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

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

Question # 2

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

Question # 3

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

Question # 4

If the object is situated at focus of a convex lens, then its image is formed at:

Question # 5

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

Question # 6

Light appears to travel in straight line because

Question # 7

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

Question # 8

Huygen's theory cannot explain

Question # 9

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

Question # 10

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 # 11

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

Question # 12

A magnifier gives an image which is:

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 A ray passing through optical center of a lens, after refraction:
A. Passes through focus
B. Go deviated
C. Retraces its path
D. Both B and C
2 A magnifier gives an image which is:
A. Virtual, inverted
B. Real, erect
C. Virtual, erect
D. Real, inverted
3 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
4 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
5 According to Huygen's principle
A. light travels in straight line
B. Light is a transvers wave
C. Light has dual nature
D. All points on the primary wave-front are the sources of secondary wavelets
6 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
7 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
8 The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:
A. Greater than
B. Less than
C. Equal to
D. None of these
9 In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:
A. Greater than
B. Equal to
C. Smaller than
D. None of these
10 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

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