MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 Which of the following is an optical fibre in which the density of central core decreases towards its periphery? multi-mode step index fibre multi-mode graded index fibre both of them none of them
2 In multi-mode step index optical fibre, that layer is called cladding which has higher refractive index lower refractive index both of them none of them
3 The multi-mode step index optical fibre, the central core has high refractive index and low density low refractive index and density low refractive index and low density high refractive index and high density
4 Most widely used optical fibres are those which propagate light by total interval reflection continuous refraction both of them none of them
5 The light signal in an optical fibre is totally confined due to the total internal reflection continuous refraction both of them either of them
6 The light signal in an optical fibre requires that the light should be partially confined within the fibre be totally confined within the fibre not be confined within the table none of them
7 Propagation of light in an optical fibre requires that the light should be partially confined within the fibre be totally confined within the fibre not be confined within the table none of them
8 The diameter of an optical fibre with its protective case may be typically 7.62 cm 67.62 mm 6.0 mm 90 mm
9 The information carrying capacity in an optical fibre is called wavelength frequency bandwidth none of them
10 For a system to transmit thousands of telephones conversations, several television programs and numerous data signals, it need the following number so threads of optical fibre 100 to 200 1000 to 10000 100 to 1000 1 or 2
11 Which of the following cannot be polarized? x-rays light rays sound waves ultraviolet rays
12 When light passes through a tourmaline crystal, it becomes plane polarized directly polarized un-polarized spherically polarized
13 Reflection of light from water, glass, snow and rough road surfaces, for larger angle of incidences, produces images bright images interference glare
14 Which of the following phenomenon cannot take place if we consider light as longitudinal wave? diffraction interference polarization reflection
15 Which property of waves proves that light is a transverse wave? diffraction interference polarization reflection
16 The materials which are used in selective absorption method to polarize the light are chronic substances organic substances inorganic substances diachronic substance
17 Which of the following is the most common method to obtain polarized light? selective absorption reflection from different surfaces refraction through crystals scattering by small particles
18 If the vibrations of the light wave are confined to one plane only, then this light is called unpolarized ligth polarized light sunlight none of them
19 The light which has components in all directions is called unpolarized light polarized light intense light none of them
20 Ordinary light has components of vibrations in one direction only two directions four directions all directions
21 In light waves, the components of electric and magnetic fields are parallel to each other anti-parallel to each right angle to each other none of them
22 A light wave produced by oscillating charge consists of a periodic variation of electric field magnetic field either of them both of them
23 The wavelength of light is 6000°A, the number of waves continued in 0.01 m distance will be 1.6 x 10<sup>4</sup> 3 x 10<sup>3</sup> 2 x 10<sup>6</sup> 4 x 10<sup>8</sup>
24 One angshom is equal to? 10<sup>-8</sup>cm 10<sup>-6</sup>m 10<sup>-10</sup>nm 10<sup>-8</sup>nm
25 Wavelength of X-rays falling at glace angle 30° on crystal with atomic spacing 2 x 10-9m for the first order diffraction is 4 x 10<sup>-6</sup>m 2 x 10<sup>-10</sup>m 0.2 x 10<sup>-10</sup>m 20 x 10<sup>-10</sup>m
26 When a mirror of a Michelsion's interferometor is moved a distance of 0.5 mm, 2000 fringes are observed, the wavelength of the light used is 5000 mm 5000<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°A</span> 500 cm 2000<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°A</span>
27 For the monochromatic beam of X-rays, the crystal planes in a lattice act like a perfect absorbers boundary mirror none of them
28 The study of atomic structures of crystals by X-rays was started in 1890 1905 1914 1944
29 The regular array of atoms in a crystal has spacing of the order of 10<sup>-16</sup>m 10<sup>-14</sup>m 10<sup>-10</sup>m 10<sup>-6 </sup>m
30 We can observe only when the grating spacing is of the order of the wavelength used greater than the wavelength used less than the wavelength used any one of them
31 The wavelength of X-rays is about 10<sup>-14</sup>m 10<sup>-10</sup>m 10<sup>-6</sup>m 10<sup>-4</sup>m
32 A diffraction grating has 500 liens per mm. its slit spacing or grating element will 500 mm 5 x 10<sup>-3 </sup>mm 2 x 10<sup>-5</sup>mm 2 x 10<sup>-3</sup>mm
33 If 5000 lines per cm are ruled on different on a diffraction grating then the slit spacing will be 5 x 10<sup>-3</sup>A<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 2 x 10<sup>-4</sup>A<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 5 x 10<sup>-5</sup>A<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 2 x 10<sup>4</sup>A<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
34 A diffraction grating contains 5000 lines per centimeter, its grating element will be 1 x 10<sup>-4</sup>nm 1 x 10<sup>-14</sup>m 1 x 10<sup>-14</sup>cm 1 x 10<sup>-4</sup>cm
35 The diffraction grating is used to measure wavelength of light focal length of a lens refractive index of prism polarization of light
36 The spacing between the parallel lines are served as slits source of light opaque lines fringes
37 A glass plate on which a large number of very fine equidistant parallel lines are drawn is called convex lens thin film diffraction grating interferometer
38 The distance between the top adjacent slits on diffraction grating is called element grating element aperture slit
39 A typical diffraction grating has lines per centimeter 10 to 100 100 to 1000 1000 to 5000 400 to 5000
40 On a diffraction grating which thing acts as a slit the lines which are ruled on it the spacing between the lines either of them none of them
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