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

Conventionally, all the distance p, q, f are measured from _____ of the lens:

Question # 2

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

Question # 3

Frequency of red color as compared to that of violet color is:

Question # 4

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

Question # 5

The contrast in the fringes in an interference pattern depends upon

Question # 6

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

Question # 7

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

Question # 8

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 # 9

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

Question # 10

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 # 11

To sources are said to be coherent if they have:

Question # 12

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

Question # 13

The property of light which does not change with the nature of the medium is:

Question # 14

Light waves are:

Question # 15

The distance from eye to near point is taken as:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
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 size of the image is maximum when its distance from the magnifying glass is:
A. 0.10 m
B. 0.15 m
C. 0.20 m
D. 0.25 m
4 A convex lens acts as diverging lens when the object is placed:
A. Between F and 2F
B. At 2F
C. With focal length
D. Beyond 2F
5 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:
A. 15 cm
B. 10 cm
C. 20 cm
D. 5 cm
6 The image of the tip of a needle is never sharp because of
A. Polarization of light
B. Interference of light
C. Diffraction of light
D. Reflection of light
7 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
8 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
9 A prism splits a beam of white light into seven component colors. This is so because
A. Phase of different colors is different
B. Amplitude of different colors is different
C. Wavelength of different colors is different
D. Velocity of different colors is different
10 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller

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