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

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

Question # 2

A convex lens acts as diverging lens when the object is placed:

Question # 3

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

Question # 4

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

Question # 5

With age, least distance of distinct vision:

Question # 6

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:

Question # 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:

Question # 8

A magnifier gives an image which is:

Question # 9

The terms phase difference and path difference are:

Question # 10

Light waves are:

Question # 11

Monochromatic light means waves of:

Question # 12

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

Question # 13

The wave nature of light was proposed by:

Question # 14

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

Question # 15

The contrast in the fringes in an interference pattern depends upon

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:
A. Greater than
B. Equal to
C. Smaller than
D. None of these
2 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
3 In case of point, source of light shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
4 A convex lens acts as diverging lens when the object is placed:
A. Beyond 2F
B. At 2F
C. With focal length
D. Between F and 2F
5 Least distance of distinct vision of an old man possibly becomes:
A. A little less than 25 cm
B. A little more than 25 cm
C. Much less than 25 cm
D. None of these
6 The focal length of convex lens having magnifying power of 5.55 is:
A. 5.5 cm
B. 5 cm
C. 4.5 cm
D. 6 cm
7 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
8 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
9 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
10 The ratio of the size of the image to that of object is called:
A. Focal length
B. Aperture
C. Linear magnification
D. Principal axis

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