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

The magnifier forms a virtual image of the object at:

Question # 2

To see the minor details of the object by microscope, it should have:

Question # 3

The contrast in the fringes in an interference pattern depends upon

Question # 4

If the object is situated at focus of a convex lens, then its image is formed at:

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

Question # 7

Huygen's principles states that:

Question # 8

The distance from eye to near point is taken as:

Question # 9

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

Question # 10

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

Question # 11

A magnifier gives an image which is:

Question # 12

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

Question # 13

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

Question # 14

Frequency of red color as compared to that of violet color is:

Question # 15

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:

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ECAT Physics Chapter 9 Important MCQ's

Sr.# Question Answer
1 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
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 The property of light which does not change with the nature of the medium is:
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
4 The locus of all the points in the same phase of vibration is called:
A. Wave packet
B. Wave front
C. Wave number
D. None of them
5 In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:
A. Greater than
B. Equal to
C. Smaller than
D. None of these
6 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
7 Huygen's principles states that:
A. Light has dual nature
B. Either of these
C. None of these
D. Light travels in straigth line
8 In case of point, source of light shape of wavefront is:
A. Spherical
B. Cylindrical
C. Plane
D. None of these
9 A grating with high resolving power can distinguish _______ difference in wavelengths :
A. Smaller
B. Larger
C. Zero
D. None of these
10 When the object lies between F and 2F, the image formed by is formed at:
A. Real
B. Virtual
C. Diminished
D. Erect

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