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

Monochromatic light means waves of:

Question # 3

Huygen principle is used to determine:

Question # 4

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

Question # 5

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

Question # 6

The velocity of light in vacuum can be changed by changing

Question # 7

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

Question # 8

The wave nature of light was proposed by:

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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 # 13

Angle between the ray of light and the corresponding wavefront is:

Question # 14

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

Question # 15

A virtual image is formed when object is placed:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 In the formula R = N x m for diffraction grating, N denotes:
A. No. of lines/cm
B. No. of lines/meter
C. Total number of lines
D. None of above
3 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
4 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
5 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
6 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
7 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
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 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
10 Speed of light in vacuum depends upon:
A. Frequency
B. Wavelength
C. Amplitude
D. None of these

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