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

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

Question # 2

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

Question # 3

The appearance of the colour in the soap (oil) film results from:

Question # 4

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

Question # 5

The image of the tip of a needle is never sharp because of

Question # 6

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 # 7

Speed of light in vacuum depends upon:

Question # 8

The magnifier forms a virtual image of the object at:

Question # 9

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

Question # 10

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

Question # 11

Laws of reflection and refraction can also be explained by:

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Light waves are:
A. Transverse wave
B. Longitudinal wave
C. Compressional wave
D. None of them
2 A prism splits a beam of white light into seven component colors. This is so because
A. Phase of different colors is different
B. Amplitude of different colors is different
C. Wavelength of different colors is different
D. Velocity of different colors is different
3 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
4 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
5 Resolving power in mth order diffraction for grating is given by:
A. R = N x m
B. None of these
C. R = m/N
D. R = N/m
6 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
7 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
8 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
9 Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?
A. Gamma rays, micro waves, visible light
B. Radio waves, ultraviolet waves, X-rays
C. Ultraviolet rays, infrared rays, micro waves
D. Visible light, gamma rays, radio waves
10 The ratio of the size of the image to that of object is called:
A. Focal length
B. Aperture
C. Linear magnification
D. Principal axis

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