ECAT Physics Chapter 9 Physical Optics Online Test With Answers

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ECAT Physics Chapter 9 Physical Optics Online Test

Sr. # Questions Answers Choice
1 A convex lens acts as diverging lens when the object is placed: Between F and 2F At 2F With focal length Beyond 2F
2 The distance from eye to near point is taken as: 10 cm 15 cm 20 cm 25 cm
3 With age, least distance of distinct vision: Increases Decreases Is not affected None is correct
4 The least distance of distinct vision is: 10 cm 25 cm 50 cm 100 cm
5 In YDS experiment, fringe spacing means the distance between two consecutive ____fringes. Bright Dark Any of A and B None of these
6 In an interference pattern of Young's double slit(YDS) experiment: Bright fringesare wider than dark fringes Dark fringes are wider than bright fringes Both dark and bright fringes are of equal width <div><br></div><div>Central fringes are wider than the outer fringes</div>
7 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
8 The terms phase difference and path difference are: Same Different Equal None of these
9 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
10 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
11 To sources are said to be coherent if they have: Same amplitude Same wavelength Definite phase relation with each other None of them
12 The appearance of the colour in the soap (oil) film results from: Dispersion Interference Reflection Refraction
13 The property of light which does not change with the nature of the medium is: Frequency Amplitude Wavelength None of these
14 A line which represents the direction of travel of a wave is known as: Spherical Wavefront Locus Ray Either B or C
15 Huygen's principles states that: Light has dual nature Either of these None of these Light travels in straigth line
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