Thermal & electrical b) mechanical c) magnetic d) none
105. According to quantum mechanical concept, the metallic bond is called as
a) saturated covalent bond b) unsaturated covalent bond c)saturated ionic bond d) none
106. Which of the following has covalent bond
a) silicon b) lead c) aluminium d) NaCl
107. When two atoms are separated by infinite distance, its potential energy is
a) maximum b) minimum c) same d) infinity
108. The b potential energy between two atoms can be given as
a) U(r) = (a/rm)+(b/rn) b) U(r) = (a/rm)-(b/rn) c) U(r) = (-a/rm)+(b/rn) d) U(r) = ยต
109. At the equilibrium distance between two atoms, its
a) PE is minimum b) PE is maximum c) KE is zero d) None
110. The PE of the system is minimum when
a) r>r0 b) r=r0 c) r<r0 d) r=0
111. The no. of nearest neighbours for a___________ lattice is __________
a) BCC,8 b)FCC,10 c)FCC,4 d) None
112. According to Bragg’s law
a) 2d=nl sinq b) nl=d sin2q c) nl=2d sinq d) nd=2l sin2q
113. The crystal structure of all the following materials is FCC except _______
a) aluminium b) magnesium c) nickel d)copper
114. The material which has got BCC structure is
a)silver b) tungsten c)zinc d)aluminium
115. The structure of SiO2 (quartz) is
a) hexagonal b) BCC c) FCC d) orthorhombic
116. The direction parallel to [ 242] is_____
a)[142] b) [141] c)[121] d)[124]
117 The crystal structure of Germanium is
a) hexagonal b) BCC c) FCC d) diamond cubic
118 The crystal structure of Nickel is
a) FCC b) SC c) BCC d) None
119. The Miller indices of the diagonal plane of a cube are
a) 110 b) 100 c) 111 d) 123
120. The crystal structure of silver is
a) FCC b) BCC c) HCP d) None of the above
121. Among the crystal structures, which has the highest packing fraction?
a) BCC b) FCC c) Diamond cubic d) None
122. If (321) are the indices of planes in a cubic crystal of edge 6AU. The intercept of the plane of z- axis
a) 2AU b) 1AU c) 6AU d) 3AU
123. The direction normal to the plane (111)
a)( 0,0,0) b)[111 ] c) [000] d) (111)
124. The angle subtended by the two planes (110) and (111)
a) 60 b)90 c) 45 d)0
125. Not a direction in a crystal
a) [111] b) [101] c) [000] d) [211]
126. The Miller indices of planes parallel to z- axis
a) 200 b) 202 c) 222 d) 002
127. The direction that connects the origin and (1/3,1/3,2/3) point is
a)[112] b)[322] c)[211] d)[333]
128. The body diagonal of a cubic cell is given as
a)[112] b)[113] c)[111] d)[110]
129. Bragg’s Law is a condition for _________ of X-rays coming out from parallel planes.
a) interference b) in phase diffraction c) refraction d)None
130. If (326) are the Miller indices of a plane, the intercepts made by the plane on the three axis are
a) 2a,b,c b) a, b, c c) a, 2b,3c d) None
131. A plane parallel to one of the coordinate axis has an intercept of _______
a) infinity b) zero c) one d)None
132. In a cubic cell, a line is projected from origin (one of the cube corners) to a point (½, 1,0) then, the direction is________
a)[210] b)[012] c) [201] d)[120]
133. The direction that connects the origin and the point (1/3,1/3,2/3) in the lattice of crystal
a)[112] b)[332] c)[332] d)[333]
134. For a simple cube d100 : d110 : d111 =______
a) : : (b) : : (c) : : (d) : :
135. A plane making intercepts 1,1,-3 on the x,y,z axes. Then the Miller indices of the plane are
a)(311) b)(31) c)(31) d)(133)
136. In a crystal lattice of primitive vectors a, b,c a set of parallel planes make intercepts 3a,4b on x and y axes and parallel to z axes. Then the planes are represented as
a)(403) b)(430) c)(340) d)(043)
137. (222) and (111) planes are
a) perpendicular to each other b)parallel to each other c)intersect at angle 570 d)None
138. The length of the body diagonal in FCC crystal is a) √3 a b) √(3a) c) (√3 / 2)a d) a/3
139. The inter facial angle between (111) and (11) is
a) cos-1(1/√3) ) b)cos-13 c)cos-1√3 d)cos-1(1/3)
140. The interplanar distance for (100) planes for a cubic system having lattice parameter a is
a) a/3 b) a c)2a d) a/√2
141. There are _______no. of directions in the family of <100>
a) 6 b) 8 c) 5 d) 12
142. There are _______no. of directions in the family of <110>
a) 6 b) 8 c) 5 d) 12
143. There are _______no. of directions in the family of <111>
a) 6 b) 8 c) 5 d) 12
144. The Miller indices of a plane parallel to y-axis and having x and z intercepts as 3 and 2 is_____
a) (3 0 2) b) (0 ) c) (2 0 3) d) ( 0 )
145. For a simple cube d200 : d212 : d300 =______
a) 3:2:2 b) 2:3:3 c) 4:3:3 d) 1:2:2
146. An analysis of X-ray diffraction of a crystal gives a Bragg reflection at an angle 130. If the wavelength of X-rays used is 0.58A0, the value of interplanar distance is
a) 2.65´10-10m b) 5´10-10m c) 1.32´10-10m d) 1.87´10-10m
147. The Laue spots close to the center of Laue photograph correspond to
a) low index lines b)the low Bragg angles c)high Bragg angles d)high dhkl values
148. The Camera used to take powder diffraction pattern as a
a) Cylindrical shape b) Spherical shape c) Flat shape d) Conic shape
149. For recording powder pattern, we should use X-rays that are
a) white radiation b) monochromatic c)of very low wavelength d) of very high wavelength
150. The direction opposite to [102] is________
a) [201] b) [0] c) [0] d) [204]
151. The interplanar spacing between the planes with Miller indices (221) and lattice constant 5.64A0 is_____
a) 18.8A0 b) 9.4A0 c) 1.88A0 d) 2.82A0
152. The Miller indices of the plane having intercepts (-1/2,1,1/3) on three crystallographic axes are ____
a) (1 3) b) (3 2 ) c) (2 ) d) (3 1)
153. The order of diffraction when X-rays of wavelength 1.08A0 diffracted at an angle 300 from crystal planes of spacing 3.24A0 is __ a) 1 b) 2 c) 3 d) 4
154. For tetragonal crystal sin2qhkl=______
a) {l2/(4a2)}(h2 +k2 + l2) b) {l2/(4a2)}(h2 +k2) +(l2/(4a2)} l2
c) {l2/ (h2 +k2 + l2)}a2 d) {l2/(h2 +k2)}a2 +(l2/l2)b2
155. In Laue method ________is variable.
a) Frequency b) wave length c) d hkl d) angle of diffraction
156. The wavelength of X-rays is __
a) 1A0 b) 1 nm c) 10A0 d) None of these
157. In transmission Laue method Tan2q=________, whereq is Bragg’s angle.
a) r 1 / D (b) D/r1 (c) D.r1 (d)
158. The wavelength of X-ray beam is equal to the inter planar spacing of reflecting planes,
the glancing angle for first order reflection is ______.
a) 300 b) 600 c) 900 d) 1200
159. In transmission Laue method, the angle of diffraction q =______
a) ½ tan-1 (r1/D) b) ½ [1800-tan-1 (r1/D)] c) 1/3 tan-1 (r1/D) d) 00
160. In back-reflection Laue method, the angle of diffraction q =_______
a) ½ tan-1 (r1/D) b) ½ [1800-tan-1 (r1/D)] c) 1/3 tan-1 (r1/D) d) 00
161. In Powder diffraction method, the glancing angle q =________.
a) 4S/R b) R/4S c) S/4R d) None
162. The powder method is also called as _____ method.
a) Debye-Scherrer b) Rotating crystal c) Laue d) None
163. X-rays are used for diffraction studies in crystals because___
a) they electromagnetic waves
b) the wavelength of X-rays is of same order as the inter-atomic spacing
c) they can be scattered by ions in the lattice d) above all
BIT BANK (UNIT-I)
BONDING IN SOLIDS AND CRYSTAL STRUCTURES
1. Among the following bonds, which is stronger bond?
a)Ionic bond b)Metallic bond c)Hydrogen bond d) Vanderwaal’s bond
2. The bond between ice molecules is
a) Covalent bond b)Metallic bond c)Hydrogen bond d)Dispersion bond
3. According to strength and directionality chemical bonds are classified into_________ types.
a)4 b)3 c)2 d)6
4. Which bond is available in all the three states of matter
a) Metallic bond b) covalent bond c) Ionic bond d) Vanderwaal’s bond
5. Metallic bond is_______________
a) An unsaturated covalent bond b) a saturated covalent bond
c) an ionic bond d)weaker secondary bond
6. When bond length is decreased, the bond energy
a) remains constant b)also decreases c)increases d)None of these.
7. The bond formed by oscillatory dipole is
a) covalent bond b)hydrogen bond c)dispersion bond d)ionic bond
8. Primary bonds are formed by
a)Inter molecular forces b)inter atomic forces c)Vanderwaal’s forces D)dipole interaction forces
9. During the formation of a bond
a)some energy is lost b)some energy is gained c)energy remains constant d)total mass decreases
10. Secondary bonds are
a)inter ionic b)inter atomic c)inter molecular d)none of the above
11. 1s2 2s2 2p6 3s1 is the electronic configuration of______
a)Na b)K C)Li d)Br
12. The atomic number of certain element is 83. An atom of this element must contain
a)42 protons & 41 electrons b)83 neutrons c)1 neutron,41electrons&41 protons d)83 electrons
13. If the principal quantum number of an atom is three, it possesses
a)only s,p electrons b) only s electrons c) only p electrons d) only s,p and d electrons
14. Which of the following materials does not have covalent bonds
a)silicon b)organic polymers c)diamond d)copper
15. Sodium atom and sodium ion differ in all aspects except in
a) no. of electrons b) number of protons c)Net electrical charge d)radius
16. The potential energy is negative for a system when it is_____________.
17. Stronger the bond, ___________ the melting point of the solid.
18. The binding force between any two atoms can be written by the equation________________.
19. The binding energy corresponding to any two atoms can be written as_______________.
20. The fixed distance between any two atoms under stable configuration is called as______________
21. Define Space lattice.
22. Define unit cell.
23. What is basis?
24. What are lattice parameters?
25. What is translation vector?
26. What is a primitive cell?
27. What are crystallographic axes?
28. On the bases of relation between lattice parameters, how many crystal systems are there?
29. Name the crystal system for which a=b# c and a=b=g=900 ____________.
30. Name the crystal system for which a # b# c and a # b # g # 900 __________
31. Give an example for a trigonal crystal system___________.
32. SiO2 (Quartz) crystal will have ____________ shape.
33. PbCO3 is an example for ___________ crystal system.
34. The only Crystal system, which will have all the crystal structures is________________.
35. Cubic system exhibits ______________ structures.
36. Total no. Of Bravais lattices ___________.
37. The Crystal systems, which are available only in their primitive form is __________.
38. Monoclinic structure will have _________ structure apart from its primitive structure.
39. Define atomic radius.
40. Define Co-ordination number.
41. Define packing fraction.
42. How many atoms present in simple cubic structure?
43. Give the Co-ordinate number of SC structure?
44. What is the packing fraction of SC structure?
45. What is the relation between atomic radius (r) and lattice constant (a) in case of a SC Structure?
46. How you define a BCC structure?
47. How many atoms present in BCC structure?
48. Nearest neighbor distance in case of a BCC Crystal is ___________.
49. One of the interfacial angles is 1200 in __________ crystal system.
50. The Co-ordination number for BCC structure is _______________.
51. The packing fraction for BCC structure is __________________.
52. Bond energy of NaCl is 4.5 eV. The energy in Joules is________.
53. What is Equilibrium spacing?
54. Define cohesive energy.
55. The type of bonding in Ge is_____________.
56. In stable configuration, the resultant force between two atoms is ____________________.
57. Number of atoms in FCC Structure is ______________.
58. What is the relation between atomic radius (r) and lattice constant (a) in case of FCC?
59. What is the Co-ordination number for FCC structure?
60. What is the packing fraction for FCC structure?
61. The potential energy between two atoms is minimum at ______ distance.
62. The trigonal crystal system is also known with a name __________.
63. Packing fraction is maximum for _________ structure.
64. The length of body diagonal for a cube of edge 3A0 is _______.
65. Ionic bond is also called as a __________.
66. Covalent bond is also called as ___________.
67. The expression for cohesive energy of a crystal is Umin = ____________.
68. The lattice energy per Kg.mole of an Alkali Halide crystal is __________.
69. __________eV energy is required to an electron is taken out from a Sodium(Na) atom.
70. ____________ eV energy released when Chlorine atom accepts an electron.
71. The magnitude of attractive force between the ions governed by _______________ law.
72. The Cohesive Energy is also called as _________________.
73. Vanderwaal’s bonding is a typical example of ______________ type of bonding.
74. In KCl, the atom with greater electron affinity is _________________.
75. The Cohesive energy per molecule of KCl 4.4eV.The cohesive energy when expressed in
KJ/mole is _______________.
76. Dry ionic compounds are _______________ electrically.
77. In metals heat carriers are _________________.
78. ______________ Substances are soluble in water.
79. The symbol P is used for _______________ Bravais lattice.
80. The number of ions in CsCl unit cell ___________.
81. The dimension of NaCl unit cell is 5.6 A0 .The nearest neighbour distance is ___________.
82. Polonium has _____________structure.
83. Lattice +Basis=_____________.
84. How many of the 7 crystal systems will have the relation for interfacial angles as a=b=g=900?
85. The relation between lattice constant (a) and atomic radius(r) in case of a diamond structure
is___________.
86. The force between two atoms can be given as
a) F= (A/rM)+(B/rN) b) F= (A/rM)-(B/rN) c) F= (-A/rM)+(B/rN) d) F= 0
87. The values of M and N in the force expression are
a) M=5, N=5 b) M=2, N=12 c) M=2, N=9 d) M=9, N=2
88. The equilibrium separation between the atoms is given as
a)r0=(B/A) b) r0=(A/B) c) r0=(B/A)N-M d) r0=(B/A)1/N-M
89. An example of primary bond is
a) Hydrogen bond b) dispersion bond c) covalent bond d) weak bond
90. Example of secondary bond is
a) Ionic bond b) dispersion bond c) covalent bond d) metallic bond
91. An example of a Vander Waal’s bond is
a) Neon b) NaCl c) GaAs d) Germanium
92. An example of a hydrogen bond
a) KH2PO4 b) NaCl c) Silicon d) Neon
93. Ionic bond is basically ______ in nature.
a) Weak b) electrostatic c) gravitational d) none
94. Ionic bond is non-directional due to _______
a) Sharing of electrons b) coupling of electrons c) coupling of ions d) spherical charge distribution
95. The net energy required in creating Na+ and Cl-- pair is equal to
a) 1.5 eV b) 3.5eV c) 3.9eV d) 6.5eV
96. The conductivity of NaCl is due to the motion of
a) electron b) holes c) ions d) electron and hole
97. In Cl2 molecule _______ bond exists.
a) Ionic b) covalent c) Hydrogen d) metallic
98. The covalent bond arises due to
a) Sharing of electrons b) transfer of electrons c) coupling of ions d) attraction between atoms
99. The covalent bond is
a) Highly directional b) non-directional c) weak d) none
100. Covalent bonds have _____ property.
a) Brittle b) saturation c) unsaturation d) soft
101. Among the following materials, covalent bond does not exist in
a) Cl2 b) silicon c) Na d) Diamond
102. _______ bonding is a quantum mechanical phenomenon.
a) Ionic b) covalent c) metallic d) hydrogen
103. The first group elements Na, K are more ________ in nature.
a) Ionic b) insulators c) metallic d) semiconductors
104. The metallic crystals have high _________ conductivity.
a) Thermal & electrical b) mechanical c) magnetic d) none
105. According to quantum mechanical concept, the metallic bond is called as
a) saturated covalent bond b) unsaturated covalent bond c)saturated ionic bond d) none
106. Which of the following has covalent bond
a) silicon b) lead c) aluminium d) NaCl
107. When two atoms are separated by infinite distance, its potential energy is
a) maximum b) minimum c) same d) infinity
108. The b potential energy between two atoms can be given as
a) U(r) = (a/rm)+(b/rn) b) U(r) = (a/rm)-(b/rn) c) U(r) = (-a/rm)+(b/rn) d) U(r) = ยต
109. At the equilibrium distance between two atoms, its
a) PE is minimum b) PE is maximum c) KE is zero d) None
110. The PE of the system is minimum when
a) r>r0 b) r=r0 c) r<r0 d) r=0
111. The no. of nearest neighbours for a___________ lattice is __________
a) BCC,8 b)FCC,10 c)FCC,4 d) None
112. According to Bragg’s law
a) 2d=nl sinq b) nl=d sin2q c) nl=2d sinq d) nd=2l sin2q
113. The crystal structure of all the following materials is FCC except _______
a) aluminium b) magnesium c) nickel d)copper
114. The material which has got BCC structure is
a)silver b) tungsten c)zinc d)aluminium
115. The structure of SiO2 (quartz) is
a) hexagonal b) BCC c) FCC d) orthorhombic
116. The direction parallel to [ 242] is_____
a)[142] b) [141] c)[121] d)[124]
117 The crystal structure of Germanium is
a) hexagonal b) BCC c) FCC d) diamond cubic
118 The crystal structure of Nickel is
a) FCC b) SC c) BCC d) None
119. The Miller indices of the diagonal plane of a cube are
a) 110 b) 100 c) 111 d) 123
120. The crystal structure of silver is
a) FCC b) BCC c) HCP d) None of the above
121. Among the crystal structures, which has the highest packing fraction?
a) BCC b) FCC c) Diamond cubic d) None
122. If (321) are the indices of planes in a cubic crystal of edge 6AU. The intercept of the plane of z- axis
a) 2AU b) 1AU c) 6AU d) 3AU
123. The direction normal to the plane (111)
a)( 0,0,0) b)[111 ] c) [000] d) (111)
124. The angle subtended by the two planes (110) and (111)
a) 60 b)90 c) 45 d)0
125. Not a direction in a crystal
a) [111] b) [101] c) [000] d) [211]
126. The Miller indices of planes parallel to z- axis
a) 200 b) 202 c) 222 d) 002
127. The direction that connects the origin and (1/3,1/3,2/3) point is
a)[112] b)[322] c)[211] d)[333]
128. The body diagonal of a cubic cell is given as
a)[112] b)[113] c)[111] d)[110]
129. Bragg’s Law is a condition for _________ of X-rays coming out from parallel planes.
a) interference b) in phase diffraction c) refraction d)None
130. If (326) are the Miller indices of a plane, the intercepts made by the plane on the three axis are
a) 2a,b,c b) a, b, c c) a, 2b,3c d) None
131. A plane parallel to one of the coordinate axis has an intercept of _______
a) infinity b) zero c) one d)None
132. In a cubic cell, a line is projected from origin (one of the cube corners) to a point (½, 1,0) then, the direction is________
a)[210] b)[012] c) [201] d)[120]
133. The direction that connects the origin and the point (1/3,1/3,2/3) in the lattice of crystal
a)[112] b)[332] c)[332] d)[333]
134. For a simple cube d100 : d110 : d111 =______
a) : : (b) : : (c) : : (d) : :
135. A plane making intercepts 1,1,-3 on the x,y,z axes. Then the Miller indices of the plane are
a)(311) b)(31) c)(31) d)(133)
136. In a crystal lattice of primitive vectors a, b,c a set of parallel planes make intercepts 3a,4b on x and y axes and parallel to z axes. Then the planes are represented as
a)(403) b)(430) c)(340) d)(043)
137. (222) and (111) planes are
a) perpendicular to each other b)parallel to each other c)intersect at angle 570 d)None
138. The length of the body diagonal in FCC crystal is a) √3 a b) √(3a) c) (√3 / 2)a d) a/3
139. The inter facial angle between (111) and (11) is
a) cos-1(1/√3) ) b)cos-13 c)cos-1√3 d)cos-1(1/3)
140. The interplanar distance for (100) planes for a cubic system having lattice parameter a is
a) a/3 b) a c)2a d) a/√2
141. There are _______no. of directions in the family of <100>
a) 6 b) 8 c) 5 d) 12
142. There are _______no. of directions in the family of <110>
a) 6 b) 8 c) 5 d) 12
143. There are _______no. of directions in the family of <111>
a) 6 b) 8 c) 5 d) 12
144. The Miller indices of a plane parallel to y-axis and having x and z intercepts as 3 and 2 is_____
a) (3 0 2) b) (0 ) c) (2 0 3) d) ( 0 )
145. For a simple cube d200 : d212 : d300 =______
a) 3:2:2 b) 2:3:3 c) 4:3:3 d) 1:2:2
146. An analysis of X-ray diffraction of a crystal gives a Bragg reflection at an angle 130. If the wavelength of X-rays used is 0.58A0, the value of interplanar distance is
a) 2.65´10-10m b) 5´10-10m c) 1.32´10-10m d) 1.87´10-10m
147. The Laue spots close to the center of Laue photograph correspond to
a) low index lines b)the low Bragg angles c)high Bragg angles d)high dhkl values
148. The Camera used to take powder diffraction pattern as a
a) Cylindrical shape b) Spherical shape c) Flat shape d) Conic shape
149. For recording powder pattern, we should use X-rays that are
a) white radiation b) monochromatic c)of very low wavelength d) of very high wavelength
150. The direction opposite to [102] is________
a) [201] b) [0] c) [0] d) [204]
151. The interplanar spacing between the planes with Miller indices (221) and lattice constant 5.64A0 is_____
a) 18.8A0 b) 9.4A0 c) 1.88A0 d) 2.82A0
152. The Miller indices of the plane having intercepts (-1/2,1,1/3) on three crystallographic axes are ____
a) (1 3) b) (3 2 ) c) (2 ) d) (3 1)
153. The order of diffraction when X-rays of wavelength 1.08A0 diffracted at an angle 300 from crystal planes of spacing 3.24A0 is __ a) 1 b) 2 c) 3 d) 4
154. For tetragonal crystal sin2qhkl=______
a) {l2/(4a2)}(h2 +k2 + l2) b) {l2/(4a2)}(h2 +k2) +(l2/(4a2)} l2
c) {l2/ (h2 +k2 + l2)}a2 d) {l2/(h2 +k2)}a2 +(l2/l2)b2
155. In Laue method ________is variable.
a) Frequency b) wave length c) d hkl d) angle of diffraction
156. The wavelength of X-rays is __
a) 1A0 b) 1 nm c) 10A0 d) None of these
157. In transmission Laue method Tan2q=________, whereq is Bragg’s angle.
a) r 1 / D (b) D/r1 (c) D.r1 (d)
158. The wavelength of X-ray beam is equal to the inter planar spacing of reflecting planes,
the glancing angle for first order reflection is ______.
a) 300 b) 600 c) 900 d) 1200
159. In transmission Laue method, the angle of diffraction q =______
a) ½ tan-1 (r1/D) b) ½ [1800-tan-1 (r1/D)] c) 1/3 tan-1 (r1/D) d) 00
160. In back-reflection Laue method, the angle of diffraction q =_______
a) ½ tan-1 (r1/D) b) ½ [1800-tan-1 (r1/D)] c) 1/3 tan-1 (r1/D) d) 00
161. In Powder diffraction method, the glancing angle q =________.
a) 4S/R b) R/4S c) S/4R d) None
162. The powder method is also called as _____ method.
a) Debye-Scherrer b) Rotating crystal c) Laue d) None
163. X-rays are used for diffraction studies in crystals because___
a) they electromagnetic waves
b) the wavelength of X-rays is of same order as the inter-atomic spacing
c) they can be scattered by ions in the lattice d) above all
