ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 For the virtual image, option _______ is not correct: 1/p = 1/f -1/q 1/f = 1/p -1/q 1/p=1/p-1/f 1/p=1/f+1/q
2 A ray passing through optical center of a lens, after refraction: Passes through focus Go deviated Retraces its path Both B and C
3 If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be: 5 cm 10 cm 20 cm 25 cm
4 Conventionally, all the distance p, q, f are measured from _____ of the lens: Focus Optical center Edges None of these
5 Least distance of distinct vision of an old man possibly becomes: A little less than 25 cm A little more than 25 cm Much less than 25 cm None of these
6 The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths: Greater than Less than Equal to None of these
7 If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at: 15 cm 20 cm 10 cm 5 cm
8 If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at: 5 cm 10 cm 20 cm 15 cm
9 How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper: The upper half of the image is cut off The brightness of the image is reduced The brightness of the image is increased No effect at all
10 If the object is situated at focus of a convex lens, then its image is formed at: F 2F Infinity None of these
11 When the object lies between F and 2F, the image formed by is formed at: Virtual Diminished Erect Real
12 When the object lies between F and 2F, the image formed by is formed at: Real Virtual Diminished Erect
13 A convex lens acts as diverging lens when the object is placed: Beyond 2F At 2F With focal length Between F and 2F
14 A convex lens acts as diverging lens when the object is placed: Between F and 2F At 2F With focal length Beyond 2F
15 The distance from eye to near point is taken as: 10 cm 15 cm 20 cm 25 cm
16 With age, least distance of distinct vision: Increases Decreases Is not affected None is correct
17 The least distance of distinct vision is: 10 cm 25 cm 50 cm 100 cm
18 In YDS experiment, fringe spacing means the distance between two consecutive ____fringes. Bright Dark Any of A and B None of these
19 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>
20 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
21 The terms phase difference and path difference are: Same Different Equal None of these
22 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
23 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
24 To sources are said to be coherent if they have: Same amplitude Same wavelength Definite phase relation with each other None of them
25 The appearance of the colour in the soap (oil) film results from: Dispersion Interference Reflection Refraction
26 The property of light which does not change with the nature of the medium is: Frequency Amplitude Wavelength None of these
27 A line which represents the direction of travel of a wave is known as: Spherical Wavefront Locus Ray Either B or C
28 Huygen's principles states that: Light has dual nature Either of these None of these Light travels in straigth line
29 The wave nature of light was proposed by: Newton Thomas Young Huygen None of these
30 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
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