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

Huygen principle is used to determine:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

To observe interference of light, the condition, which must be met with is that the sources must be:

Question # 7

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

Question # 8

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

Question # 9

To see the minor details of the object by microscope, it should have:

Question # 10

The magnifier forms a virtual image of the object at:

Question # 11

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 # 12

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

Question # 13

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

Question # 14

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

Question # 15

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:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 A magnifier gives an image which is:
A. Virtual, inverted
B. Real, erect
C. Virtual, erect
D. Real, inverted
3 When the object lies between F and 2F, the image formed by is formed at:
A. Virtual
B. Diminished
C. Erect
D. Real
4 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
5 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
6 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
7 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
8 If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity
A. Fringe width will decrease
B. Fringe width will increase
C. Fringe width will remain unchanged
D. Fringe will become less intense
9 To sources are said to be coherent if they have:
A. Same amplitude
B. Same wavelength
C. Definite phase relation with each other
D. None of them
10 With age, least distance of distinct vision:
A. Increases
B. Decreases
C. Is not affected
D. None is correct

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