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

Wave length of that color as compared to that of violet color is:

Question # 2

The magnifier forms a virtual image of the object at:

Question # 3

Electromagnetic waves transport:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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 # 8

Stars twinkle due to

Question # 9

The wave nature of light was proposed by:

Question # 10

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

Question # 11

A virtual image is formed when object is placed:

Question # 12

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

Question # 13

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

Question # 14

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:

Question # 15

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

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 Huygen's principles states that:
A. Light has dual nature
B. Either of these
C. None of these
D. Light travels in straigth line
2 According to Huygen's principle
A. light travels in straight line
B. Light is a transvers wave
C. Light has dual nature
D. All points on the primary wave-front are the sources of secondary wavelets
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 The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.
A. Equal to
B. Greater than
C. Smaller than
D. None of these
5 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
6 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
7 In an interference pattern of Young's double slit(YDS) experiment:
A. Bright fringesare wider than dark fringes
B. Dark fringes are wider than bright fringes
C. Both dark and bright fringes are of equal width
D.

Central fringes are wider than the outer fringes
8 The appearance of the colour in the soap (oil) film results from:
A. Dispersion
B. Interference
C. Reflection
D. Refraction
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 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

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