ECAT Pre General Science Physics Chapter 9 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 9 Physical Optics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 9 Physical Optics

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ECAT Pre General Science Physics Chapter 9 Physical Optics

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Question # 1

The least distance of distinct vision is:

Question # 2

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 # 3

A prism splits a beam of white light into seven component colors. This is so because

Question # 4

A ray passing through optical center of a lens, after refraction:

Question # 5

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 # 6

Huygen's principles states that:

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

In order to get interference using two light rays

Question # 9

Speed of light in vacuum depends upon:

Question # 10

Conventionally, all the distance p, q, f are measured from _____ of the lens:

Question # 11

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

Question # 12

The image of the tip of a needle is never sharp because of

Question # 13

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

Question # 14

A virtual image is formed when object is placed:

Question # 15

Which one of the following can act approximately as a source of monochromatic light;

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
A. 1
B. 0.2
C. 2
D. 0.1
2 The terms phase difference and path difference are:
A. Same
B. Different
C. Equal
D. None of these
3 The magnifier forms a virtual image of the object at:
A. None of these
B. Least distance of distinct vision
C. Much farther than the least distance
D. Both A and B are correct
4 The contrast in the fringes in an interference pattern depends upon
A. Fringe width
B. Relative difference intensities of the two sources
C. Distance between the slits
D. Wavelength
5 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
6 If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:
A. Double the size
B. Same size
C. Half the size
D. None of these
7 In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:
A. Greater than
B. Smaller than
C. Equal to
D. None of these
8 If the object is situated at focus of a convex lens, then its image is formed at:
A. F
B. 2F
C. Infinity
D. None of these
9 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
10 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

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