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

Question # 2

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:

Question # 3

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

Question # 4

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

Question # 5

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

Question # 6

The magnifier forms a virtual image of the object at:

Question # 7

Speed of light in vacuum depends upon:

Question # 8

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:

Question # 9

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

Question # 10

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

Question # 11

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 # 12

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

Question # 13

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:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The image of the tip of a needle is never sharp because of
A. Polarization of light
B. Interference of light
C. Diffraction of light
D. Reflection of light
2 Light has:
A. Wave nature
B. Particle nature
C. Dual nature
D. None of these
3 In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:
A. Greater than
B. Smaller than
C. Equal to
D. None of these
4 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
5 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these
6 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
7 Huygen's principles states that:
A. Light has dual nature
B. Either of these
C. None of these
D. Light travels in straigth line
8 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:
A. 6 x 10-5rad
B. 7 x 10-5rad
C. 8 x 10-5rad
D. None of these
9 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these
10 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

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