MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 The diffraction grating is used to determine Intensity of light Wavelength of light Refractive index of prism None of these
2 The distance between the two adjacent slits is called Thickness of the slit Distance between and two slits Grating element None of these
3 In diffraction grating has feature/features like A glass plate A large numbers of lines are ruled Spacing between two lines acts as a slit All of these
4 A typical diffraction grating has lines per centimeter is about 500 to 6000 400 to 5000 450 to 5500 425 to 5670
5 The diffraction of light occurs, due to interference, of Obstructed portion Unobstructed portion Both obstructed and unobstructed light None of these
6 The property of bending of light around the obstacle is known is Interference Polarization Diffraction None of these
7 The relation for the diffraction pattern, when it is minimum d/2 sin θ = λ sin θ = λ/2 d sin θ = λ None of these
8 The phenomenon of diffraction also contains the phenomenon of Polarization Interference Dispersion None of these
9 Diffraction of light occurs, due to the interference between rays coming from the same wavefront of The same parts The different parts Mixed rays None of these
10 The phenomenon is found to be prominent when size of the opening (aperture) is Grater than wavelength of light Smaller than wavelength of light Equal of light used None of these
11 If the light travels in a straight line, the central region should appear Bright Dark No effect None of these
12 In Young's double slit experiment for the interference of light, the central region of the fringe system is Bright Dark Bright and dark None of these
13 When a movable mirror moves λ/4 distance and the light used is 400 nm, then the distance measured highly precise is 100 nm 10<sup>-4</sup> nm 10<sup>-6</sup> nm 10<sup>-5</sup> mm
14 When the movable mirror moves, the distance λ/4 the total path difference would be 2λ λ 2λ/4 None of these
15 The distance between the two mirrors can be varied by Moving glass plate Movable mirror Compensator plate None of these
16 With the help of interferometer, we can find the Wavelength Frequency Phase None of these
17 The function of compensator plate in interferometer is to Interfere properly To equalize the distance of M<sub>1</sub> and M<sub>2</sub> Reflecting light properly None of these
18 The principle of Michelson's interferometers is Refraction Dispersion Interference Reflection
19 According to the relation for constructive destructive interference, the point of contact has zero thickness of air so it should have No interference Conductive interference&nbsp; Destructive interference None of these
20 Due to Plano convex lens and the plane glass plate the thickness of air film changes from the center to outward Increasing gradually Decreasing gradually It is constant at the centre None of these
21 Newton's rings are formed due to Refraction of light Diffraction of light Interference of light None of these
22 In Newton's rings the point of contact of the lens and the glass plate, the air film is Minimum Maximum Zero None of these
23 Measurement of a standard metre in terms of the wavelength of red cadmium light is 1,563,163.5 1,553,363.5 155,553.5 1,553,163.5
24 The relation between displacement of the mirror 'L' and wavelength λ of the light used L = 2mλ L =&nbsp;λ/2m L = mλ/2 None of these
25 Albert A. Michelson devised interferometer is 1820 1845 1860 1881
26 Michelson's interferometer is an instrument used to measure the distance with Precision High precision Extremely high precision None of these
27 The central point in the Newton's rings is dark due to Destructive interference Constructive interference Additional of path difference&nbsp;λ/2 b and c
28 The setting of Newton's rings is A Plano convex lens and the plane glass plate A Plano convex lens and simple glass sheet A Plano convex lens (long focal length) and the plane of glass plate None of these
29 The Plano-convex lens used in the Newton's rings are of focal length Small Long Very large None of these
30 If the thickness of the film and angle of incidence are such that two reflected waves cancel each other the film will look Dark Bright May be partly bright None of these
31 If the two reflected waves reinforce each other then the firm as seen from the parallel beam of monochromic light will look Dark Bright Sometimes bright and dark None of these
32 In the thin film, the path difference of two reflected ray depends upon Thickness of the film Nature of the film Angle of incidence All of these
33 Colours seen on oily water surface by the incident white light is due to Diffraction Interference Refraction Reflection
34 A thin film is a transparent medium whose thickness with the wavelength of light are Not comparable Comparable Both None of these
35 If λ = 589 nm   d=1.0 mm  L=225 cm then fringe spacing ΔY is given by   1.76 mm 1.80 mm 1.37 mm 1.33 mm
36 If d = 0.25 cm   Y = 0.059 cm   L = 100 cm    m = 2 then λ is equal to 567 nm 569 nm 590 nm 596 nm
37 If 'd' 'm' and fringe spacing ΔY are known, the interference effect due to light of λ Cannot be determine Can be determined in same cases Can be determined None of these
38 How the fringe spacing varies as the separation of the slits increases Increases Decreases Increases very little None of these
39 The fringe spacing varies directly with Distance L Light of wavelength&nbsp;λ Phase coherence All of these
40 The fringe spacing in case of blue light Increases Remains the same Decreases None of these
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