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

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

Question # 2

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

Question # 3

The contrast in the fringes in an interference pattern depends upon

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:

Question # 8

Huygen's theory cannot explain

Question # 9

A magnifier gives an image which is:

Question # 10

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

Question # 11

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

Question # 12

For the virtual image, option _______ is not correct:

Question # 13

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

Question # 14

To observe interference of light, the condition, which must be met with is that the sources must be:

Question # 15

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:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The cause of mirage observed in deserts in bright sunlight is due to
A. Refraction of light
B. Reflection of light
C. Scattering of light
D. Total internal reflection of light
2 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
3 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
4 The magnifier forms a virtual image of the object at:
A. None of these
B. Both A and B are correct
C. Much farther than the least distance
D. Least distance of distinct vision
5 The property of light which does not change with the nature of the medium is:
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
6 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
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 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
9 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
10 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

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