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

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

Question # 2

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

Question # 3

The appearance of the colour in the soap (oil) film results from:

Question # 4

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

Question # 5

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

Question # 6

The magnifier forms a virtual image of the object at:

Question # 7

The focal length of convex lens having magnifying power of 5.55 is:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

The velocity of light in vacuum can be changed by changing

Question # 13

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

Question # 14

A magnifier gives an image which is:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Wave length of light, on the average, is given by:
A. 10-14m
B. 10-10m
C. 10-6m
D. 10-4m
2 Conventionally, all the distance p, q, f are measured from _____ of the lens:
A. Focus
B. Optical center
C. Edges
D. None of these
3 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
4 Which one of the following phenomenon cannot be explained on the bases of Huygen's theory
A. Refraction
B. Reflection
C. Diffraction
D. Formation of spectrum
5 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these
6 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
7 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
8 To see the minor details of the object by microscope, it should have:
A. High magnifying power
B. High resolving power
C. Am objective of larger focal length
D. None of these
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 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

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