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

Light waves are:

Question # 2

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

Question # 3

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

Question # 4

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 # 5

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

Question # 6

Huygen principle is used to determine:

Question # 7

The locus of all the points in the same phase of vibration is called:

Question # 8

Monochromatic light means waves of:

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

Question # 13

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

Question # 14

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

Question # 15

In order to get interference using two light rays

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 In case of point, source of light shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
3 Monochromatic light means waves of:
A. Same frequency
B. Same colour
C. Same wavelength
D. All of them
4 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
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 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
7 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these
8 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:
A. Double the size
B. Same size
C. Half the size
D. None of these
9 If the object is situated at focus of a convex lens, then its image is formed at:
A. F
B. 2F
C. Infinity
D. None of these
10 A convex lens acts as diverging lens when the object is placed:
A. Beyond 2F
B. At 2F
C. With focal length
D. Between F and 2F

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