MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 The superposition of the two waves of same frequency and amplitude travelling in the same direction gives rise to an effect called: Diffraction Interference Polarization Dispersion
2 The locus of all points in a medium having same phase of vibration is called: Crest Trough Wavelength Wavefront
3 According to Huygen's principle: Light travel in straight line Light is a transvers wave Light has dual nature All point on the primary wavefront are the sources of secondary wavelets
4 The cause of mirage observed in deserts in bright sunlight is due to: Refraction of light Reflection of light Scattering of light Total internal reflection of light
5 The velocity of light in vacuum can be changed by changing: Frequency Amplitude Wavelength None of these
6 The image of the tip of a needle is never sharp because of Polarization of light Interference of light Diffraction of light Reflection of light
7 Which one the following gives three regions of electromagnetic sepctrum in order of increasing wavelength? Gamma rays, micro waves, visible light Radio waves, ultraviolet waves, X-rays Ultraviolet rays, Infrared rays, micro waves Visible light, gamma rays, radio waves
8 Huygen's theory cannot explain: Diffraction Interference Polarization Photoelectric effect
9 The contrast in the fringes in an interference pattern depends upon Fringe width Relative intensities of the two sources Distance between the slits Wavelength
10 If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity: Fringe width will decrease Fringe width will increase Fringe width will remain unchanged Fringe will become less intense
11 Which one of the following phenomenon cannot be explained on the bases of Huygen's theory? Refraction Reflection Diffraction Formation of spectrum
12 Light appears to travel in straight line because It is not absorbed by the atmosphere It is refracted by the atmosphere Its wavelength is very small Its velocity is very large
13 Star twinkle due to The fact that they do not emit light continously The refractive index of earth's atmosphere fluntuates The star's atmosphere absorbs its light intermittently None of these
14 A prism splits a beam of white light into seven component colors. This is so because Phase of different colors is different Amplitude of different colors is different Energy of different colors is different Velocity of different colors is different
15 The main reason for the high speed of bullet train is Magnetic effect Reduced friction Design of train None of these
16 A bullet train move with the velocity of 400 Kmh<sup>-1</sup> 460 Kmh<sup>-1</sup> 500 Kmh<sup>-1</sup> 510 Kmh<sup>-1</sup>
17 A material most suitable to make the permanent magnet are High retentivity Large coercive current Small domain friction a and b
18 The area of the loop is the dissipated energy which do work against friction of domains is called Current loss Voltage loss Hysteresis loss None of these
19 The energy need to magnetize and demagnetize the specimen during the each cycle of magnetizing current is Value of current Value of demagnetizing current Value of magnetic flux density Area of the loop
20 Hysteresis is the loop in which the material is magnetized and its curve never pass through The same line One side of origin Origin None of these
21 A current which demagnetize the material completely is called Applied current Coercive current Maximum current None of these
22 Remanance or Retentivity is the phenomenon in which the material still remains strongly magnetized when curve is Increase to maximum Reduce to minimum Reduce to zero None of these
23 The saturation of the material reached when magnetic flux density changes from Zero to minimum value Zero to maximum value Maximum to zero value Minimum to negative value
24 In the phenomenon of hysteresis, the magnetism and magnetizing current behaves as I lags 1 leads B I &amp; B becomes equal None of these
25 The curie temperature of iron is 600 C<sup>o</sup> 650 C<sup>o</sup> 700 C<sup>o</sup> 750 C<sup>o</sup>
26 A temperature at which the material losses its orderliness is know as Ambient temperature Curie temperature Highest temperature None of these
27 Hard magnetic materials are Iron Steel Alnico None of these
28 A special alloy called Alnico is known as Soft magnetic material Hard magnetic material In between soft and hand magnetic material None of these
29 The combination of solenoid and a specimen of iron inside it make a power full magnet called Horse shoe magnet Bar magnet Electromagnet&nbsp; 10<sup>-10</sup> to 10<sup>18</sup>
30 Each domain contains the atoms of range of 10<sup>-10</sup> to 10<sup>18</sup> 10<sup>10</sup> to 10<sup>16</sup> 10<sup>12</sup> to 10<sup>17</sup> 10<sup>12</sup> to 10<sup>16</sup>
31 The domains are the small regions of the order of Millimeter&nbsp; Micrometer Micron None of these
32 Ferromagnetic materials are those in which atoms cooperate with each other Weakly Strongly Moderately None of these
33 The motion of a charged nucleus also produces a magnetic field which is Weaker than orbital electrons Stronger than orbital electrons&nbsp; Equal than orbital electrons&nbsp; None of these
34 The examples of diamagnetic substances  Water Copper Antimony All of them
35 Diamagnetic substances are those in which Spin and orbital motions are supported Spin and orbital motions are opposed&nbsp; Resultant of spin and orbital motion is zero None of these
36 Paramagnetic substances are those in which Spin and orbital motions are supported Spin and orbital motions are opposed Spin and orbital motions supported a little None of these
37 An atom in which there is a resultant magnetic field behave like a Tiny magnet Magnetic dipole No magnet a and b
38 The magnetism produced by electrons within an atom is due to Spin motion Orbital motion Spin and orbital motion None of these
39 The magnetism produced by electrons within an atom from motion/motions of electron. One motion Two motions Three motions None of these
40 The magnetic field produced due to circulating currents. The idea was first given by  Faraday Ampere Lenz None of these
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