MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 A polarizer is used to Reduced intensity of light Produce polarized light Increase intensity of light Produce unpolarised light
2 In young's double slit experiment the separation between the slit is halved and distance between the slit and screen is doubled.The fringe width is Unchanged Halved Doubled Quadrupled
3 Plane microwaves are incident on a long slit having a width of 5 cm.The wavelength of the microwaves if the first minima is formed at 30° is 25 cm 5 cm 2.5 cm 5 mm
4 Which of the following properties show light is transverse wave in nature? Interference Reflection Diffraction Polarization
5 To demonstrate the phenomenon of interference we require two sources that emit radiation Of same frequency Different wavelength Of the same frequency and having definite phase relationship Of nearly the same frequency
6 The tip of a needle does not give a sharp image it is due to Polarization Interference Diffraction None of these
7 Which effect provides direct experimental evidence that light is a transverse rather than a longitudinal wave motion? Light can be diffracted Two coherent light waves can be made to interfere. The intensity of light from a point source falls off inversely as the square of the distance from the source Light can be polarized
8 Two monochromatic radiations X and Y are incident normally on a diffraction grating.The second order intensity maximum for X coincides with the third order intensity maximum for Y what is the ratio wavelength of X/wavelength of Y? 1/2 2/3 3/2 2/1
9 Which of the following gives three regions of the electromagnetic spectrum in order of increasing wavelength? Gamma rays,microwaves,visible radiation Ultraviolet infra-red microwaves Radio waves ultraviolet X-rays Visible radiation gamma rays radio waves
10 Which effect provides direct experiment evidence that light is a transverse rather than a longitudinal,wave motion? Light can be diffracted Two coherent light waves can be made to be interfere The intensity of light from a point source falls off inversely as the square of the distance from the source Light can be polarized
11 Ultra-violet rays differ from X-rays in that ultra - violet rays Cannot be diffracted Cannot be polarized Do not affect a photographic plate Have a lower frequency
12 Which of the following frequency ranges includes most of the electromagnetic waves emitted by the ultra - violet tubes used in a sun bed? 5 x 10<sup>5</sup> to 5 x 10<sup>8</sup> Hz 5 x 10<sup>8</sup> to 5 x 10<sup>11</sup> Hz 5 x 10<sup>11</sup> to 5 x 10<sup>14</sup> Hz 5 x 10<sup>14</sup> to 5 x 10<sup>17</sup> Hz
13 In a spectrometer experiment monochromatic light is incident normally on a diffraction grating having 4.5 x 105 lines per meter.The second order line is seen at an angle of 30 to the normal what is the wavelength of the light? 200 nm 430 nm 500 nm 556 nm
14 In young's slit experiment on interference the ratio of the intensities of a bright band and a dark band is 6 : 1 the ratio of the amplitudes o the interfering waves is 16 5/3 4 1/4
15 Signal from a remote control to the device operated by it travels with the speed of: Sound Light Ultrasonics Supersonics
16 When the light is incident on polarizing angle which of the following is completely polarized? Reflected light Refracted light Both reflected and refracted light Neither reflected nor refracted light
17 In the Young's double slit experiment the separation between the slits is halved and the distance between the slits and the screen is doubled the fringe width is Halved Unchanged Doubled Quadrupled
18 For the sustained interference of light the necessary condition is that the two sources should Have constant phase difference Be narrow Be close to each other Of same amplitude
19 If a source of light is moving away from stationary observer then frequency of light wave appears to change because of Doppler's effect Interference Diffraction None of the above
20 When seen in green light the saffron and green portions of our National Flag will appear to be Black Black and green respectively Green Green and yellow respectively
21 Ray optics is valid,when characteristic dimensions are Of the same order as the wavelength of light Much smaller than the wavelength of length Of the order of one millimeter Much larger than the wavelength or light
22 When light travels from one medium to another which are separated by a sharp boundary the characteristic which does not change is Velocity Wavelength Frequency Amplitude
23 Fraunhofer spectrum is a Line absorption spectrum Band absorption spectrum Line emission spectrum Band emission spectrum
24 The sky appears blue because Red light is absorbed Blue light is scattered the most Blue light is absorbed It is its natural color
25 Huygen's wave theory of light cannot explain Diffraction Interference Polarization Photoelectric effect
26 The contrast in the fringes in any interference pattern depends on Frings width Intensity ratio of the sources Distance between the slits Wavelength
27 Which one of the following phenomena is not explained by Huygen's construction of wavefront? Refraction Reflection Diffraction Origin of spectra
28 Light appears to travels in straight lines since It is not absorbed by the atmosphere It is reflected by the atmosphere Its wavelength is very small Its velocity is very large
29 The twinkling of stars is due to The fact that stars do not emit light continususly The refractive index of the earth's atmosphere fluctuate Intermittent absorption of star light by its own atmosphere None of these
30 A prism splits a beam of white light into its seven constituent colors.This is so because Phase of different colors is diferent Amplitude of different colors is different Energy of different colors is different Velocity of different colors if different
31 A sun rise or sun set the sun looks reddish because The sun is coldest at these times Of the effects of reflection and refraction The sun is hottest at these times Of the scattering of light
32 One cannot see through fog because Fog absorbs light The refractive index of fog is infinity Light suffers total reflection at the droplet in a fog Light is scattered by the droplets in fog
33 Stress beyond which a permanent deformation is observed in a body is called Minimum stress Maximum Yield stress Plastic stress
34 Substance which break just after the elastic limit is crossed are called Soft subtances Hard substances Brittle substances Ductile substances
35 If stress is increased beyond the elastic limit a permanent change in the material is observed This behavior is called Elastic deformation Elasticity Plasticity &nbsp;Yield strength
36 Stress that induces a change in the shape of the body is named as Tensile stress Volumetric stress Shear stress None of these
37 Upon applying some unbalanced external stress the deformation may be observed in Length Surface area Volume All of these
38 The atoms or molecules in a crystalline solid are held together by Attractive force Gravitational force Cohesive force Electromagnetic force
39 The limit below which the Hooke s law holds well is called Yield point Breaking stress Tensile strength Elastic limit
40 Steel is more elastic than rubber because It is a metal Its density is higher Ratio of stress to strain is more Ratio of stress to strain is less
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