ECAT Pre General Science Physics Chapter 10 Optical Instruments Online Test With Answers

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ECAT Pre General Science Physics Chapter 10 Optical Instruments Online Test

Sr. # Questions Answers Choice
1 In YDS experiment, fringe spacing means the distance between two consecutive _________ fringes Bright Dark Any of A or B None of these
2 In an interference pattern of Young's Double Slit (YDS) experiment Bright fringes are wider than dark fringes Dark fringes are wider than bright fringes Both dark and bright fringes are of equal width Central fringes are wider than the outer fringes
3 In case of constructive interference of two waves, the amplitude of the resultant wave is __________ either of the waves Greater than Equal to Smaller than None of these
4 The terms phase difference and path difference are Same Different Equal none of these
5 In case of destructive interference of two waves, the amplitude of the resultant wave will be __________ either of the waves. Greater than Smaller than Equal to None of these
6 To observe interference of light, the condition, which must be met with is that the sources must be Monochromatic Phase coherent Both of above None of above
7 Two sources are said to be coherent if they have Same amplitude Same wavelength Definite phase relation with each other None of them
8 The appearance of colours in the soap (or oil) film results from Dispersion Interference Reflection Refraction
9 The appearance of colours in the soap (or oil) film results from Dispersion Interference Reflection Refraction
10 The property of light which does not change with the nature of the medium is Frequency Amplitude Wavelength None of these
11 A line which represents the direction of travel of a wave is known as Spherical wavefront Locus Ray Either B or C
12 Huygen's principle states that Light travels in straight line Light has dual nature Either of these None of these
13 The wave nature of light was proposed by Newton Thomas Young Huygen None of these
14 Laws of reflection and refraction can also be explained by Particle nature of light Quantum nature of light Wave nature of light Complex nature of light
15 The speed of the secondary wavelets as mentioned in Huygen's principle is ________ the speed of propagation of the wave itself Equal to Greater than Smaller than None of these
16 When the source of light is at very large distance, the shape of wavefront is Spherical Cylindrical Plane None of these
17 Speed of light in vacuum depends upon Frequency Wavelength Amplitude None of these
18 In case of point source of light, shape of wavefront is Spherical Cylindrical Plane None of above
19 Huygen principle is used to determine Speed of light Location of wavefront About polarized and unpolarized light None of them
20 Angle between ray of light and the corresponding wavefront is 0<sup>0</sup> 60<sup>0</sup> 90<sup>0</sup> 120<sup>0</sup>
21 The locus of all the points in the same phase of vibration is called Wave pocket Wavefront Wave number None of these
22 Monochromatic light means wave of Same frequency Same colour Same Wavelength All of them
23 Frequency of red colour as compared to that of violet colour is Equal Smaller Greater None of these
24 Wavelength of red colour as compared to that of violet colour is Smaller Longer Equal None of these
25 Which one of the followings can act approximately as a source of monochromatic light Neon lamp Fluorescent tube Sodium lamp None of these
26 Light waves are Mechanical waves Electromagnetic waves Any of above None of above
27 Electromagnetic waves transport Energy only Momentum only Both A and B None is correct
28 Wavelength of light, on the average, is given by 10<sup>-14</sup>m 10<sup>-10</sup>m 10<sup>-6</sup>m 10<sup>-4</sup>m
29 Light waves are Transverse waves Longitudinal waves Compressional None of them wave
30 Light has Wave nature Dual nature Particle nature None of them
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