MDCAT Physics Chapter 13 Deformation of Solids MCQ's Test With Answers

MDCAT Physics Chapter 13 Deformation of Solids MCQ's Test

Sr. # Questions Answers Choice
1 A wire length L and radius r is fixed at one end and force F applied another end produces an extension x The extension produced in another wire of the same material of length 2L and radius 2r by force 2F is 1 I 21 41
2 The modulus of rigidity of a liquid is Zero 1 Infinite None of these
3 A wire breaks of stretched by more than 3mm. It is cut into equal parts. Then each part can be stretched with out-breaking by 0.75 mm 1.5 mm 3.0 mm 6.0 mm
4 The fractional change in volume per unit increase in pressure is called Pressure coefficient Volume coefficient Bulk modulus Compressibility
5 A mental wire is stretched by suspending weight to if x is the longitudinal strain and y is young s modulus of elasticity then the elastic potential energy per unit volume is 1/2 y x<sup>2</sup> x<sup>2</sup> / 2y y<sup>2</sup> / 2x x<sup>2</sup> / 2y
6 The young s modulus for a perfect rigid body is Zero 1 Infinite None of these
7 Two wires of the same material have diameters in the ration 2 : 1 if they are stretched by the same force their elongations will be in the ratio 8 : 1 1 : 8 2 : 1 1 : 4
8 Solids have sharp melting points account of Long range order of atoms Short range order of atoms Equal strength of inter-atomic bonds An isotropic nature
9 Crystalline solid do not show Sharp melting points Flat faces Long range order Isotropic expansion coefficients
10 After curie temperature iron is Ferromgnetic Diamagnetic Paramagnetic None
11 The process of doping causes resistivity of semiconductor to Increase Decrease Same Become zero
12 Which one is ferromagnetic Ferries Cobalt Nickel All
13 The curie temperature for iron is 750°C 570°C 750°k 57°K
14 The magnetic fields produced by electron in an atom is due to Spin motion Orbital motion Both a &amp; b All above
15 Identify practical use of superconductor MRI Super computer Magnetic levitation train All above
16 Pure form of semiconductor is called Extrinsic semiconductor Intrinsic semiconductor N type P type material
17 A valance band in solids is Always completely filled Empty Either completely or partially filled None
18 The electrons in the outermost shell are called Super electrons Valance electrons Full valance Upper deep up
19 Conductivity of semiconductor is of order of 10<sup>-6</sup> to 10<sup>4</sup>&nbsp;Ω<sup>-1</sup> m<sup>-1</sup> 10<sup>-10</sup> to 10<sup>-20</sup> (Ωm)<sup>-1</sup> 10<sup>7</sup> Ωm<sup>-1</sup> None
20 Such substances which break soon after they cross elastic limit is called Weak substance Ductile substance Brittle substance Organic substance
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