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

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

Question # 2

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

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

Electromagnetic waves transport:

Question # 6

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

Question # 7

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

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

The locus of all the points in the same phase of vibration is called:

Question # 10

The wave nature of light was proposed by:

Question # 11

Light has:

Question # 12

The terms phase difference and path difference are:

Question # 13

The magnifier forms a virtual image of the object at:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
2 Huygen principle is used to determine:
A. Speed of light
B. Location of wavefront
C. About polarized or unpolarized light
D. None of them
3 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
4 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect
5 A convex lens acts as diverging lens when the object is placed:
A. Beyond 2F
B. At 2F
C. With focal length
D. Between F and 2F
6 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
7 Electromagnetic waves transport:
A. Energy only
B. Momentum only
C. Both A and B are correct
D. None of is correct
8 If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity
A. Fringe width will decrease
B. Fringe width will increase
C. Fringe width will remain unchanged
D. Fringe will become less intense
9 Huygen's principles states that:
A. Light has dual nature
B. Either of these
C. None of these
D. Light travels in straigth line
10 Laws of reflection and refraction can also be explained by:
A. Particle nature of light
B. Quantum nature of light
C. Wave nature of light
D. Complex nature of light

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