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

Huygen's theory cannot explain

Question # 2

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

Question # 3

Angle between the ray of light and the corresponding wavefront is:

Question # 4

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 # 5

The magnifier forms a virtual image of the object at:

Question # 6

The image of the tip of a needle is never sharp because of

Question # 7

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

Question # 8

Wave length of light, on the average, is given by:

Question # 9

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

Question # 10

To observe interference of light, the condition, which must be met with is that the sources must be:

Question # 11

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

Question # 12

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

Question # 13

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

Question # 14

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

Question # 15

To see the minor details of the object by microscope, it should have:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The magnifier forms a virtual image of the object at:
A. None of these
B. Both A and B are correct
C. Much farther than the least distance
D. Least distance of distinct vision
2 Light appears to travel in straight line because
A. It is not absorbed by the atmosphere
B. It is refracted by the atmosphere
C. Its wavelength is very small
D. Its velocity is very large
3 The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.
A. Equal to
B. Greater than
C. Smaller than
D. None of these
4 The magnifier forms a virtual image of the object at:
A. None of these
B. Least distance of distinct vision
C. Much farther than the least distance
D. Both A and B are correct
5 In order to get interference using two light rays
A. The sources should be monochromatic and coherent
B. The sources should have the same frequency
C. Superposition should be linear
D. All of these
6 Resolving power in mth order diffraction for grating is given by:
A. R = N x m
B. None of these
C. R = m/N
D. R = N/m
7 The cause of mirage observed in deserts in bright sunlight is due to
A. Refraction of light
B. Reflection of light
C. Scattering of light
D. Total internal reflection of light
8 Resolving power in mth order diffraction for grating is given by:
A. R = N/m
B. R = m/N
C. R = N x m
D. None of these
9 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
10 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these

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