ECAT Pre General Science Physics Chapter 17 Physics of Solids Online Test With Answers

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ECAT Pre General Science Physics Chapter 17 Physics of Solids Online Test

Sr. # Questions Answers Choice
1 In the doping process, the ratio of the doping atoms to the semi conductor atom is 1 to 10 1 to 10<sup>3</sup> 1 to 10<sup>6</sup> 1 to 10<sup>9</sup>
2 When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as impurification adding doping extrinsivity
3 A semi-conductor in its extremely pure form is known as extrinsic semi-conductor intrinsic semi-conductor either of them none of them
4 The materials in which there are plenty of free electrons for electrical conduction are known as conductors insulators semi-conductors all of them
5 The materials in which valence electrons are bound very tightly to their atoms and are not free, are known as conductors insulators semi-conductors all of them
6 The bands below the valence band are completely filled and play active part in conduction process completely filled and plays no part in conduction process completely filled and play active part in conduction process not completely filled and play no part in conduction process
7 The conduction band in a solid may be empty cannot be empty should be filed all of them
8 The electrons occupying the conduction band are known as conduction electrons free electrons both of them none of them
9 The band above the valence band is called high energy band conduction band empty band none of them
10 The valence band of an atom in a solid is always empty may or may not be empty can never be empty none of them
11 The electrons in the outermost shell of an atom are called core electrons valence electrons high energy electrons none of them
12 When a large number of atoms are brought close to one another to form a solid, each energy level of an isolated atom splits into sub-levels, called energy bands energy shells states all of them
13 Electrons of an isolated atom are bound to the nucleus, and can only have distinct energy level can only have same energy level may or may not have distinct energy levels none of these
14 Which of the following theory completely explain the three types of materials Bohr model of electron distribution Rutherford atomic model Pauli's exclusion principle energy band theory
15 Lead, copper and wrought iron are examples of brittle substances ductile substances plastic substances elastic substances
16 Glass and high carbon steel are the examples of brittle substances ductile substances plastic substances elastic substances
17 The substances which break just after the elastic limit is reached, are known as brittle substances ductile substances plastic substances elastic substances
18 Substances which break just after the elastic limit is reached, are known as brittle substances ductile substances plastic substances elastic substances
19 The maximum stress that a material can withstand, is known as plastic point elastic limit yield point ultimate tensile strength
20 when the deformation produced in the material become permanent, this type of behaviour is called proportionality elasticity plasticity none of them
21 If the stress increased beyond the elastic limit of the material. the deformation produced in the material will be permanent temporary either of them none of them
22 Under the elastic region, the deformation produced in the material, the deformation produced in the material will be permanent temporary either of them none of them
23 The greatest stress that a material can endure without losing the proportionality between stress and strain is called plastic line breaking point proportional limit none of them
24 In the stress-strain graph, stress is increased linearly with strain until a point is reached, this point is known as plastic limit plastic deformation proportional limit elastic behaviour
25 The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structure are 5 7 9 14
26 When the shear stress and shear stain are involved, then their ratio is called Young's modulus Bulk modulus Shear modulus all of them
27 In case of the three dimensional deformation, when volume is involved, the ratio of applied stress to volumetric strain is called Young's modulus Bulk modulus Shear modulus all of them
28 The ratio of shearing stress/shearing strain is called as Modulus Pascal modulus Hooker's modulus Shear modulus
29 The ratio of linear stress/linear strain is called as Yong's modulus Bulk modulus Shear modulus Modulus
30 The units of modulus of elasticity are Nm<sup>-2</sup> Nm ms<sup>-1</sup> Pascal
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