ECAT Pre Computer Science Chapter 9 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 9 Physical Optics

Try The MCQ's Test For ECAT Physics Chapter 9 Physical Optics

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ECAT Physics Chapter 9 Physical Optics

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Question # 1

If the object is situated at focus of a convex lens, then its image is formed at:

Question # 2

The least distance of distinct vision is:

Question # 3

If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:

Question # 4

The appearance of the colour in the soap (oil) film results from:

Question # 5

Wave length of that color as compared to that of violet color is:

Question # 6

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

Question # 7

The magnifier forms a virtual image of the object at:

Question # 8

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

Question # 9

In order to get interference using two light rays

Question # 10

When a source of light isat very large distance,the shape of wavefront is:

Question # 11

Laws of reflection and refraction can also be explained by:

Question # 12

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:

Question # 13

The magnifier forms a virtual image of the object at:

Question # 14

The cause of mirage observed in deserts in bright sunlight is due to

Question # 15

The ratio of the size of the image to that of object is called:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 In case of point, source of light shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
2 Speed of light in vacuum depends upon:
A. Frequency
B. Wavelength
C. Amplitude
D. None of these
3 With age, least distance of distinct vision:
A. Increases
B. Decreases
C. Is not affected
D. None is correct
4 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
5 To sources are said to be coherent if they have:
A. Same amplitude
B. Same wavelength
C. Definite phase relation with each other
D. None of them
6 Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:
A. 6 x 10-5rad
B. 7 x 10-5rad
C. 8 x 10-5rad
D. None of these
7 Stars twinkle due to
A. The fact that they do not emit light continuously
B. The refractive index of earth's atmosphere fluctuates
C. The Star's atmosphere absorbs its light intermittently
D. None of these
8 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these
9 The contrast in the fringes in an interference pattern depends upon
A. Fringe width
B. Relative difference intensities of the two sources
C. Distance between the slits
D. Wavelength
10 Angle between the ray of light and the corresponding wavefront is:
A. 0°
B. 60°
C. 90°
D. 120°

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