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

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

Question # 2

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

Question # 3

Stars twinkle due to

Question # 4

The contrast in the fringes in an interference pattern depends upon

Question # 5

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

Question # 6

With age, least distance of distinct vision:

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

In an interference pattern of Young's double slit(YDS) experiment:

Question # 12

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

Question # 13

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

Question # 14

When a source of light isat very large distance,the shape of wavefront is:

Question # 15

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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:
A. 15 cm
B. 10 cm
C. 20 cm
D. 5 cm
2 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
3 Laws of reflection and refraction can also be explained by:
A. Particle nature of light
B. Quantum nature of light
C. Wave nature of light
D. Complex nature of light
4 When the object lies between F and 2F, the image formed by is formed at:
A. Virtual
B. Diminished
C. Erect
D. Real
5 A line which represents the direction of travel of a wave is known as:
A. Spherical Wavefront
B. Locus
C. Ray
D. Either B or C
6 In an interference pattern of Young's double slit(YDS) experiment:
A. Bright fringesare wider than dark fringes
B. Dark fringes are wider than bright fringes
C. Both dark and bright fringes are of equal width
D.

Central fringes are wider than the outer fringes
7 Speed of light in vacuum depends upon:
A. Frequency
B. Wavelength
C. Amplitude
D. None of these
8 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
9 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
10 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these

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