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 terms phase difference and path difference are:

Question # 2

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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 # 7

Laws of reflection and refraction can also be explained by:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

In case of point, source of light shape of wavefront is:

Question # 12

Resolving power in mth order diffraction for grating is given by:

Question # 13

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 # 14

Light has:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
A. 1
B. 0.2
C. 2
D. 0.1
2 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
3 The property of light which does not change with the nature of the medium is:
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
4 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
5 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None 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 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
8 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
9 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
10 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

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