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

The locus of all the points in the same phase of vibration is called:

Question # 2

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:

Question # 3

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

Question # 4

Least distance of distinct vision of an old man possibly becomes:

Question # 5

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

Question # 6

In the formula R = N x m for diffraction grating, N denotes:

Question # 7

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

Question # 8

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 # 9

In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:

Question # 10

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

Question # 11

Monochromatic light means waves of:

Question # 12

In order to get interference using two light rays

Question # 13

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 # 14

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

Question # 15

Speed of light in vacuum depends upon:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 With age, least distance of distinct vision:
A. Increases
B. Decreases
C. Is not affected
D. None is correct
2 The least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
3 If the object is situated at focus of a convex lens, then its image is formed at:
A. F
B. 2F
C. Infinity
D. None of these
4 Which one of the following phenomenon cannot be explained on the bases of Huygen's theory
A. Refraction
B. Reflection
C. Diffraction
D. Formation of spectrum
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 Laws of reflection and refraction can also be explained by:
A. Particle nature of light
B. Quantum nature of light
C. Wave nature of light
D. Complex nature of light
7 How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:
A. The upper half of the image is cut off
B. The brightness of the image is reduced
C. The brightness of the image is increased
D. No effect at all
8 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
9 Huygen's theory cannot explain
A. Diffraction
B. Interference
C. Polarization
D. Photoelectric effect
10 The velocity of light in vacuum can be changed by changing
A. Frequency
B. Amplitude
C. Wavelength
D. None of these

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