ECAT Pre Engineering Physics Chapter 9 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 9 Physical Optics

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Physics ECAT Pre Engineering 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

Stars twinkle due to

Question # 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:

Question # 4

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

Question # 5

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

Question # 6

In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.

Question # 7

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

Question # 8

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

Question # 9

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

Question # 10

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

Question # 11

The size of the image is maximum when its distance from the magnifying glass is:

Question # 12

The property of light which does not change with the nature of the medium is:

Question # 13

Monochromatic light means waves of:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 In order to get interference using two light rays
A. The sources should be monochromatic and coherent
B. The sources should have the same frequency
C. Superposition should be linear
D. All of these
2 The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:
A. Greater than
B. Less than
C. Equal to
D. None of these
3 The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
A. 1
B. 0.2
C. 2
D. 0.1
4 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Larger
B. Zero
C. None of these
D. Smaller
5 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
6 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
7 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
8 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
9 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
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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