MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 A beam of light enters air from water.Which of the following characteristics of light will not change in water Frequency Wavelength Velocity Amplitude
2 Refractive index of material depends upon Nature of material Wave length Temperature All of these
3 Two lenses of power +12 and -2 diopters are placed in contact the power of combination is 10 diopters 8 diopters 6 diopters 12 diopters
4 If the cover of a red book is observed in monochromatic blue light,It will appear White Red Black Blue
5 A tourmaline crystal is being used as an analyzer In one complete rotation of the crystal the number of excitation will be 0 1 2 4
6 A convex lens is dipped in a liquid whose refractive index is equal to the material of the lens. Then its focal length will become Infinite Zero Extremely small Extremely large
7 The ratio of the diameter of two convex lenses is the ratio of their focal lengths Greater than Less than Equal to None
8 The light signal in graded index fibre is totally confined due to Total inernal reflection Continuous refraction Both a and b Dispersion
9 A spectrometer is used to find Wavelength of light Refractive index of the prism Angle of minimum deviation of prism All of these
10 A double convex lens act as a diverging lens when the object is Inside the focus Between f and 2f At the focus At a large distance
11 The resolving power of human eye is 1<span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">°</span>&nbsp; 2<span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">°</span> 3<span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">°</span> 6<span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">°</span>
12 A fly is sitting on the objective of a telescope pointed towards the moons what effect is impacted in a photograph of the moon taken through the telescope The entire field of vision is blocked There is image of the fly on the photograph There is no effect at all There is the reduction in intensity of the image
13 The magnifying power of a simple microscope can be increased if we use eye piece of Higher focal length Smaller focal length Higher diameter Smaller diameter
14 In a simple microscope if the final image is located at infinity then its magnifying power is 25/f 25 f/25 [1 + (25/f)]
15 The object is placed at the principle focus of a simple microscope if the focal length of the lens is 2cm what is the magnifying power of the microscope 13.5 12.5 Infinity None of these
16 An object is placed between two parallel mirrors the number of images formed is 2 4 8 Infinite
17 The bottom of a container filled with liquid appear slightly raised because of Refraction Interference Diffraction Reflection
18 The brilliance of diamond is Entirely due to refractive index Entirely due to total internal reflection Partly due to total internal reflection None of the above
19 What is the time taken by light to travel 4 mm in a material of refractive index 3 4 x 10<sup>-11</sup>&nbsp;s 2&nbsp;x 10<sup>-11</sup>&nbsp;s 16&nbsp;x 10<sup>-11</sup>&nbsp;s 8&nbsp;x 10<sup>-11</sup>&nbsp;s
20 If the power of a lens is 4 diopters then is focal length is 20 cm 25 cm 50 cm 400 cm
21 Television signal are converted into light signals by Decoder Transistor Photodiode Optical fibre
22 In spectrometer the function of collimator is to produce Diverging beam of light Converging beam of light Parallel beam of light None of these
23 The wavelength of refractive wave in a denser medium is Same as that of the incident wave Become smaller than the incident Becomes greater than the incident wave None of these
24 The minimum distance between a source and the screen for which a real image is possible with a convex lens is Its focal length Twice the focal length Four times the focal length Square of the focal length
25 An object is placed at a distance 18 cm from a convex lens. The image is formed at a distance of 9 cm the focal length of the lens is 6 cm 9 cm 10 cm 18 cm
26 Alexander graham bell transmits a voice message via a Beam of light Telescope Compound microscope Mirror
27 In an optical fibre the speed of light is Directly proportional to its refractive Inversely proportional to its refractive inedex Independent of refractive index Directly proportional to square of refractive index
28 To get high resolving power for a telescope one should use Objective of large aperture Objective of large focal length Eye piece of large focal length Eye piece of small focal length
29 The frequency of light ray is 6 x 1014 Hz. The frequency when it propagates in a medium of refractive index 1.5 will be 6 x 10<sup>14</sup> Hz 4&nbsp;x 10<sup>14</sup>&nbsp;Hz 9&nbsp;x 10<sup>14</sup>&nbsp;Hz 1.67&nbsp;x 10<sup>14</sup>&nbsp;Hz
30 Rainbow is formed due to combination of Dispersion and total internal reflection Reflection and refraction Dispersion and focusing Refection and scattering
31 Spectrum of sun consists of Bright lines Dark lines Bright bands Dark bands
32 Focal length of convex lens is maximum for Blue light Yellow light Green light Red light
33 Wavelength of light of frequency 100 Hz is 2&nbsp;x 10<sup>6 </sup>m 3 x 10<sup>6 </sup>m 4&nbsp;x 10<sup>6&nbsp;</sup>m 5&nbsp;x 10<sup>6 </sup>m
34 One cannot see through fog becuase 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
35 In young s interference experiment one slit is covered with a cellophane paper which absorbs half the intensity then No fringes are observed All fringes will be darks bright fringes will be less bright and dark will be less dark Bright fringes will be brighter and dark fringes will be darks
36 In Newton s rings the central spot appears dark due to Phase change Destructive interference Small eye piece of optical device Both a and b
37 Optically active substance are those substance which Produce polarization of polarized light Rotate the plane of polarization of polarized light Produce double refraction Both a and b
38 Which of the following is not an application of polarization To reduce glare of light To check concentration sugar in solution Curtain less windows All of these
39 A diffraction grating of length 2cm has 4000 lines The grating element is 0.5 x 10<sup>-2</sup> cm 5 x 10<sup>4</sup> 5&nbsp;x 10<sup>-4</sup> 0.5&nbsp;x 10<sup>-4</sup>&nbsp;cm
40 In Michelsons interference the movable mirror is moved and a shift of two fringes is observed then the distance moved by the mirror is <span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">λ</span><font color="#000000" face="Georgia" size="4"><span style="line-height: 23.390625px;">/2</span></font> <span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">λ</span> 2<span style="color: rgb(0, 0, 0); font-family: Georgia; font-size: 18px; line-height: 23.390625px;">λ</span> None
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