MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 Sky seems blue due to Diffraction Polarization Dispersion Scattering
2 The wave length of x-rays is of the order of 10<sup>-17</sup> m 10<sup>-4</sup> cm 10<sup>-9</sup> m 10<sup>-10</sup> m
3 Michelson interferometer is based upon Interference Diffraction Polarization Reflection
4 Bending of light around sharp edges is known as Interference Diffraction Reflection Dispersion
5 In thin film colours are due to Reflection Interference Diffraction Refraction
6 For a point source of light the wave front produced are Circular Spherical Cylinrical None
7 If a light of λ = 588 nm falls on half silvered glass plate in Michelson s interferometer if movable mirror is moved through 0.233 mm the number of fringes will be observed to shift 795 792 786 None
8 Which Phenomenon proves that nature of light is transverse Interference Diffraction Scattering None
9 In single slit diffraction the condition for second minimum is Sinθ =&nbsp;λ d Sinθ =2λ d Sinθ =3λ d Cosθ =0
10 We can achieve polarization by Absorption Reflection Scttering All of above
11 A ray of light always points Anti parallel to wave front Perpendicular to wave front Parallel to wave lets None
12 For constructive interference path difference should be Integral multiple of λ/2 Integral multiple of&nbsp;λ Odd integral multiple of&nbsp;λ Odd integral multiple of λ/2
13 According to Young s experiment if frequency of light used is halved then fringe width becomes 2/3 Double Remains constant Fringe
14 Who proposed wave theory of light Huygens Galileo Einstein Newton
15 The phase difference between two points on a wave front will be 0° 4<span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">π</span> 2<span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">π</span> <span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">π</span>/2
16 The area of hysteresis loop is an indication of the Permeability of the material Susceptibility of the material Retentivity of the material Energy dissipated per cycle
17 Steel is preferred for making permanent magnets because it has Large retentivity and large coercively Small retentively and small coercively Large retentively and small soercively Small retentively and large coactivity
18 Magnetic permeability is maximum for Dia-magnetic Ferromagnetic Paramagnetic Non-magnetic
19 A piece of copper and another of germinium are cooled from room temperature to 80K. The resistance of Each of them increases Each of them decreases Copper increases and germanium for Copper decreases and germanium increases
20 With rise in temperature the electric conductivity of intrinsic semiconductor Increases Decreases First increases and then decreases First decreases and then increases
21 If band gap between valence and conduction band material is 5 eV. The material is Insulator Good conductor Semiconductor Such material are not exist
22 The forbidden energy gap in semiconductors Lies just below the valence band Lies just above the conduction band Is the same as the valence band Lies between the valence band and conduction band
23 The forbidden energy band gaps in conductors semiconductors and EG,EG2 and EG3 respectively The relation among them is EG<sub>1</sub> = EG<sub>2</sub> =&nbsp;EG<sub>3</sub> EG<sub>1</sub>&nbsp;&lt; EG<sub>2</sub>&nbsp;&lt;&nbsp;EG<sub>3</sub> EG<sub>1</sub>&nbsp;&gt; EG<sub>2</sub>&nbsp;&gt;&nbsp;EG<sub>3</sub> EG<sub>1</sub>&nbsp;&lt; EG<sub>2</sub>&nbsp;&gt;&nbsp;EG<sub>3</sub>
24 A semiconductor is known to have an electron concentration of 8 x 1013 per cm3 and hole concentration of 5 x 1012 per cm3 the semiconductor is n-type P-type Intrinsic None of these
25 The young s modulus of a wire of length L and radius r is Y if the length is reduced to L/2 and radius to r/2 its young s modulus wire be Y / 2 Y 2 Y 4 Y
26 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
27 The modulus of rigidity of a liquid is Zero 1 Infinite None of these
28 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
29 The fractional change in volume per unit increase in pressure is called Pressure coefficient Volume coefficient Bulk modulus Compressibility
30 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
31 The young s modulus for a perfect rigid body is Zero 1 Infinite None of these
32 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
33 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
34 Crystalline solid do not show Sharp melting points Flat faces Long range order Isotropic expansion coefficients
35 After curie temperature iron is Ferromgnetic Diamagnetic Paramagnetic None
36 The process of doping causes resistivity of semiconductor to Increase Decrease Same Become zero
37 Which one is ferromagnetic Ferries Cobalt Nickel All
38 The curie temperature for iron is 750°C 570°C 750°k 57°K
39 The magnetic fields produced by electron in an atom is due to Spin motion Orbital motion Both a &amp; b All above
40 Identify practical use of superconductor MRI Super computer Magnetic levitation train All above
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