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 contrast in the fringes in an interference pattern depends upon

Question # 2

A virtual image is formed when object is placed:

Question # 3

Electromagnetic waves transport:

Question # 4

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

Question # 5

The wave nature of light was proposed by:

Question # 6

The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:

Question # 7

Monochromatic light means waves of:

Question # 8

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

Question # 9

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 # 10

Which one of the following can act approximately as a source of monochromatic light;

Question # 11

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

Question # 12

The magnifier forms a virtual image of the object at:

Question # 13

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 # 14

A line which represents the direction of travel of a wave is known as:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 With age, least distance of distinct vision:
A. Increases
B. Decreases
C. Is not affected
D. None is correct
2 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
3 The distance from eye to near point is taken as:
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
4 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
5 How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:
A. The upper half of the image is cut off
B. The brightness of the image is reduced
C. The brightness of the image is increased
D. No effect at all
6 Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?
A. Gamma rays, micro waves, visible light
B. Radio waves, ultraviolet waves, X-rays
C. Ultraviolet rays, infrared rays, micro waves
D. Visible light, gamma rays, radio waves
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 least distance of distinct vision is:
A. 10 cm
B. 25 cm
C. 50 cm
D. 100 cm
9 A virtual image is formed when object is placed:
A. Within focal length of a convex lens
B. Near the focal point of a concave lens
C. Both A and B
D. Away from 2F of a convex lens
10 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

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