2nd Year Physics Chapter 17 Physics of Solids Notes MCQs Solutions

physics 12th notes mcqs chapter 17

1. Which one of the following is a ductile substance


2. What are the substances called which undergo plastic deformation until they break


3. An example of an intrinsic semi conductor is:


4. Which of the following are mechanical properties of a material:


5. Insulators are those materials which have


6. The examples of conductors are:            


7. A new class of ceramic materials was discovered in:


8. If stress increased beyond elastic limit of the material , it becomes permanently changed, this behavior is called


9. A unit cell is the smallest basic structure which is:


10. The ability of a body to return to its original shape is called


11. The value of resistivity of semiconductors is of the order of


12. The prosperity of a material to return to its original shape and size on the removal of strain is called:


13. The transition from solid state to liquid state is actually from:


14. with the rise in temperature, the conductivity of semi-conductor material: 


15. When a battery is connected to a semi-conductor, the current passes through it is due to:


16. Donor impurities are


17. Ordinary glass becomes a very viscous liquid at:        


18. A completely filled band is called


19. The temperature below which the resistivity of a super conductor falls to
zero is called


20. Minority carriers in p-type substances are:


21. On doping, the conductivity of the semi conductor:


22. Partially filled conduction and valence bands with a very narrow forbidden energy gap in between them shows the:


23. A pentaralent impurity in Si:                    


24. The number of crystalline systems is


25. When the stress changes length of a body, it is called:


26. Hook’s law states that the strain is directly proportional to:


27. Each atom in a crystalline vibrates about a fixed point with an amplitude that:


28. The supper conductor was discovered by:       


29. Those materials in which valence and conduction bands are overlap each other are called:


30. When stress changes the shape of the object, it is called


31. The solids are classified as:                     


32. When a body is subjected to some external force, deformation is produced in:


33. When a silicon crystal is doped with a pentavalent impurity, the doped
semiconductor is called


34. The S.I. unit of strain is


35. The material whose resistivity becomes zero below a certain temperature:


36. The ratio of applied stress to volumetric strain is called


37. To form a P-type semi-conductor, silicon is doped with:


38. A stress which changes one dimension only is:


39. A device used to detect very weak magnetic field produced by brain is named as.


40. The force applied on a unit area to produce any change in shape, volume and length is called:


41. In p-type substance the minority charge carriers are


42. Above the Curie temperature, Iron is:


43. The practical use of superconductors is


44. Narrow forbidden energy gap between the conduction and valence band of a conductor is of the order of


45. If a material sets up a magnetic field which opposes the applied magnetic field it is said to be:


46. A conduction band is always:                 


47. Examples of polymeric solids are:


48. The first superconductor was discovered in


49. N-type germanium is obtained by doping intrinsic germanium with


50. The substance among the following which breaks after the elastic limit is called:


51. A semi-conductor in its extremely pure form is called


52. In an n-type material, the minority charge carriers are:


53. When the specimen does not recover its original shape after the stress is removed, its behaviour is called:


54. Amorphous solids are:                 


55. For practical purposes, the proportional limit for ductile material is:


56. The critical temperature for mercury is


57. A hole in a p-type material is


58. Young’s modulus for water is


59. The S.I. unit of stress is same as that of


60. Whole structure of solid obtain by the repetition of unit cells is called:


61. Conduction band may be:            


62. Ceramic materials exhibit super-conductivity at


63. An ordinary glass gradually softness into a paste like state before it becomes a very viscous liquid which is possible at:


64. The strain energy in a deformed wire is actually the gain in the:


65. Magnetism lags behind the magnetizing current this phenomenon is called


66. The substances with resistivity of the order of 10 ⁴ Ohm-meter


67. At 0 k semi conductors are


68. The tensile stress applied is:


69. The force which maintains the long-range order between atoms of crystalline solid is called:


70. Polymer solids are:                       


71. Examples of crystalline solids are:


72. The examples of insulators are:              


73. What type of impurity is to be added to the semi conductor material to provide hole:


74. An example of an extrinsic semi conductor is: 


75. Domains are existed in:


76. The conduction band lies:            


77. A stress which decreases the length along one dimension is known as:


78. The materials whose resistivity becomes zero below a certain temperature are called


79. In p-type substance the majority charge carriers are


80. Artificial polymers are made by a chemical reaction known as:


81. Which one of the following exhibit good strength to weight ratio


82. Valence band may be:                   


83. The ultimate tensile strength (UTS) is the:


84. To get N-type, the Ge is doped with:


85. A substance which has empty conduction band is called


86. When the stress changes the volume of the body, it is called:


87. The electrons occupying by conduction band are:


88. The ratio of applied stress to tensile strain is called:


89. In n-type substance the minority charge carriers are


90. In n-type substance charge carriers are


91. The ratio of the applied stress to shear strain is called:


92. An n-type semiconductor is formed by adding impurity


93. The substances which have partially filled conduction bands are called:


94. Super conductors are used in:


95. A p-type crystal is


96. Yield stress is another name of:              


97. Molecules of a solid possess:                  


98. The field produced by an electron is generated by its


99. The critical temperature of Aluminum is:


100. An P-type substance is:               


101. a p-type semiconductor is obtained by doping germanium or silicon with


102. This phenornenon is called: 


103. Substances in which the atoms do not form magnetic dipole are called:


104. The dimension of strain is:                      


105. Crystalline solid have:                                                     


106. The substances with conductivies between 10⁻¹⁰ and 10⁻²⁰ (Ωm)-1 are called


107. Example of polymeric solid:                    


108. A solid that is intermediate between order and disorder is called:


109. A pentavalent impurity is


110. Atoms, ions and molecules of crystalline materials maintain their long range order due to:


111. The whole structure obtained by the repetition of unit cell is called: 


112. When a silicon crystal is doped with a pentavalent element, it becomes


113. Any change produced in shape, volume or length when a body is subjected some external force is called:


114. Which one is not a ferromagnetic substance?


115. The ratio of stress to strain is called:     


116. To form an N-type semi-conductor, silicon crystal is doped with:


117. The maximum stress which a body can bear is:           


118. With rise in temperature, the conductivity of semi-conductor material


119. The critical temperature of mercury is


120. Semi conductor is one which has:                      


121. The ratio of the applied stress to volume strain is called:


122. The theory failed to explain the complete electric behaviour of solid:


123. Solids with high value of conductivity are called:


124. On introducing a small amount of impurity into a pure semi-conductor, its electrical behaviour:


125. Which one of the following has the greatest energy gap


126. The results of mechanical tests are usually expressed in terms of:


127. Crystalline solids are:                   


128. Amorphous solid are also called:           


129. An example of acceptor impurity is:                   


130. Curie temperature for iron is


131. Acceptor impurities are


132. When a covalent bond is broken in a doped semi conductor:


133. The value of stress beyond which the body is permanently deformed will be known as:


134. Which one of the following is polymeric solid?


135. The resistance of mercury becomes zero at the temperature:


136. The temperature at which the vibrations becomes so great that the structure of the crystal breaks is called:


137. Conductors have:              


138. Which type of impurity is to be added to a pure semi-conductor crystal to provide holes:


139. A solid having regular arrangement of molecules throughout its structure is called


140. Which of the following has the least hysteresis loop area


141. The critical temperature (Te) of lead is


142. Which one pair belongs to accepter impurity?


143. Modulus of elasticity of material is:                    


144. The first super conductor was discovered in:   


145. An N-type substance is:               


146. The maximum stress that a material can withstand is called


147. The band theory of solids has explained the distinguishing behavior of


148. When the stress changes the shape of the body it is called:


149. Once the stress is increased than UTS, the material falls into the region of:


150. Many of the semi-conductors are crystals of the type


151. The materials used for semiconductors are


152. the most suitable metal for making permanent magnet is


153. The area method for finding strain energy is useful for:


154. The core of transformer is laminated or reduces.


155. A p-type material is formed when a semiconductor is doped with:


156. Bulk Modulus is involved when the deformation is:


157. N-Type germanium is obtained by doping intrinsic germanium with


158. Substances which break just after elastic limit is reached, are called


159. The band below the valance band is:


160. Force applied on a unit area is called:                


161. The doped semiconductors are called


162. The smallest three dimensional structure of crystalline solid which repeats over and over again is called


163. Which one is pentavalent impurity?


164. Materials have specific uses depending upon their characteristics and properties such as:


165. The word amorphous means:


166. Valence band:                    


167. The energy band occupying free electrons is called:


168. A vacant or partially filled band is called


169. A solid in which there is no regular arrangement of molecules is


170. Soft magnetic material is


171. An example of donor impurity is:


172. The domain theory Of magnet is important to explain the behaviour of:


173. The dimension of stress is:                      


174. Which one of the following is pentavalent impurity


175. The energy band occupying valance electrons is known as:


176. When a Germanium is doped with pentavalent impurity, the doped semi conductor is:


177. Measure of deformation of body with application of stress is called:


178. Nm⁻² is called


179. The extension produced in a sample of material depends upon:


180. Once the resistance of material drops to zero, the


181. SI unit of stress is same as that of


182. A solid having regular arrangement of molecules throughout its structure is called:


183. Which one of the following is not an acceptor impurity


184. In p-type substance charge carriers are


185. The value of stress beyond which a body is permanently deformed is called


186. The S.I. unit of stress


187. Which one of the following is crystalline solid?


Short Questions

1. Coercivity of steel is more than iron. Why?
2. Define an elastic limit?
3. Define Bulk modulus?
4. Define coercive current?
5. Define crystal lattice ?
6. Define diamagnetic paramagnetic and ferromagnetic substances. Given their examples?
7. Define elasticity?
8. Define modulus of elasticity show that the units of moduclus of elasticity and stress are the same. b) Also discuss its three kinds?
9. Define modulus of elasticity?
10. Define proportional limit?
11. Define stress and strain. What are their SI units?
12. Define ultimate tensile stress?
13. Define unit cell of crystalline solid?
14. Define yield point ?
15. Define Young’s modulus?
16. Describe the formation of energy bands in solids.
17. Differentiate between brittle and ductile substance?
18. Differentiate between n – type and p- types substances?
19. Differentiate between tensile compressive and shear modes of stress and strain?
20. Discus the mechanism of electrical conduction by holes and electrons in a pure semi – conductor element?
21. Distinguish between a valence band and conduction band?
22. Distinguish between crystalline amorphous and polymetic solids?
23. Distinguish between intrinsic and Extrinsic semi- conductors?
24. Distingusish between indrinsic and extrinsic semi-conductors. How will you get n-type and p-type substances?
25. Draw a stress- strain curve for a ductile material and then define the terms elastic limit yield point and ultimate tensile stress?
26. Energy dissipated per cycle for steel is more as compared to iron. Why?
27. Explain the difference amongst electrical behavior of conductors insulator and semi- conductors in terms of energy band theory?
28. How can the conductivity of a semi-conductor be raised?
29. How strain energy can be determined from the force-extension graph ?
30. How the conductivity of a semiconductor dioc can be raised?
31. Name the energy bands which are necessary for electrical conduction through solids ?
32. Show That the dimensions of stress and pressure are the same?
33. Sugar is dissolved in water easily while oil can not do so. What is the reason?
34. What are brittle substances ?
35. What are conductors ?
36. What are conductors insulators and semi – conductors. Describe each of them?
37. What are ductile substances ?
38. What are elastic constants ?
39. What are insulators ?
40. What are polymeric solid ?
41. What are semiconductors ?
42. What are superconductors?
43. What are valence electrons ?
44. What do you mean by Curie temperature ?
45. What do you mean by hysteresis ?
46. What do you understand by crystal lattice?
47. What do you understand by hysteresis loss?
48. What is a crystalline solid ?
49. What is a curie temperature ?
50. What is a semi-conductor diode ?
51. What is a solid ?
52. What is an amorphous solid ?
53. What is an elastic deformation ?
54. What is bulk modulus ?
55. What is bulk modulus for aluminium ?
56. What is bulk modulus for copper?
57. What is bulk strength ?
58. What is cohesive force?
59. What is compressional stress?
60. What is conduction band ?
61. What is critical temperature?
62. What is domain ?
63. What is doping ?
64. What is energy band theory?
65. What is extrinsic semiconductor ?
66. What is hole ?
67. What is hysteresis cycle ?
68. What is hysteresis loss?
69. What is intrinsic semiconductor ?
70. What is meant by deformation in solid ?
71. What is meant by domain?
72. What is meant by hysteresis loss? How is it used in the construction of a transformer?
73. What is meant by strain energy?
74. What is meant by strain energy? How can it be determined from the force extension graph?
75. What is meant by the word amorphous ?
76. What is n-type substance ?
77. What is plasticity or plastic deformation ?
78. What is p-type substance ?
79. What is semi- conductor diode?
80. What is shear modulus ?
81. What is shear modulus for aliminium ?
82. What is shear modulus for copper?
83. What is shear stress?
84. What is strain ?
85. What is stress?
86. What is superconductor ?
87. What is tensile stress?
88. What is the behaviour of semiconductor diode at zero Kelvin ?
89. What is the curie temperature of iron ?
90. What is the difference between elastic deformation and plastic deformation?
91. What is the nature of gap between a conduction and valence band’s of semiconductor ?
92. What is the order or conduction in the semiconductors ?
93. What is the SI unit of modulus of elasticity ?
94. What is the SI unit of stress?
95. What is the source of magnetism of an atom ?
96. What is the stress if the force ‘F’ is applied on unit area ‘A’ ?
97. What is the temperature below which mercury can behave as super conductor ?
98. What is the unit of strain ?
99. What is unit cell?
100. What is valence band ?
101. What is young’s modulus ?
102. What is young’s modulus for aluminium ?
103. What is young’s modulus for copper ?
104. What theory successfully explains the conduction through solid ?
105. When first conductor was discovered?
106. Whether atoms, ions or molecules ?
107. Whether every crystalline solid has a definite melting point ?
108. Whether plastic and polythene polymeric solids ?
109. Whether the SI unit of stress is same as that of pressure ?
110. Whether there is a regular arrangement of molecules in crystalline solids ?
111. Who discovered super conductor first?
112. Why crystals do not conduct?

Long Questions

1. Explain the classification of solids.
2. What are the mechanical properties of solids?
3. Explain elastic limit and yield strength with the help of graph.
4. What is meant by strain energy? Derive the relation for strain energy in deformed material from the area under the force extensions graph?
5. What are the electrical properties of solids?
6. Explain conductors, insulators and semi-conductors on the basis of energy band theory.
7. What is doping? Describe the formation of n-type and p-type semi-conductors.
8. Explain electrical conduction by electrons and holes in semi-conductors.
9. What are the superconductors?
10. Describe magnetic properties of solids. Describe the types of magnets.
11. What is energy band theory?
12. Explain Hysteresis loop.
13. A 25 cm diameter cylinder is subjected to a load of 2500 kg. Calculate the stress on the bar in mega pascals?
14. A 0 m long wire is subjected to stretching force and its length increases by 20 cm, Calculate the tensile strain and the percent elongation which the wire undergoes?
15. A wire 2.5 m long and cross section are 10⁻⁵ m² is stretched 5 mm by a force of 100 N in the elastic region. Calculate. (i) Strain (ii) Young’s Modulus (iii) The energy stored in wire = U =?
16. What stress would cause a wire to increase in length by 0.01 % if the Young’s Modulus of the wire is 12 x 10¹⁰ Pa. What force would produce this stress if the diameter of wire is 0.56 mm?
17. The length of a steel wire is 0 m and its cross sectional area is 0.03 x 10⁻⁴ m². Calculate the work done in stretching the wire where force of 100 N is applied with in the elastic region. Young’s Modulus of steel is 3 x 10¹¹ Nm⁻².
18. A cylindrical copper wire and a cylindrical steel wire each of length 1.5 and diameter 2.0 mm are joined one end to form a composite wire of 3.0 m long. The wire is loaded until its length becomes 3.003 m. Calculate the strain in copper and steel wire and the force applied to the wire. (Young’s Modules of Copper is 2 x 10¹¹ Pa and for steel is 2.0 x 10¹¹ Pa).

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