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

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

Question # 2

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

Question # 3

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

Question # 4

According to Huygen's principle

Question # 5

A virtual image is formed when object is placed:

Question # 6

The contrast in the fringes in an interference pattern depends upon

Question # 7

The velocity of light in vacuum can be changed by changing

Question # 8

Laws of reflection and refraction can also be explained by:

Question # 9

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

Question # 10

The distance from eye to near point is taken as:

Question # 11

Light has:

Question # 12

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:

Question # 13

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

Question # 14

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

Question # 15

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

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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 Wave length of that color as compared to that of violet color is:
A. Smaller
B. Longer
C. Equal
D. None of these
3 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:
A. 6 x 10-5rad
B. 7 x 10-5rad
C. 8 x 10-5rad
D. None of these
4 When a source of light isat very large distance,the shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
5 How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:
A. The upper half of the image is cut off
B. The brightness of the image is reduced
C. The brightness of the image is increased
D. No effect at all
6 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
7 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:
A. 5 cm
B. 20 cm
C. 10 cm
D. 15 cm
8 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
9 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
10 The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these

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