ECAT Physics Online Test With Answers

ECAT Physics Online Test

Sr. # Questions Answers Choice
1 The band above the valence band is called high energy band conduction band empty band none of them
2 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
3 The electrons in the outermost shell of an atom are called core electrons valence electrons high energy electrons none of them
4 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
5 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
6 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
7 Lead, copper and wrought iron are examples of brittle substances ductile substances plastic substances elastic substances
8 Glass and high carbon steel are the examples of brittle substances ductile substances plastic substances elastic substances
9 The substances which break just after the elastic limit is reached, are known as brittle substances ductile substances plastic substances elastic substances
10 Substances which break just after the elastic limit is reached, are known as brittle substances ductile substances plastic substances elastic substances
11 The maximum stress that a material can withstand, is known as plastic point elastic limit yield point ultimate tensile strength
12 when the deformation produced in the material become permanent, this type of behaviour is called proportionality elasticity plasticity none of them
13 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
14 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
15 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
16 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
17 The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structure are 5 7 9 14
18 When the shear stress and shear stain are involved, then their ratio is called Young's modulus Bulk modulus Shear modulus all of them
19 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
20 The ratio of shearing stress/shearing strain is called as Modulus Pascal modulus Hooker's modulus Shear modulus
21 The ratio of linear stress/linear strain is called as Yong's modulus Bulk modulus Shear modulus Modulus
22 The units of modulus of elasticity are Nm<sup>-2</sup> Nm ms<sup>-1</sup> Pascal
23 The modulus of elasticity can be written as stress x strain strain/stress 1/2 x stress x strain stress/strain
24 Experiments revealed that the ratio of the stress to the strain is a constant value for different material all materials a given material all of them
25 The SI unit of strain is N Dynes Pascal Dimensionless
26 The measure of the deformation in a solid when stress is applied to its is called elastic constant young's modulus strain elasticity
27 When a stress changes the shape, it is called the compressional stress tensile stress shear stress any one of them
28 When a stress changes length, it is called the compressional stress tensile stress shear stress any one of them
29 The SI unit of stress is N/m<sup>2</sup> Nmc dynes/m N
30 The force applied on unit area to produce any change in the shape, volume or length of a body is known as strain elasticity stretching stress
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