MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 Pure form of semiconductor is called Extrinsic semiconductor Intrinsic semiconductor N type P type material
2 A valance band in solids is Always completely filled Empty Either completely or partially filled None
3 The electrons in the outermost shell are called Super electrons Valance electrons Full valance Upper deep up
4 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
5 Such substances which break soon after they cross elastic limit is called Weak substance Ductile substance Brittle substance Organic substance
6 The SI unit of stress is same as that of Momentum Pressure Force Length
7 The ability of body to return to its original shape is called Elasticity Stress Strain Shear
8 Which one of the following is polymer Polythene Polystyrene Nylon All
9 Amorphous solids are called Polymeric Crystal Glassy solids All
10 The idea that all magnetic effects may be due to circulating currents (i.e moving charges) Was first held by Ampere Faraday Lenz Gauss
11 When a germanium atom is doped with phosphorous atoms it becomes N-type semiconductor p-type semiconductor An insulator None of them
12 Acceptor impurities donate Holes Electrons Both Electrons and Holes None of them
13 Donor impurities donate Holes Electrons Both holes and electrons None of them
14 An n-type semiconductor is obtained by doping germanium or silicon with Tetravalent impurity Trivalent impurity Pentavalent impurity Monovalent inpurity
15 The charged nucleus of an atom itself spins its magnetic field is Equal to the field produced by orbital electrons Greater than the field produced by orbital electrons Much weaker than the field produced by orbital electrons Very strong
16 The greatest stress that a material can endure without losing the proportionality between stress and strain is called Plasticity Breaking point Proportional limit Strain
17 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
18 Ratio between total intensity of magnetic field at equator to poles is 1 : 1 2 : 1 1 : 2 1 : 4
19 The conductivity of super conductor at critical temperature becomes Zero 1 Infinite Negative
20 The unit cell of the shape of match box is called Cubic Tetragonal Orthorhombic Rhomboheral
21 Which of the following is not true for a crystalline substance Shorter range order Isotropic electrical conductivity Flat surface Sharp melting point
22 The young s modulus for a perfectly rigid body is Zero 1 Infinite None of these
23 A wire is stretched by applying a stretching force.If the stretching force is doubled within elastic limit Then energy stored in the wire will Be double Increase by four times Increase by eight time Remain same
24 A women of 50 kg distributes her wright equally over high-heeld shoes. Each heel has an area of 0.75 cm2. The pressure exerted by each heel will be 6.66 x 10<sup>6</sup> Pa 3.33&nbsp;x 10<sup>6</sup>&nbsp;Pa 1.67&nbsp;x 10<sup>6</sup>&nbsp;Pa 3.33&nbsp;x 10<sup>-6</sup>&nbsp;Pa
25 The limit up to which the stress is directly proportional to strain is called Elastic limit Proportional limit Breaking limit Ultimate tensile limit
26 If the tensile force is suddenly removed from a wire then its temperature will Decrease Increase Becomes zero Remain constant
27 In compound microscope image formed is Real erect and diminished Virtual inverted magnitude Real inverted and magnified Virtual inverted and magnified
28 Spectrometer can be used to Measure wave length of light Measure refractive index of the materials Study spectra of light All
29 Optical device used in spectrometer Simple microscope Compound microscope Telescope Any of them
30 Basic principle of an optical fibre is Reflection Scattering Polarization Total internal reflection
31 The index of refraction of diamond is 2.0 velocity of light in diamond in m/s is 6 x 10<sup>8</sup> 3 x 10<sup>8</sup> 2 x 10<sup>8</sup> 1.5 x 10<sup>8</sup>
32 The cause of power loss in optic fibre is Absorption Scattering Dispersion All
33 Source of light used in the fibre optic communication Led Laser Photo diode Both a and b
34 An object is placed at a distance of 200 cm from a convex lens of focal length 10 cm the linear magnification is 1/3 2/3 3/4 None
35 In compound microscope magnification of objective is 2 and magnification of eyepiece is 4 magnification of compound microscope is 2 6 8 None
36 A telescope has an objective of focal length 10 cm the magnifying power of telescope is 5.Its length in normal adjustment is 7.5cm 10.5 cm 12 cm 15 cm
37 A convex lens of focal length 5 cm is used as magnifying glass Its magnifying power when the image is formed at infinity 6 5 1.5 7
38 Which does not show polarization Longitudinal wave in gas Transverse wave in gas Both a and b None of these
39 Which of the following is conserved when light waves interfere Intensity Energy Amplitude Momentum
40 Inverse square law for luminace is valid for Search light Isotropic point source Cylindrical source All types of source
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