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

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 # 2

A line which represents the direction of travel of a wave is known as:

Question # 3

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

Question # 4

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

Question # 5

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

Question # 6

Light appears to travel in straight line because

Question # 7

The contrast in the fringes in an interference pattern depends upon

Question # 8

A virtual image is formed when object is placed:

Question # 9

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

Question # 10

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

Question # 11

Huygen principle is used to determine:

Question # 12

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

Question # 13

Laws of reflection and refraction can also be explained by:

Question # 14

With age, least distance of distinct vision:

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 focal length of convex lens having magnifying power of 5.55 is:
A. 5.5 cm
B. 5 cm
C. 4.5 cm
D. 6 cm
2 In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.
A. Bright
B. Dark
C. Any of A and B
D. None of these
3 Frequency of red color as compared to that of violet color is:
A. Equal
B. Smaller
C. Greater
D. None of these
4 Speed of light in vacuum depends upon:
A. Frequency
B. Wavelength
C. Amplitude
D. None of these
5 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
6 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
7 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these
8 The locus of all the points in the same phase of vibration is called:
A. Wave packet
B. Wave front
C. Wave number
D. None of them
9 Light appears to travel in straight line because
A. It is not absorbed by the atmosphere
B. It is refracted by the atmosphere
C. Its wavelength is very small
D. Its velocity is very large
10 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:
A. 5 cm
B. 10 cm
C. 20 cm
D. 25 cm

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