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 principles states that:

Question # 2

A ray passing through optical center of a lens, after refraction:

Question # 3

The contrast in the fringes in an interference pattern depends upon

Question # 4

The focal length of convex lens having magnifying power of 5.55 is:

Question # 5

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

Question # 6

The wave nature of light was proposed by:

Question # 7

Monochromatic light means waves of:

Question # 8

Light appears to travel in straight line because

Question # 9

The terms phase difference and path difference are:

Question # 10

The locus of all points in a medium having same phase of vibration is called

Question # 11

When the object lies between F and 2F, the image formed by is formed at:

Question # 12

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 # 13

A grating with high resolving power can distinguish _______ difference in wavelengths :

Question # 14

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

Question # 15

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

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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 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
3 Which one of the following can act approximately as a source of monochromatic light;
A. Neon lamp
B. Fluorescent tube
C. Sodium lamp
D. None of these
4 For the virtual image, option _______ is not correct:
A. 1/p = 1/f -1/q
B. 1/f = 1/p -1/q
C. 1/p=1/p-1/f
D. 1/p=1/f+1/q
5 When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:
A. Greater, smaller
B. Smaller, smaller
C. Smaller, larger
D. Greater, larger
6 In the formula R = N x m for diffraction grating, N denotes:
A. No. of lines/cm
B. No. of lines/meter
C. Total number of lines
D. None of above
7 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
8 A ray passing through optical center of a lens, after refraction:
A. Passes through focus
B. Go deviated
C. Retraces its path
D. Both B and C
9 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:
A. 5 cm
B. 10 cm
C. 20 cm
D. 25 cm
10 To observe interference of light, the condition, which must be met with is that the sources must be:
A. Monochromatic
B. Phase coherent
C. Both of above
D. None of above

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